Bio Test 3 (Part 2)

11 Questions | By Ohchimonkey | Last updated: Mar 21, 2022 | Total Attempts: 66

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Bio test part 2 of 5. 55 question test.

Questions and Answers

1.

Repressor proteins
- A.
  
  Prevent binding of RNA polymerase to DNA.
- B.
  
  Cause the DNA regions that contain the operator to twist or loop.
- C.
  
  Inactivate operon genes when their products are not required.
- D.
  
  Bind to sets of operators.
- E.
  
  All of these.
2.

The obvious advantage of the lactose operon is that
- A.
  
  It allows bacteria to survive in the presence of lactose.
- B.
  
  Lactose-metabolizing enzymes need not be made when lactose is not present.
- C.
  
  It enables bacteria to make lactose only in the presence of the proper enzymes.
- D.
  
  It negates the need for milk in the diet of adult humans.
- E.
  
  It enables glucose to substitute for lactose in the diet of lactose intolerant persons.
3.

Which of the following accounts for the negative control of operons?
- A.
  
  Promoters
- B.
  
  Repressors
- C.
  
  Structural genes
- D.
  
  Operators
- E.
  
  All of these
4.

The positive control of the lactose operon in bacteria is
- A.
  
  Activated by a repressor protein.
- B.
  
  Independent of glucose concentration.
- C.
  
  Activated by the CAP.
- D.
  
  Regulated by RNA polymerase.
- E.
  
  All of these.
5.

Refer to Figure 15-3 to answer the following questions.As a result of the action illustrated in the figure,
- A.
  
  Structural genes are transcribed.
- B.
  
  Lactose is broken down.
- C.
  
  The lactose operon is repressed.
- D.
  
  The regulatory gene is inactivated.
- E.
  
  Lactose production is enhanced.
6.

Lamarck's contribution to the theory of evolution is the concept of
- A.
  
  Natural selection.
- B.
  
  Catastrophism.
- C.
  
  Inheritance of acquired characteristics.
- D.
  
  Mutation.
- E.
  
  Geographic distribution of organisms.
7.

Which of the following would be a modern example of Lamarckianism?
- A.
  
  A strain of houseflies resistant to insecticides emerges.
- B.
  
  Squirrels separated by a river are found to be unable to interbreed.
- C.
  
  A son is born with a portion of his right index finger missing, the same portion severed from his father's hand in an accident.
- D.
  
  A strain of houseflies resistant to insecticides emerges; and squirrels separated by a river are found to be unable to interbreed.
- E.
  
  A strain of houseflies resistant to insecticides emerges; and squirrels separated by a river are found to be unable to interbreed; and a son is born with a portion of his right index finger missing, the same portion severed from his father's hand in an accident.
8.

Galapagos finches are examples of
- A.
  
  Scavengers.
- B.
  
  Morphological isolation.
- C.
  
  Adaptive radiation.
- D.
  
  Punctuated equilibrium.
- E.
  
  The inheritance of acquired characteristics.
9.

Natural selection operates to produce changes in
- A.
  
  Individuals.
- B.
  
  Populations.
- C.
  
  Kingdoms.
- D.
  
  Phyla.
- E.
  
  Animals only.
10.

One part of Darwin's theory is that individuals with certain traits have an increased competitive edge. The source of these traits is
- A.
  
  Adaptation to the stress.
- B.
  
  Development over a lifetime.
- C.
  
  Inheritance at conception.
- D.
  
  Mutation after birth.
- E.
  
  All of these.
11.

The operation of natural selection depends upon the fact that
- A.
  
  The strong always survive, whereas the weak always die.
- B.
  
  Some individuals have a better chance to produce more offspring.
- C.
  
  Mutations are always harmful.
- D.
  
  Acquired characteristics are inherited.
- E.
  
  Reproduction of all members of a species is virtually the same.

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