The sequence and actions of genes controlling development of the anterior-posterior axis of Drosophila illustrate (Select all correct choices):
A. hierarchical control of gene regulation
during development.
B. maternal developmental effect.
C. that genes controlling development are
turned on in groups, with each group acting to
refine and narrow the pattern of differentiation
generated by previous groups.
D. that genes controlling development are
turned on in sequence, with each set acting
on a different set of cells to specify the cells'
ultimate fates.
A,C
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When you swallow, the epiglottis covers the opening to the
a. pharynx. b. esophagus. c. larynx. d. bronchus. e. alveoli.
If R is dominant to r, the offspring of the cross of RR with rr will
a. be homozygous. b. display the same phenotype as the RR parent. c. display the same phenotype as the rr parent. d. have the same genotype as the RR parent. e. have the same genotype as the rr parent.
All amino acids are characterized by
A. an amino group and a peptide bond. B. a carboxyl group and a peptide bond. C. the presence of two R groups. D. an amino group and a carboxyl group. E. none of these.
Steroid hormones bind with G-protein linked receptors in plasma membranes of target cells
____________________ Indicate whether the statement is true or false.