Gap genes of Drosophila embryos:a
organize the embryo into broad regions and influence the activity of pair-rule genes.
b. are missing from the chromosomes of mutant flies.
c. are genes that have moved to gaps on other chromosome during meiosis.
d. cause gaps in the cell cycle.
e. cause the death of embryos before they hatch.
a
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Select all of the following that are bryozoans and brachiophytes characteristics.
_____ tentacles that are useful in breathing and feeding. _____ U-shaped digestive tract. _____ lack a coelom. _____ parthenogenesis.
Identify the stage of mitosis shown in panel D
a. interphase b. prophase c. metaphase d. anaphase e. telophase
When amino acid availability exceeds the needs of protein synthesis, ________
a. some amino acids are converted to urea and eventually eliminated in the urine b. the amino group can be removed and the carbon backbone metabolized for energy c. cells will make storage polypeptides in a way similar to glycogen formation d. all of the choices
Which brain structure works in conjunction with the basal nuclei to control motor activity?
a. thalamus b. hypothalamus c. cerebrum d. brain stem e. cerebellum