The history of biotechnology spans
A) around 100 to 150 years. B) about 1,000 years.
C) at least 10,000 years. D) fewer than 50 years.
C
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In your fly laboratory, you find a larva that is missing segments Lb, T1, T2, and T3. This larva probably has a mutation in a ___________ gene.
A. pair-rule B. gap C. maternal effect D. segment-polarity E. gap or segment-polarity
Dyneins are
A) associated with organelle movement. B) associated with cilia and flagella. C) monomeric myosin-like proteins. D) responsible for anterograde transport. E) all of the above
While studying a protein synthesized by human liver cells, you notice a correlation between stress and decreased levels of this protein. Initially, you hypothesized that stress caused phosphorylation of eIF-2, and a commensurate reduction in protein synthesis, but further investigation revealed that the rate of synthesis of this protein had not changed—there simply was not as much within the cells as expected, nor was the protein being secreted by the cells. What possible explanation remains?
a. Stress alters the protein structure making it undetectable. b. Stress weakens the polypeptide bonds in this protein. c. Stress causes ubiquitin to bond to the protein. d. Stress causes eIF-2 to hydrolyze the protein.
Chlorofluorocarbons (CFCs) are one of the main gasses that contribute to the destruction of the ozone layer. Which of the following is not a source of CFCs?
a. Plastic foam b. Coolants in appliances c. Aerosol cans d. Solvents e. Exhaust from automobiles