51) Which of the following does
not
pass through nuclear pores?
A) chromatin
B) messenger RNA
C) proteins
D) ribosomal RNA
52) Which of the following is associated with protein synthesis?
A) mitochondria
B) ribosomes
C) chloroplasts
D) smooth endoplasmic reticulum
53) Ribosomes may be either free within the cytoplasm or bound to a membrane system known as the
A) Golgi apparatus.
B) microtubule organizing center.
C) cytoskeleton.
D) rough endoplasmic reticulum.
54) Which is
not
part of interphase?
A) G1
B) G2
C) M
D) S
55) Embedded in the plasma membrane of cells, cholesterol molecules act to
A) stabilize the membrane.
B) make the membrane more resistant to freezing.
C) destabilize the membrane, leading to heart attacks.
D) participate in pinocytosis.
56) The endocytotic process in which small vesicles of fluid are brought into the cell is called
A) phagocytosis.
B) pinocytosis.
C) exocytosis.
D) xenocytosis.
57) The double membrane structure is unique to the
A) lysosome.
B) peroxisome.
C) mitochondrion.
D) nucleolus.
58) Peroxisomes
A) are the toxic waste removal system of the cell.
B) are involved in the production of ATP.
C) contain some of the code necessary for their own duplication.
D) synthesize proteins for use outside the cell.
59) The stiffest elements of the cytoskeleton, analogous to the bones of the human body, are
A) microtubules.
B) microfilaments.
C) intermediate filaments.
D) the cytosol.
60) The mitotic spindle forms from the
A) nucleus.
B) Golgi apparatus.
C) centrosome matrix.
D) nucleolus.