We can represent atoms by listing the number of protons, neutrons, and electrons-for example, 2p⁺, 2n⁰, 2e⁻ for helium. Which of the following represents the ¹⁸O isotope of oxygen? a. 7p⁺, 2n⁰, 9 e⁻ b. 8p⁺, 10n⁰, 8 e⁻ c. 9p⁺, 9n⁰, 9 e⁻ d. 10p⁺, 8 n⁰, 9 e⁻
Answers
We can represent the number of electron, protons and neutrons in O18 isotope of oxygen as 8p+, 10n0, 8e-.
Isotopes are the elements that have same number of electrons and protons but different number of neutrons. For example oxygen have three isotopes three isotopes O18, O17, and O16. Each of the isotope have same number of electrons and protons i.e. 8 but have eight, nine and ten neutrons.
The number of electron and protons are always equal in an atom. So the number of neutrons can be found out by subtracting the atomic mass with the number of protons or electrons.
Hence the option 8p+, 10n0, 8e- is the correct option.
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Related Questions
All human beings differ from one another by roughly what percentage of their total DNA?
Answers
Answer:
All human beings are 99.9 percent identical in their genetic makeup. Differences in the remaining 0.1 percent hold important clues about the causes of diseases.
True or False
inherited genetic variations are caused and influenced by environmental factors only
Answers
Answer:
False, it can also be caused by mutations.
How are eukaryotic genes regulated?.
Answers
By repressors as well as by transcriptional activators.
How will the movement of substances be altered in the phloem during spring season? Why?
Answers
Answer:
The phloem is responsible for transporting food from leaves to other parts of the plant.
The transport of pholem is bidirectional and changes the movement of particles according to the season. Generally, the transportation occurs in the direction of the source to sink but in spring season the direction is opposite that is from sink to source because the source and sink are n opposite sides. So in spring season, the stem tubers are sources and the growing leaves are sinks.
Which of the following is not true about plasma?
A. It is the most abundant state of matter in the universe
B. It is created at very low temperatures
C. It is made up of charges particles
D. It can generate magnetic fields
Answers
Answer:
B. It is created at very low temperatures
Explanation:
True or false? In size exclusion chromatography, the smallest proteins are eluted last.
Answers
The statement is true. Size exclusion chromatography is a type of liquid chromatography that separates molecules based on their size.
The statement is true. Size exclusion chromatography is a type of liquid chromatography that separates molecules based on their size. It works by using a porous stationary phase that allows molecules to pass through its pores based on their size. The larger molecules elute first as they are unable to enter the pores, while smaller molecules enter the pores and elute later. Therefore, the smallest proteins will be eluted last in size exclusion chromatography.
Size exclusion chromatography is a valuable tool for protein purification and characterization. It is often used to separate protein mixtures based on their molecular weight or size, which is critical for downstream analysis. This technique is also used to remove aggregates and impurities from protein samples, which can improve the quality of the final product. Size exclusion chromatography is a versatile and widely used method for protein separation and purification.
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#7 A cuckoo bird lays its eggs in a warbler bird's nest. Once hatched, the cuckoo chicks displace the warbler chicks, tricking the parent warbler into caring for them over their own young. What type of ecological interaction does the cuckoo have with the warbler?
a. Commensalism
b. Competition
c. Mutualism
d. Parasitism
Answers
Answer:
Parasitism
Explanation:
Parasitism is a kind of interaction between organisms in which only one organism gains from the interaction. Usually one organism gains at the expense of the other organism.
In this case, the cuckoo bird gains at the expense of the warbler bird. The cuckoo bird lays its eggs in the warbler bird nest and also tricks the warbler bird to care for its young at the expense of the warbler bird's young.
This is parasitism.
Answer:
Parasitism
Explanation:
This type of relationship is the brood parasitism, a clear example of the parasite-host relationship. Instead of building their own nest for their living, the cuckoo will lay their eggs in what is known as reed warbler’s nest. This leaves the warbler to take care of the egg together with her own children. When the eggs get hatched, the chick of the cuckoo will then ejects the young of the warbler from the next, which paves way for it to get all the food that its adopted mother will provide.
