FREE AND STUDY GAMES ABOUT BIO CH 2 EXAM

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FREE AND STUDY GAMES ABOUT BIO CH 2 EXAM

QUESTIONS

Actual Qs and Ans Expert-Verified Explanation

This Exam contains:

-Guarantee passing score -39 Questions and Answers -format set of multiple-choice -Expert-Verified Explanation

Question 1: Which of the following statements best summarizes an important

consequence of the first law of thermodynamics for living organisms?

Answer:

Each organism ultimately must obtain all of the necessary energy for life from its environment.Question 2: Which of the following characteristics is responsible for the complexity and variety of organic molecules?

Answer:

the chemical versatility of carbon atoms Question 3: People who are lactose intolerant cannot extract energy from milk because...

Answer:

an enzyme is not functioning correctly

Question 4: ATP is necessary for life because...

Answer:

it is the principle energy carrying molecule in a cell

Question 5: The results from Stanley Miller's 1953 experiments can best be used to support which of the following hypotheses?

Answer:

organic molecules can be synthesized abiotically under conditions that may have existed on early Earth Question 6: Which of the following characteristics is most likely to be associated with an enzyme that catalyzes two different chemical reactions?

Answer:

The enzyme has two distinct active sites.

Question 7: Which two functional groups are always found in amino acids?

Answer:

carboxyl and amino groups Question 8: The term insoluble fiber on food packages refers to which of the following molecules?

Answer:

cellulose Question 9: In addition to activating or inhibiting enzymes through allosteric regulation, which of these mechanisms do cells also use to control enzymatic activity?

Answer:

localization of enzymes into specific organelles or membranes Question 10: Which of the following terms best describes a chemical reaction for which ?G is positive?

Answer:

endergonic Question 11: A clasping handshake may be used as an analogy for an enzyme-catalyzed reaction because it represents the specific manner in which an enzyme...

Answer:

binds substrate

Question 12: When chemical, transport, or mechanical work is performed by an organism, what happens to the heat that is generated?

Answer:

It is lost to the environment.Question 13: Which of the following statements best describes an exergonic reaction?

Answer:

The reaction proceeds with a net release of free energy.

Question 14: Why can humans digest starch but not cellulose?

Answer:

Humans have enzymes that can hydrolyze the ?-glycosidic linkages of starch but not the ?-glycosidic linkages of cellulose.Question 15: Which of the following terms most precisely identifies the cellular process of breaking down large molecules into smaller ones?

Answer:

catabolism (catabolic pathways) Question 16: Research indicates that ibuprofen, a drug used to relieve inflammation and pain, is a mixture of two enantiomers; what are enantiomers?

Answer:

Molecules that are mirror images of each other.Question 17: Which polysaccharide is an important component in the structure of many animal and fungal cells?

Answer:

chitin Question 18: The "flow of genetic information" in molecular biology follows the following path...

Answer:

DNA is transcribed into RNA, which is translated into protein

Question 19: Which chemical change will convert ADP to ATP?

Answer:

by adding energy and a phosphate Question 20: Which of the following statements describes the interaction of water molecules with phospholipids?

Answer:

The polar heads interact with water; the nonpolar tails do not.Question 21: Which of the following best compares dehydration reactions and hydrolysis?

Answer:

Dehydration reactions assemble polymers; hydrolysis reactions break polymers apart.Question 22: Which of the following statements best describes metabolism in its entirety in all organisms?

Answer:

Metabolism consists of all the energy transformation reactions in an organism.Question 23: Which of the following statements is correct regarding starch and cellulose?

Answer:

They are polymers of glucose.Question 24: Which of the following unique feature of carbon allows it to support life on Earth?

Answer:

Carbon can form a variety of bonds in nature.Question 25: How does a noncompetitive inhibitor decrease the rate of an enzyme-catalyzed reaction?

Answer:

by binding to an allosteric site, thus changing the shape of the active site of the enzyme Question 26: Which of the following can be used to predict the 3-D structure of the protein?

Answer:

sequence of amino acids in the polypeptide chain