The procedure by which embryos produced during in vitro fertilization are tested for defects is called

a. chorionic villus sampling.
b. preimplantation diagnosis.
c. amniocentesis.
d. fetoscopy.
e. senescence.


B

Biology & Microbiology

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Saprobes are ________

a. fungi, animals, prokaryotes, or protists b. all of the choices c. chemoheterotrophs d. decomposers

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The autoclave treatment may be monitored by

A. heat-sensitive tape. B. heat-resistant endospores of Geobacillus stearothermophilus. C. pressure indicators alone. D. waiting for contaminants to appear on freshly poured media. E. heat-sensitive tape AND heat-resistant endospores ofGeobacillus stearothermophilus.

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What mechanism is one that prevents fertilization due to reproductive times?

a. Behavioral isolation b. Anatomical isolation c. Habitat isolation d. Temporal isolation

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Bush beans grow as small bushes rather than as vines because their internodes are short and they branch close to the apical meristem. Which substance, if applied to a bush bean, might cause it to elongate its internodes and grow as a vine?

A) a cytokinin B) a gibberellin C) abscisic acid (ABA) D) ethylene

Biology & Microbiology