The receptors for a group of peptide signaling molecules known as growth factors are typically ____
a. receptor tyrosine kinases
b. cyclic AMP
c. neurotransmitters
d. G protein-linked receptors
e. ligand-gated ion channels
A
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During a stressful interval, _____
A) thyroid-stimulating hormaon (TSH) stimulates the adrenal cortex and medulla to secrete acetylcholine B) the alpha cells of islets secrete insulin and simultaneously the beta cells of the islets secrete glucagon C) adrenocorticotropic hormone (ACTH) stimulates the adrenal cortex, and neurons of the sympathetic nervous system stimulate the adrenal medulla D) the posterior pituitary gland secretes more growth hormones E) the calcium levels in the blood are increased due to actions of two antagonistic hormones, epinephrine and norepinephrine
Among invertebrates, increased speed along the axon is brought about by increasing the
diameter of the axon. Among vertebrates, this same function (increased speed) is brought about by ____________________.
a. insulating the axons with myelin sheath cells b. increasing the number of pumps c. increasing the number of sodium gates d. making axon terminals larger
Thigmotropism is a growth response to ____
a. light b. day length c. contact with a solid object d. circadian rhythms e. gravity
Briefly describe the relationship between DNA methylation, small RNAs (also known as RNA interference), and mobile genetic elements
What will be an ideal response?