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. do all of these.
E
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The genes along a particular linear chromosome are illustrated below.
 - Word.png)
The frequency of crossover events between these loci will be least frequent when considering genes
A) a and b.
B) b and c.
C) c and d.
D) d and e.
E) a and e.
A graded, subthreshold change in the postsynaptic membrane potential that moves it toward threshold
is called a(n)
a. IPSP. b. hyperpolarization. c. EPSP. d. depolarization. e. repolarization.
What is a key morphological difference between fish and amphibians?
A. Fish have gills to extract oxygen from water. B. Amphibians have strong muscular and skeletal systems to support their body on land. C. Amphibians have amniotic eggs. D. Fish have a lateral line system.
Four of the five answers below are correct statements about seedless vascular plants. Select the exception
a. Sporophytes are independent of gametophytes. b. Water is not needed for gamete transport. c. Sporophytes have vascular tissue. d. Seeds are not produced. e. Living members still exist.