List differences of a human digestive system and a frogs digestive system
Answers
The following are the differences of human and frog digestive systems:
1. Humans possess stable teeth which they use for chewing while frogs do not possess stable teeth to grip their prey.
2. Chewing for humans is an automatic digestion while frogs do not chew their prey but swallow it instead.
3. Humans possess only a set of teeth while frogs possess two sets of teeth.
4. Human's tongue is inclined behind the mouth while the frog's tongue is inclined to the opening of the mouth.
5. Humans possess a lengthy small intestine while the frog possess a more concise small intestine.
6. The expulsion of undigested food in human is through the rectum while in frog, it is through the cloaca.
what are the 3 categories of muscles?
Answers
Answer:
The 3 types of muscle tissue are cardiac, smooth, and skeletal. Cardiac muscle cells are located in the walls of the heart, appear striated, and are under involuntary control.
Which of the statements is true regarding glycine? R=H a. Glycine is a polar amino acid. b. Glycine is a large amino acid. c. Glycine is an asymmetric amino acid.
d. Glycine increases the flexibility of the peptide backbone.
Answers
It is true that glycine makes the peptide backbone more flexible.
In addition to its multiple functions as an antioxidant, anti-inflammatory, cryoprotective, and immunomodulatory substance in peripheral and neurological tissues, glycine functions as a neurotransmitter in the central nervous system. Schizophrenia, stroke, benign prostatic hyperplasia (BPH), and several uncommon inherited metabolic disorders are all treated with glycine.
Additionally, it is used to shield the liver from the damaging effects of alcohol and the kidneys from the detrimental side effects of several medications used following organ transplantation. Glycine is an amino acid that supports cellular development and health. One of the amino acids necessary for the body to produce the antioxidant glutathione is glycine. In order to combat free radicals, which can otherwise lead to oxidative stress and harm cells, proteins, and DNA, cells create glutathione.
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Which phrase best characterizes diffusion and osmosis?
A. movement of particles from a region of low concentration to a region of high concentration
B. active transport of particles up a concentration gradient
C. passive transport of particles down a concentration gradient
D. movement through a cell membrane using ATP
Answers
Answer:
B.
Explanation:
Believe me it’s B.
In order to safely bring the fossilized remains of a yeti down the side of a snowy mountain, they are strapped to a sled - the combination of which weighs 972 N - then carefully lowered down the 19.8∘ incline. To ensure the fossil is not damaged, it is brought down the snowy slope at a constant 1.92 m/s Although the runners of the sled are smooth, they are not free of friction; the coefficient of kinetic friction between the runners and the snow is 0.107. Assuming the rope is kept taut and parallel to the incline, what must be the tension (in newtons) in it
Answers
The tension in the rope is calculated as 33.7 N.
Weight of sled and fossil, w = 972 N Inclination angle of slope, θ = 19.8°
Speed of sled, v = 1.92 m/s
Coefficient of kinetic friction between sled runners and snow, μ = 0.107
To find:
Tension in the rope, T The forces acting on the sled are the gravitational force (Fg), the normal force (Fn) and the force of friction (Ff). The normal force is perpendicular to the slope and equal to the component of the gravitational force perpendicular to the slope. The force of friction is parallel to the slope and opposite the direction of motion.
The net force acting on the sled is given by the expression:
F net = ma
Since the sled moves with constant velocity, a = 0.
Therefore, F net = 0. F net = Fg sinθ - Ff = 0⇒ Fg sinθ = Ff
Since the speed of sled is constant, work done by tension in the rope is equal to work done by frictional force.
Hence, T = Ff = μFn
Where F n = Fg cosθ = w cosθ
Putting all the values,
T = μw cos θ sinθ= sin 19.8°cos 19.8°= 0.3365T = 0.107 × 972 × 0.3365T = 33.7 N
The rope is 33.7 N. The given problem is related to the tension in the rope. The tension in the rope is calculated as 33.7 N.
To bring down the fossil safely down the slope, the tension in the rope is 33.7 N. The gravitational force is acting perpendicular to the slope and the force of friction is acting parallel to the slope. The normal force is the component of gravitational force acting perpendicular to the slope. The sled moves down the slope with a constant velocity. The force acting on the sled is equal and opposite to the force of tension in the rope. The force of friction is given by the expression,
Ff = μFn,
where Fn = Fg cosθ = w cosθ.
