The cell surface receptors that can act only indirectly on plasma membrane-bound enzymes or ion channels are called:
A. G protein-coupled receptors.
B. enzymatic receptors.
C. gated ion channels.
D. second messenger receptors.
Answer: A
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Synaptonemal complexes form during
A. prophase of meiosis I. B. prophase of meiosis II. C. prophase of meiosis I and meiosis II. D. prometaphase of meiosis I. E. prometaphase of meiosis II.
At one end of a tRNA molecule is a sequence of 3 nucleotides called an anticodon that ____
a. signals the production of a ribosome b. signals the unwinding of the DNA coils c. initiates the movement of mRNA out of the cell nucleus and into the cytoplasm d. binds to its anti-complementary tRNA codon e. binds to its complementary mRNA codo
Differential reproduction is required for genetic drift
a. true b. false
Circle the molecule in each pair that is more likely to diffuse through the lipid bilayer
A. amino acids or benzene B. Cl– or ethanol C. glycerol or RNA D. H2O or O2 E. adenosine or ATP