The chromosome that plays the largest role in human sex determination is
A. the group of autosomes known as the SRY group.
B. the Y chromosome.
C. chromosome number 21.
D. the X chromosome.
E. chromosome number 22.
B. the Y chromosome.
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The molten globule model of protein folding suggests:
A. hydrogen bonding of secondary structures drives folding. B. translation of the polypeptide is complete before folding begins. C. each domain of a polypeptide folds independently. D. intermediates of increasing free energy are created. E. hydrophobic residues coalesce to form intermediate structures.
An important food source for baleen whales are:
a. shrimp. b. krill. c. lobsters. d. crabs. e. horseshoe crabs.
Endodermis cells of the root secrete a waxy
substance on
a. all of their walls. b. the walls that lead into the xylem. c. the walls adjacent to the phloem only. d. walls of the endodermis that touch each other. e. their chloroplasts
The ion required for skeletal muscle contraction is ____
a. chloride b. potassium c. calcium d. phosphate e. ATP