How are plasmids different than chromosomes?
A) Plasmids are always small, linear pieces of DNA.
B) Plasmids are composed of single-stranded DNA.
C) Plasmids contain genes that are NOT essential for cellular growth and replication.
D) Plasmids carry unimportant genes that are of little significance for the ecology and metabolism of an organism.
Answer: C
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Apoptosis
A. is a form of cell suicide. B. is induced in target cells by effector T cytotoxic cells. C. results in T cell death. D. refers to the transformation of B cells into plasma cells. E. is a form of cell suicide AND is induced in target cells by effector T cytotoxic cells.
The science of describing, naming, and classifying extant and extinct organisms is
A. evolution. B. phylogeny. C. taxonomy. D. nomenclature. E. biology.
Certain human cell types, such as skeletal muscle cells, have several nuclei per cell. Based on your understanding of
mitosis, how could this happen?
a. The cell undergoes repeated cytokinesis but not mitosis. b. The cell undergoes repeated mitotic divisions with concomitant cytokinesis. c. The cell undergoes repeated mitotic divisions but not cytokinesis. d. The cell undergoes anaphase twice before entering telophase. e. The cell goes through multiple S phases before entering mitosis.
Which of the following statements regarding the demonstration of the etiology of disease is FALSE?
A) The suspect agent must be present in all cases of disease. B) The suspect agent must cause the disease under investigation when introduced into a susceptible host organism. C) The suspect agent must be isolated and cultured in the laboratory. D) It must be possible to reisolate the suspect agent from the infected experimental host. E) The suspect agent must be the only potential pathogen present in disease cases.