The neural crest consists of:
A. embryonic cells on each side of the neural tube
B. embryonic cells that form the kidney
C. clusters of Hox genes
D. cells that form hair follicles
E. cells that lie along the crest of the spine
A. embryonic cells on each side of the neural tube
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A scientist studied peregrine falcons to determine why the numbers of birds was declining. She determined that
A. global warming (too much carbon dioxide) had increased the death rates in the newly hatched chicks. B. the genetic diversity of the falcons was too low to sustain their population level. C. the falcons had lost much of their habitat due to human developments. D. the falcon's habitat had been fragmented and the subsequent edge effect affected their ability to hunt for prey items. E. the levels of DDT in the environment were having a detrimental effect on eggs (causing the eggshells to be too thin) that were being laid by the female falcons.
Relatively small organic molecules with a central carbon atom which is bonded to a carboxyl group, an amino group, a carbon containing group, and a hydrogen atom are called:
A. amino acids. B. fatty acids. C. enzymes. D. peptides. E. nucleotides.
When a nucleic acid undergoes hydrolysis, the resulting subunits are:a
fatty acids. b. amino acids. c. nucleotides. d. carotenoids. e. monosaccharides.
Undiagnosed or untreated infections with Neisseria gonorrhoeae can progress to
A. bubonic plague. B. meningococcal meningitis. C. trench fever. D. pelvic inflammatory disease (PID). E. Q fever.