91. The three most common cell junctions in animals are:
(a) adhesive junctions, tight junctions, gap junctions
(b) adhesive junctions, tight junctions, plasmodesmata
(c) tight junctions, plasmodesmata, adhesive junctions
(d) gap junctions, tight junctions, plasmodesmata
92. The reason urine does not seep out of the bladder is due to the role of:
(a) adherens junctions (b) hemidesmosomes
(c) gap junctions (d) tight junctions
93. Desmosomes and hemidesmosomes are anchored in the cytoplasm by:
(a) desmocollins (c) actin fibers
(b) collagen (d) tonofilaments
94. Gap junctions consist of channels formed by:
(a) hydrophilic, connexons (b) hydrophobic, cadherins
(c) hydrophobic, connexons (d) hydrophilic, cadherins
95. A plant cell wall includes all of the following EXCEPT:
(a) hemicellulose (b) extensins
(c) cellulose (d) collagen
96. Which of the following would be most likely to lead to cancer?
(a) hyperactivity of both a proto-oncogene and a tumor-suppressor
(b) amplification of a proto-oncogene and the failure of a tumor-suppressor gene
(c) hyperactivity of bith a proto-oncogene and a tumor suppressor gene
(d) failure of a proto-oncogene to produce a protein and amplification of tumor
suppressor gene
97. The characteristic strength of woody tissues is due to:
(a) the secondary cell wall (b) hemicellulose
(c) the middle lamina (d) the primary cell wall
98. The rule is derived from the ER and is continuous with the ER of two adjacent plant
cells.
(a) middle lamina (b) annulus
(c) plasmodesma (d) desmotubule
99. One can estimate the length of M phase by knowing:
(a) the S phase (c) the age of the cell
(b) the mitotic index (d) the generation time
100. What is true of proto-oncogenes?
(a) cells produce proto-oncogenes as a by-product of mitosis
(b) proto-oncogenes are necessary for normal control of cell division
(c) proto-oncogenes are genetic junk that has not yet been eliminated by natural
selection
(d) proto-oncogenes are unavoidable environmental carcinogens.
Check Your Answers
(a) adhesive junctions, tight junctions, gap junctions
(b) adhesive junctions, tight junctions, plasmodesmata
(c) tight junctions, plasmodesmata, adhesive junctions
(d) gap junctions, tight junctions, plasmodesmata
92. The reason urine does not seep out of the bladder is due to the role of:
(a) adherens junctions (b) hemidesmosomes
(c) gap junctions (d) tight junctions
93. Desmosomes and hemidesmosomes are anchored in the cytoplasm by:
(a) desmocollins (c) actin fibers
(b) collagen (d) tonofilaments
94. Gap junctions consist of channels formed by:
(a) hydrophilic, connexons (b) hydrophobic, cadherins
(c) hydrophobic, connexons (d) hydrophilic, cadherins
95. A plant cell wall includes all of the following EXCEPT:
(a) hemicellulose (b) extensins
(c) cellulose (d) collagen
96. Which of the following would be most likely to lead to cancer?
(a) hyperactivity of both a proto-oncogene and a tumor-suppressor
(b) amplification of a proto-oncogene and the failure of a tumor-suppressor gene
(c) hyperactivity of bith a proto-oncogene and a tumor suppressor gene
(d) failure of a proto-oncogene to produce a protein and amplification of tumor
suppressor gene
97. The characteristic strength of woody tissues is due to:
(a) the secondary cell wall (b) hemicellulose
(c) the middle lamina (d) the primary cell wall
98. The rule is derived from the ER and is continuous with the ER of two adjacent plant
cells.
(a) middle lamina (b) annulus
(c) plasmodesma (d) desmotubule
99. One can estimate the length of M phase by knowing:
(a) the S phase (c) the age of the cell
(b) the mitotic index (d) the generation time
100. What is true of proto-oncogenes?
(a) cells produce proto-oncogenes as a by-product of mitosis
(b) proto-oncogenes are necessary for normal control of cell division
(c) proto-oncogenes are genetic junk that has not yet been eliminated by natural
selection
(d) proto-oncogenes are unavoidable environmental carcinogens.
Check Your Answers