The predatory bacterium Bdellovibrio bacteriophorus drills into a prey bacterium and, once inside, digests it. In an attack upon a Gram-negative bacterium that has a slimy cell covering,
what is the correct sequence of structures penetrated by B. bacteriophorus on its way to the prey's cytoplasm?
1. membrane composed mostly of lipopolysaccharide
2. membrane composed mostly of phospholipids
3. peptidoglycan
4. capsule
A) 2, 4, 3, 1
B) 1, 3, 4, 2
C) 1, 4, 3, 2
D) 4, 1, 3, 2
D
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Different proteins have different amino acid ________.
Fill in the blank(s) with the appropriate word(s).
A researcher isolates a species of fungus that only reproduces sexually. He introduces individual fungi—all of the same mating type (e.g., with the same mating type alleles)—into a petri dish. What do you expect will happen with the fungi in this dish?
A. Fungi in the dish will mate, forming spores via sexual reproduction. B. Fungi in the dish will not mate, but will from spores via asexual reproduction. C. No spores will be formed by fungi in the petri dish.
When a protist digests its food, particles to be broken down are isolated from the rest of the cell in a ____ , to which digestive enzymes are added
Fill in the blank with the appropriate word.
A B cell CstF-64 mutant will likely:
A. constitutively secrete IgM antibodies. B. selectively remove the VDJ region from IgM antibodies. C. cut IgM pre-mRNA at every available 3'-end cleavage site. D. undergo IgM pre-mRNA splicing between the heavy chain exons and the membrane anchoring exon.