About how long is required for a Mexican leaf frog to capture a cricket, from the beginning of
movement by the frog to the closing of the frog's mouth?
a. 50 milliseconds
b. 1 second
c. 80 milliseconds
d. 260 milliseconds
e. 3 seconds
D
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If a male cat with orange fur produces female offspring with calico fur, what color was the mother cat?
A. orange B. black C. calico D. black or calico E. orange or calico
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.
The type of cell junction that helps stop leaks between cells by forming a gasket-like seal is a(an) ________ junction.
a. loose b. basement c. tight d. adhering e. gap
If a cell reverses the process of beta-oxidation, which of the following molecules will it make?
A) glycerol B) amino acids C) fatty acids D) nucleotides E) starch