Review figure 1. this is an example of which type of transport?
a. facilitated diffusion
b. simple diffusion
c. active transport
d. group translocation
Answer: a. facilitated diffusion
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A riboswitch mechanism is known to regulate the transcription of genes involved in:
A. lactose metabolism. B. vitamin B1 synthesis. C. tryptophan biosynthesis. D. arabinose metabolism.
A new drug is developed thatinhibits formation of the flagellar filament by impairing production of the protein flagellin. Is this going to be a good drug?
A. Potentially-it would definitely only impair bacteria, but wouldn't matter for the ones that don't use a flagellum to move around. B. Potentially-if it could be shown that it also didn't impair the production of the eukaryotic flagellum. C. No-our eukaryotic cells depend on flagella to move around in our body, and this would impair that function. D. No-bacterial flagella are produced using microtubules, not the protein flagellin. This drug would be useless in eliminating bacteria.
Which white blood cell type is usually the first
to encounter an invading pathogen?
a. B cell b. T cell c. macrophage d. natural killer cell e. basophil
Which of the following situations would be considered an example of positive regulation of gene expression in a prokaryote?
A. The CAP protein activating the lac operon when lactose is absent and glucose is present. B. The CAP protein activating the lac operon when glucose is absent and lactose is present. C. The repressor protein activating the lac operon when lactose is absent and glucose is present. D. The repressor protein activating the lac operon when glucose is absent and lactose is present.