Therefore, the tension in the rope is calculated as 33.7 N.
To bring down the fossil safely down the slope, the tension in the rope must be 33.7 N.
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Which is a use for peat moss?
A. purifying water
B. putting out fires
C. providing fuel
D. curing blurred vision
Answers
Answer:
d
Explanation:
Peat moss is used for purifying water. So, the correct option is (A).
What is Peat moss?Peat moss is defined as the dark brown fibrous product of sphagnum moss and other organic materials that decompose in peat bogs over thousands of years.
Peat is described as a product created from organic matter that sinks into bogs which can be made of various materials, but a large percentage of harvested peat is made up of sphagnum moss, hence the name peat moss.
Almost any potted plant we can buy in a soil mix contains peat moss, and so do most bagged potting soils where we can even buy it to mix into our potting soil mix.
Thus, Peat moss is used for purifying water. So, the correct option is (A).
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Please help!!! Need the answerr
Answers
Answer:
C
Explanation:
Mined materials are used for different purposes
Mining is the process of removing valuable materials from the Earth's surface, including the oceans, hence option C is correct.
What is mining?Extraction of useful materials from the ground is known as mining. A few notable exceptions, a mineral is an inorganic substance found in nature that has a unique chemical composition, physical characteristics, or molecular structure.
Mined materials include coal, gemstones, and iron ore, to name a few. The raw substance used to make iron is called iron ore. Mining has existed since the primordial era.
In essence, it is the procedure used to extract valuable information from large amounts of data or data warehouses.
It is clear that the phrase itself is a little ambiguous. Coal or diamonds are the end product of the extraction process in the instance of mining for coal or diamonds.
Therefore, humans mine materials for different purpose.
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In the 1940s and 1950s, Dr Barbara McClintock studied mosaic colour patterns in corn and discovered their unstable inheritance and the underlying mechanisms. In 1983 she was awarded the Nobel Prize in Physiology/Medicine for her discovery, and is now considered one of the most influential geneticists of the 20th century. (a) Name two synonymous names for the genetic elements that Dr McClintock discovered
(b) What can these genetic elements do, and what can the consequences be for a gene and for a host genome?
(c) Which gene function do these elements require for their activity, and what are the two classes that these elements can be assigned to, and how do these two classes function in a host genome? (d) Why did Dr McClintock initially find resistance to publish her findings and in the scientific community, to the point that she did not publish these for 20 years, and why were her ground-breaking research findings a paradigm shift in the end?
Answers
They are known by two synonymous names: transposable elements or transposons. These elements can move within a genome and have various consequences for a gene and the host genome.
(a) The two synonymous names for the genetic elements discovered by Dr. McClintock are transposable elements and transposons. These terms refer to segments of DNA that have the ability to move or transpose within a genome.
(b) Transposable elements can have various effects on genes and the host genome. They can insert themselves into a gene, disrupting its function and causing mutations. They can also influence gene expression by inserting near regulatory regions, affecting the level of gene activity. Additionally, transposable elements can cause genomic rearrangements, such as duplications, deletions, or inversions, altering the structure of the genome.
(c) The activity of transposable elements requires specific genes called transposase genes. Transposase enzymes catalyze the movement of transposable elements within the genome. Transposable elements can be classified into two main classes: Class I retrotransposons and Class II DNA transposons. Class I retrotransposons transpose via a copy-and-paste mechanism, where the element is first transcribed into RNA, then reverse transcribed back into DNA and inserted at a new location. Class II DNA transposons, on the other hand, move through a cut-and-paste mechanism, directly excising from one genomic location and reinserting into another.
(d) Dr. McClintock initially faced resistance and skepticism from the scientific community, which led her to withhold publishing her findings for nearly 20 years. At the time, the prevailing belief was that genes were fixed entities with stable positions in the genome. Dr. McClintock's discovery of mobile genetic elements challenged this view and was initially met with skepticism.
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estimating the size of populations with high risk for hiv using the network scale-up method paniotto
Answers
The Network Scale-Up Method (NSUM) is a statistical technique used to estimate the size of hidden or hard-to-reach populations by leveraging social network data.
