Which statement is FALSE about a cell’s cytoskeleton?
(A) microtubules are the largest of the 3 types of fibers
(B) intermediate filaments are stable and durable
(C) microfilaments support cellular projections like villi
(D) microtubules grow from the centrosome
(E) all of these are true statements
Which of the following is critical in limiting the size to which an animal cell may grow?
(A) The ratio of cell surface to cell volume
(B) The abundance of mitochondria in the cytoplasm
(C) The chemical composition of the cell membrane
(D) The presence of an inelastic cell wall
(E) The relative number of nucleoli
Protein synthesis is the main function of which of the following structures?
(A) Nucleus
(B) Ribosome
(C) Chromosome
(D) Mitochondrion
(E) Vacuole
Neurotransmitters contained in vesicles enter the synapse through
(A) binary fission
(B) translocation
(C) diffusion
(D) exocytosis
(E) endocytosis
An enzyme-substrate complex is composed of which of the following?
I. enzyme
II. substrate
III. coenzyme
(A) I only
(B) II only
(C) both I and II
(D) both II and III
(E) I, II, and III
All of the following statements about enzymes are true EXCEPT
(A) A single enzyme molecule can be used over and over again.
(B) Most enzymes are highly specific with regard to the reactions they catalyze.
(C) Some enzymes contain an essential nonprotein component.
(D) Enzymes can function only within living cells.
(E) Most enzymes are denatured by high temperatures.
When a protein is heated, which of the following will most likely be disrupted?
(A) The amino acid sequence
(B) The tertiary structure
(C) The carbon backbone
(D) The carboxyl groups
(E) The peptide bonds
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