Review Figure 19.15 below: Which one of the following statements about mutations in the lactose operon is not correct?
A. A lacI mutant would result in the loss of
expression of repressor protein.
B. A lacI mutant would allow continuous or
constitutive expression of both -galactosidase
and lactose permease.
C. A mutation in the lacO sequence would
allow continuous or constitutive expression of
both -galactosidase and lactose permease.
D. In cells containing one mutant and one
normal copy of lacI, the repressor is still
expressed and lacZ and lacY will be
expressed only in the presence of lactose.
E. In cells containing one mutant and one
normal copy of lacO, lacZ and lacY are
expressed only in the absence of lactose.
E
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Cancer causing genes found in some viruses are called:
A. oncogenes. B. proto-oncogenes. C. tumor suppressor genes. D. viral genes.
Learned behavior
(a) has a learning component. (b) has a genetic component. (c) has no genetic component. (d) has both a and b.
Altruistic behavior is
a. selfish. b. sexually directed behavior. c. self-sacrificing behavior. d. aggressive behavior. e. nonreactive, such as freezing at the sign of danger.
Refer to Figure 47-1. Nerves would be located in the part labeled as number:
a. 2 only
b. 3 only
c. 4 only
d. 2 and 3
e. 3 and 4