NSUM has been applied in various contexts, including estimating the size of populations at high risk for HIV. To estimate the size of populations with a high risk for HIV using the Network Scale-Up Method, here is a general outline of the process:
Identify a representative sample: Select a sample of individuals who are knowledgeable about the target population or have social connections with individuals within that population. This sample should be diverse and reflective of the larger population of interest.Develop survey questions: Create a set of survey questions that are designed to elicit information about the number of individuals known within different social networks, including the target population. These questions should capture the size and characteristics of the networks.Conduct the survey: Administer the survey to the selected sample. Ensure that respondents understand the purpose and importance of providing accurate information about their social networks.Analyze the data: Use statistical techniques to analyze the survey data and estimate the size of the target population. The NSUM typically involves calculating an average personal network size and applying it to the respondent's knowledge of individuals within the target population.Validate the estimates: Validate the estimates obtained through the NSUM by comparing them with other data sources or established population estimates, if available. This helps ensure the accuracy and reliability of the estimates.Interpret the results: Interpret the estimated population size while considering the limitations and assumptions of the NSUM. Understand that the estimates are subject to certain biases, such as underreporting or overestimation, and may not capture the entire population size accurately.Learn more about statistical techniques here:
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YALL THIS IS SO FREAKING HARD
WHAT DAY IS IT?
Answers
Answer:
Today is Monday, November 16, 2020.
It can be written as 11/16/2020 or 11/16/20.
It is the 321st day of the year out of 365 days.
How does the body obtain more glucose, if it is needed for cell respiration?
Answers
Through the process of cellular respiration, the energy in food is changed into energy that can be used by the body's cells. Initially, the sugars in the food you eat are digested into the simple sugar glucose, a . The varying glucose concentration affects the rate of cellular respiration as all living cells require both glucose and oxygen for their proper functioning. If the cell has a low level of glucose, then it cannot produce the energy -ATP molecules.
monosaccharide means any of the class of sugars (e.g., glucose) that cannot be hydrolyzed to give a simpler sugar.
Why can't non vascular plant be larger?
Answers
Answer:
They have no tissue for carrying materials throughout the plant. They absorb water and nutrients from their surroundings. Non-Vascular plants cannot grow very tall and because of their small sizes they can absorb enough water to carry materials throughout the plant.
Answer:
They have no tissue for carrying materials throughout the plant. They absorb water and nutrients from their surroundings. Non-Vascular plants cannot grow very tall and because of their small sizes they can absorb enough water to carry materials throughout the plant.

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Vascular .VS. Nonvascular
In a genetic bottleneck, ________ ________ is altered, due to a catastrophic event.
Answers
Answer:
genotype variation
Explanation:
Under what ethical framework does the statement fall that which is ethical is that which has good consequences?
Answers
According to the ethical philosophy of consequentialism, actions are determined to be right or wrong based on their effects. For instance, the majority of individuals concur that lying is unacceptable.
What is the foundation for ethical questions?Perspectives called ethical frameworks are helpful for debating what course of action might result in the greatest moral end. Many times, a person will act on instinct alone rather than using logic to determine what is best at the moment.What are the five ethical frameworks?Sources for Ethical Standards: Five.
The Rights Approach. The Utilitarian Approach. The ethical course of action, according to certain philosophers and ethicists, is the one that best upholds and defends the moral rights of those who are impacted. ...The virtue approach, the common good approach, the fairness or justice approach.learn more about ethical framework here
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Eukaryotic mrna molecules may contain non-coding sequences that must be removed before translation. these are called:_______
Answers
Eukaryotic mrna molecules may contain non-coding sequences that must be removed before translation. these are called introns
Introns are removed from the pre-mRNA before the mRNA is exported to the cytoplasm
What are Non coding sequence ?Non coding DNA sequence are components of an organisms DNA that do not encode protein sequences. Some non coding DNA is transcribed into functional non coding RNA molecules.
Transposable elements make up the major part of non coding DNA. These include LINEs, SINEs, satellite DNA and VNTRs. LINEs, or long INterspersed Elements are moderately repetitive, non coding regions possibly derived from viruses.Learn more about Non coding sequence here:
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You are a sales representative for a company that makes a new alternate fuel for vehicles. You have prepared a presentation for the environmental engineers to sell your new product. What question do you expect the audience to ask regarding whether the new fuel will cause less damage to the environment?
