In a nucleosome, the DNA is wrapped around _____
A) polymerase molecules
B) ribosomes
C) histones
D) a thymine dimer
E) satellite DNA
Answer: C
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Based on the figure above, which of these experimental treatments would increase the rate of sucrose transport into the cell?
A) decreasing extracellular sucrose concentration B) decreasing extracellular pH C) decreasing cytoplasmic pH D) adding an inhibitor that blocks the regeneration of ATP E) adding a substance that makes the membrane more permeable to hydrogen ions
The function of tmRNA in bacteria is to:
A. rescue stalled ribosomes. B. terminate translation at all stopcodons. C. initiate translation at special start codons.
The gonads are another name for the
a. parathyroid and thyroid. b. ovary and testis. c. adrenal cortex and medulla. d. anterior and posterior pituitary. e. testis only.
A differentiated cell ____
a. has only the genes required for that cell type b. is found in the zygote c. is not found after gastrulation d. has all the genes that came from fertilization e. has 23 chromosomes