Which cells make you immune to a disease that you were previously exposed to?
a. effector cells.
b. memory cells.
c. dendritic cells.
d. phagocytes.
e. fibroblasts.
B
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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.
The only source of variety and diversity in sexually reproducing organisms is through mutations
Indicate whether the statement is true or false
How many different amino acids could be encoded by the synthetic mRNA sequence 5' UGCUGCUGC 3'?
A) 0 B) 1 C) 2 D) 3 E) 6
________ is the hormone released by the pancreas to lower levels of glucose in the blood.
Fill in the blank(s) with the appropriate word(s).