31) Hormones are secreted by
A) phagocytosis.
B) pinocytosis.
C) exocytosis.
D) osmosis.
32) Of the following, the only organelle that has a double membrane structure is the
A) centriole.
B) Golgi apparatus.
C) endoplasmic reticulum.
D) mitochondrion.
33) Functions of the Golgi apparatus include all of the following
except
A) synthesis of lysosomes.
B) DNA replication.
C) plasma membrane formation.
D) production of secretory granules.
34) Which of the following statements about the rough endoplasmic reticulum is
false?
A) It consists of stacked envelopes called cisternae.
B) It makes the digestive enzymes contained in the lysosomes.
C) It stores lipids as inclusions.
D) It makes the integral proteins of the cell membrane.
35) Which of the following is
not
a cytoskeleton element?
A) microtubule
B) microfilament
C) intermediate filament
D) centriole
36) Which type of proteins are required for exocytosis?
A) caveolin
B) coatomer proteins
C) clathrin
D) SNARE proteins
37) In chromatin, the DNA molecule wraps around proteins called
A) nucleotides.
B) codons.
C) integral protein.
D) histones.
38) In the cell life cycle, DNA is replicated during
A) interphase G1.
B) interphase S.
C) prophase I.
D) prophase II.
39) The longest arrays of microtubules that assemble from each centrosome during prophase form filaments called
A) mitotic spindle fibers.
B) kinetochores.
C) asters.
D) the nuclear envelope.
40) During anaphase, motor proteins attached to mitotic spindle fibers serve to
A) pull the chromosomes to opposite poles of the cell.
B) pull together the replicated chromosomal strands.
C) re-form the nuclear envelope.
D) form the aster.