What is the order of action of these classes of genes during Drosophila development?
A) maternal effect, gap, pair rule, segment polarity
B) maternal effect, gap, segment polarity, pair rule
C) maternal effect, pair rule, segment polarity, gap
D) maternal effect, segment polarity, gap, pair rule
A) maternal effect, gap, pair rule, segment polarity
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Mutations can be
a. random. b. beneficial. c. harmful. d. heritable. e. all of these
Which of the following describes the plant cell during cellular division?
a. Cleavage furrowing occurs during telophase. b. A cell plate forms between the two "new" nuclei during telophase. c. The centrioles migrated to opposite ends of the cell. d. The spindle fibers form from the centrioles. e. All of these describe plant cell division.
Where is glycogen stored in vertebrate animals?
A) Pancreas and blood B) Liver and muscles C) Brain and kidneys D) Teeth and bones E) Fat cells
Low body temperature triggers (A)______, followed by (B)_________. These hormone secretions activate cellular metabolism.
a. (A) reduction of TSH (B) reduction of thyroxin b. (A) reduction of glucocorticoid (B) up-regulation of thyroxin c. (A) up-regulation of glucocorticoid (B) reduction of thyroxin d. (A) up-regulation of TSH (B) up-regulation of thyroxin