During gastrulation,
A) the blastomeres fuse.
B) the placenta penetrates the endometrium.
C) three germ layers are formed.
D) cells from the hypoblast move to the epiblast.
E) the neural tube closes.
C
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The only sense in which signals pass directly to the cortex without first passing through the thalamus is __________.
Fill in the blank(s) with the appropriate word(s).
Compare the role of water in hydrolysis and dehydration synthesis reactions
A) In hydrolysis, water is a reactant; in dehydration synthesis, water is a product. B) In hydrolysis, water is a product; in dehydration synthesis, water is a reactant. C) In hydrolysis and dehydration synthesis, water is a reactant. D) In hydrolysis and dehydration synthesis, water is a product. E) In hydrolysis and dehydration synthesis, water is an enzyme.
Which is an example of long-loop negative feedback?
A. stimulation of dopamine release by prolactin B. inhibition of growth hormone-releasing hormone (GHRH) release by growth hormone (GH) C. inhibition of growth hormone-releasing hormone (GHRH) release by insulin-like growth factor-1 D. inhibition of corticotropin-releasing hormone by adrenocorticotropic hormone (ACTH) E. stimulation of thyroid-stimulating hormone (TSH) release by thyrotropin-releasing hormone (TRH)
The major metabolic effects of glucagon include
A. stimulating glycogenolysis and gluconeogenesis in the liver. B. stimulating the activity of glycogen synthase in the liver. C. inhibiting the enzyme glycogen phosphorylase in the liver. D. stimulating glucose uptake into skeletal muscle cells. E. stimulating triglyceride synthesis in adipose tissue.