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Exam 2: The Molecules of Cells

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Question 31

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A long chain of carbon atoms with hydrogen atoms attached,ending in the acidic group -COOH would be a(n)

A) triglyceride.
B) amino acid.
C) fatty acid.
D) nucleic acid.
E) monosaccharide.

F) A) and E)
G) C) and D)

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Question 32

Multiple Choice

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Determine what would happen to an individual's proteins if they developed a fever of 103^o F for several days.

A) The proteins would denature due to the increase in body temperature and would become unable to function correctly.
B) The proteins would increase in their ability to perform their functions because of the increase in body temperature.
C) Nothing would happen to the proteins as a result of the increase in temperature.
D) The proteins would denature due to the increase in body temperature and would increase in their ability to function correctly.
E) One protein would alter in shape which would then cause the next protein to alter in shape which would cause a third protein to alter in shape and so forth until all of the proteins were altered in shape.

F) C) and D)
G) All of the above

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Question 33

Multiple Choice

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Which of the following sequences correctly lists the bonds in order of strongest to weakest?

If an element has an atomic number of 15,then

Which statement about the cellular nucleic acids DNA and RNA is incorrect?

The proposed cause of CJD and kuru in humans,mad cow disease,and scrapie in sheep is a change in a brain protein.Disease victims appear to have a protein that should normally contain alpha helices but instead they have changed into a protein made of beta pleated sheets.The disease appears to spread when the abnormal protein comes into contact with the normal protein,causing it to become deformed.Which level of protein structure is associated with these diseases?

Which of the following types of lipids is the most abundant constituent of cell membranes?

If neutral atoms become positive ions,they

The final shape of a protein is very important to its function.When proteins undergo an irreversible change in shape called ________________ they ________________ perform their usual functions.

To measure the activity of the human brain during certain thought processes,a short-lived radioactive sugar is injected in the carotid artery and is utilized by those cells that are most active.This shows up on a PET scan and demonstrates the detection of

Aspirin is acetyl salicylic acid and can therefore pose a problem to people who have ulcers.Bufferin is an alternative to aspirin that uses a buffer to neutralize this effect by

A genetic mutation can cause a change in the sequence of the 20 amino acids used to build proteins.Such a change is a change to the protein's

Nucleic acids are polymers of

You notice that rain water forms "beads" on your car.This is an example of what property of water?

Which of the following molecules is inorganic?

In the search to discover the agents that cause mad cow disease,scrapie in sheep,and CJD and kuru in humans,diseased brain tissues were passed through a fine filter to remove bacteria.The filtrate was still infectious,indicating that something smaller than bacteria,either viruses or organic molecules,must be the causative agent.If a virus was responsible for these brain diseases,then the infectious agent would contain either RNA or DNA.Other possibilities were that the agent was a carbohydrate,fat,or protein.Tissue filtrates were treated with agents that destroyed just one of these chemicals and then injected into a healthy animal,with the results as follows.What is the infectious agent? $\bullet$ Amylase digests carbohydrates; tissue filtrate still infects healthy test animal. $\bullet$ Lipase digests fats; tissue filtrate still infects healthy test animal. $\bullet$ Formaldehyde and/or heat denatures DNA and RNA; tissue filtrate still infects healthy test animal. $\bullet$ Trypsin digests protein; tissue filtrate does not infect healthy test animal.

During the formation of a polymer,two monomers are joined by the removal of

In water,a weak hydrogen bond occurs between hydrogen in one molecule and

Briefly describe how ATP is broken down and turned into ADP.

Which of the following subatomic particles will be found within the nucleus of the atom?