You have identified a mutant in human cells that when shifted to 37°C, the microfilaments depolymerize (fall apart). Which of the following would be true about this mutant at 37°C?
A) The endoplasmic reticulum could still import polypeptides but could no longer synthesize lipids.
B) The sister chromatids would no longer be attached to each other.
C) The cells would no longer be able to produce ATP.
D) The mitochondria would no longer work.
E) The cells would change shape.
Answer: E
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In the lab you isolate a Chlorella mutant that is unable to switch xanthophyll pigments into the inactive, non-heat-dissipating form. If you released that mutant into a small pond shaded by trees, would the mutation spread, and why?
A. No, light absorbed by xanthophylls is not used to make ATP or NADPH. B. No, the xanthophylls prevent the production of reactive oxygen species. C. Yes, the xanthophylls prevent the production of reactive oxygen species. D. Yes, the heat released by the xanthophylls would warm up the cells and enhance photosynthesis. E. No, mutations never spread in nature.
Which cell organelle is responsible for producing the color of human skin?
a. Chloroplast b. Melanosomes c. Mitochondria d. Melanin e. Nucleus
This animal has a small coelom, soft body, a
hinged two-part shell, and no distinct head. This animal is ___.
a. a clam b. a slug c. an octopus d. a planarian e. more than one of these
Streptomycin is an antibiotic that interferes with the function of the 30S subunit of the prokaryotic ribosome. What is the consequence of treating a bacteria with streptomycin?
A. impaired oxygen synthesis B. impaired ATP synthesis C. impaired protein synthesis D. impaired DNA synthesis