The receptors for a group of signaling molecules known as growth factors are often
A) ligand-gated ion channels.
B) G protein-coupled receptors.
C) cyclic AMP.
D) receptor tyrosine kinases.
E) neurotransmitters.
Ans: D) receptor tyrosine kinases.
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Among the actions listed below, which are involved in PCR, and in what order? Extension Initiation Denaturation Termination Annealing
A. Initiation, extension, termination B. Denaturation, annealing, extension C. Denaturation, extension, termination D. Initiation, denaturation, extension E. Annealing, initiation, termination
Which cells produce antibodies?
a. helper T cells b. dendritic cells c. cytotoxic T cells d. NK cells e. B cells
Four of the five items listed below are related
to genetic information. Select the EXCEPTION.
a. chromatids b. centromere c. chromosome d. phosphorylation e. polymerase
Fossil evidence shows that all modern human populations evolved from human ancestors in Africa
Indicate whether the statement is true or false