When an action potential reaches a neuron terminal, it causes uptake of _______ ions, which are most directly responsible for exocytosis of neurotransmitter.
A. potassium
B. sodium
C. calcium
D. chloride
Ans: C. calcium
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The difference between phenotype and genotype is that
A) phenotype refers to the genetic instructions and genotype to their expression. B) genotype refers to the genetic instructions and phenotype to their expression. C) the phenotype is RNA and the genotype is DNA. D) the phenotype is DNA and the genotype is RNA.
What would happen if a woman took supplemental estrogen and progesterone beyond the 21st day of her
menstruation cycle? What will be an ideal response?
Biologists have found that the genetic code is universal, that the same codons code for the same amino acids in almost all living things. Explain how this can be considered evidence for evolution.
What will be an ideal response?
The layer of the gastrointestinal tract wall that is responsible for motility is the
A) muscularis. B) mucosa. C) serosa. D) submucosa. E) glandular.