A. Do we have to change any parts of the vehicle to use this alternate fuel?
B. Will the vehicles get better fuel mileage with the alternate fuel?
C. How much greenhouse gas does your fuel produce compared with current fuel sources?
D. Is the alternate fuel more expensive than fossil fuel?
Answers
Answer:
C. How much greenhouse gas does your fuel produce compared with current fuel sources?
Explanation:
Answer A asks whether vehicles need to be changed to use the fuel.
Answer B asks whether the vehicles will get better mileage.
Answer C asks whether emissions will be better or worse than current emissions.
Answer D asks whether it will be more expensive than current fuel.
Hope this helps!
Answer:
C. How much greenhouse gas does your fuel produce compared with current fuel sources?
Explanation:
Plato.
What do cell theory and germ theory have in common?
Answers
Hope this helps :)
why might some light-skinned populations, such as the japanese, be missing the f374 allele for lighter skin pigmentation?
Answers
Answer:
Some populations, such as Japanese, are only light-skinned because they avoid tanning. O This allele does not cause depigmentation. O There have been multiple, different mutations that have produced light skin in different populations.
Explanation:
O A. To define
comfortability
O B. To analyze the great mystery within
ourselves
O C. To describe the physical transformation of
a caterpillar
O D. To explain the how the transformation of a
caterpillar is similar to overcoming fear
Answers
The speaker's purpose in the transcripts is to explain how the transformation of a caterpillar is similar to overcoming fear; option D.
What is the transformation of a caterpillar?The transformation of a caterpillar into a butterfly can be seen as a metaphor for overcoming fear.
Just like a caterpillar transforms into a butterfly, overcoming fear involves a process of transformation, growth, and change. Initially, a caterpillar is comfortable in its familiar environment and routine, just as people are often comfortable in their comfort zones.
However, as the caterpillar grows, it becomes too large for its environment and must undergo a physical transformation to become a butterfly. Similarly, when people are faced with challenges or fears, they may need to undergo a personal transformation to overcome them and grow as individuals.
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10. Refer to p. 484 of your textbook. In sex-linked heredity, the characteristic gene is found on the X
(sex) chromosomes; therefore, it is inherited along with the sex of the individual. Hemophilia (X") is
the result of a recessive sex-linked allele. A carrier has one recessive allele for hemophilia; therefore,
she does not have hemophilia but can pass it on. If a normal male marries a carrier, what is the
probability that they will produce a male child who will be a hemophiliac? What is the probability
that they will produce a female child who will have the disease? What is the probability that they
will have a daughter who is a carrier?
Answers
Answer:
they have a chance of 25% of producing a male child who will be haemophiliac.
Explanation:
0% of producing a female child who will have haemophilia
25% of having a daughter who is a carrier
Two scientists do not agree on which type of grocery bag is better for the environment. The Outcome of their disagreement is most likely to be:
Answer my question , ty .
Answers
Answer:
answer is D
Explanation:
during meiosis crossing over takes place between: nonhomologous chromatids. sister chromatids. nonhomologous chromosomes. non-sister chromatids. any two chromatids.
Answers
Crossing over occurs between non-sister chromatids during meiosis.
It happens during meiotic prophase I's pachytene stage. The crossing over process goes as follows: Through a process known as synapsis, homologous chromosomes join together to produce a bivalent (or tetrad) Breaking and recombining with their homologous partner, non-sister chromatids exchange genetic material (crossing over) When chromosomes of the same type are paired together during meiosis, a biological event called crossing over takes place.
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Jackson says, “The really scary things though are the physical, chemical, oceanographic things that are happening.” What does he mean by this?
Answers
Oceanography includes the oceans and sea depicting and analysis or change in the characteristics of water bodies.
By the statement, scary things are happening to the oceans by Jackson means that:
The oceans and aquatic lives are suffering from climatic changes and is undergoing immense physical and chemical changes.
The addition of unwanted wastes, dumps and chemical spills in oceanic bodies are altering the chemical and physical attributes of the water. The habitants of water like fauna and flora are suffering a lot of loss due to changes.
The involvement of human activities has increased water pollution and many other kinds of pollution. Overfishing, oil spills and dumping of waste in water bodies have altered the natural characteristics of water.
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