Biology Test Bank Exam Questions And Answers. Verified and Updated.
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Course
Biology
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Biology
Biology Test Bank Exam Questions And
Answers. Verified and Updated.
Anything that prevents ATP formation will most likely - answerResult in cell death
When a cell uses chemical energy to perform work, it couples a(n) _____reaction with a(n)
_____________ reaction. - answerExergonic......endergo...
EXAM STUDY MATERIALS July 24, 2024 1:33:58 PM Biology Test B ank Exam Questions And Answers. Verified and Updated. Anything that prevents ATP fo rmation will most likely - answer✔✔Result in cell death When a cell uses chemical energy to perform work, it couples a(n) _____reaction with a(n) _____________ reaction. - answer✔✔Exergonic......endergonic Which of the following is true about the ATP molec ule? - answer✔✔It contains a nitrogen base molecule called adenine ATP can be used as the cell's energy currency, because_______ - answer✔✔Endergonic reactions can be fueled by coupling them with the hydrolysis of high -energy phosphate bonds in ATP An ener gy barrier_____ - answer✔✔Prevents the spontaneous decomposition of ATP in the cell Most of a cell's enzymes are_____ - answer✔✔Proteins When an enzyme catalyzes a reaction, ____ - answer✔✔It lowers the activation energy of the reactant The active site of an enzyme is_____ - answer✔✔The region of an enzyme that attaches to a substrate Which one of the following is false? - answer✔✔Enzymes are used up in chemical reactions Which one of the following is true? - answer✔✔Enzymes catalyze specific reactions Whic h of the following substances could be a cofactor? A) a proteim B) a polypeptide C) a zinc atom D) a ribosome E none of the choices are correct - answer✔✔a zinc atom A child is brought to the hospital with a fever of 107 degrees F. Doctors immediately order an ice bath to lower the child's temperature. Which explanation offers the most logical reason for EXAM STUDY MATERIALS July 24, 2024 1:33:58 PM this action? - answer✔✔Elevated body temperatures may denature en zymes. This would interfere with the cell's abilities to catalyze various reactions Heating inactivates enzymes by - answer✔✔Changing the enzymes 3 dimensional shape Which of the following is a coenzyme? - answer✔✔Vitamin B6 Which of the following can affe ct the rate of an enzyme -catalyzed reaction? - answer✔✔All of the choices: Temperature pH Competitive inhibitors Non competitive inhibitors Inhibition of an enzyme is irreversible when - answer✔✔Bonds form between inhibitor and enzyme How does inhibition of an enzyme -catalyzed reaction by a competitive inhibitor differ from inhibition of a noncompetitive inhibitor? - answer✔✔Competitive inhibitors bind to the active site of the enzyme; non competitive inhibitors bind to a different site Bacterial producti on of the enzymes needed for the synthesis of the amino acid tryptophan declines with increasing levels of trytophan and increases as tryptophan levels decline. This is an example of - answer✔✔Feedback inhibition A medical research team is concerned about the outbreak of a new disease in humans. The bacteria that cause the disease resemble bacteria that cause a similar disease in cattle. The bovine disease is treated with a drug that inhibits a bacterial enzyme crucial to bacterial cell division. As the res earchers prepare to test the drug in humans, they will - answer✔✔Be uncertain about its safety; human cells contain some enzymes that are very similar to those found in bacterial cells; the drug may inhibit these enzymes and damage the human cells Malathio n and tetracycline are both enzyme inhibitors. Malathion is used to kill insects.; tetracycline to kill bacteria. Malaythion is more toxic to human cells than is tetracycline. Which of the following explanations for the difference in toxicity to human cell s would be reasonable? - answer✔✔Human cells contain the enzymes inhibited by both compounds, but the enzyme inhibited by malathion is not metabolically crucial. Where are eukaryotic cell enzymes typically located? - answer✔✔In cell membranes and inside organelles Plasma membranes are selectively permeable. This means that - answer✔✔The plasma membrane allows some substances to enter or leave a cell more easily than others
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