An abnormal change in the sizes, shapes, and organization of cells is ____
a. dysplasia
b. aplasia
c. heteroplasia
d. hyperplasia
e. hypertrophy
ANSWER: a
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Which of the following statements about sister chromatids is false?
a. They arise by replication during S phase. b. They separate from each other during each mitotic anaphase. c. They usually contain identical versions of the same genetic information. d. They separate from each other during meiosis I. e. They are joined during prophase I and metaphase I at their common centromere.
A patient presents with severe colitis associated with an overgrowth of Clostridium difficile in the lower bowel. The most likely cause of this condition is
A. botulinum food poisoning B. a stomach ulcer C. a compromised immune system D. antibiotic therapy E. mechanical blockage of the large intestine
A nucleic acid probe is a(n)
A) virus that transfers DNA to a recipient cell. B) piece of radioactively labeled DNA that is used to locate a specific gene. C) enzyme that locates a specific restriction site on RNA. D) plasmid that recognizes a specific DNA sequence.
Why does exchange occur only in capillaries and not in arteries or veins?
What will be an ideal response?