Prokaryotes that obtain their energy by oxidizing hydrogen sulfide in volcanic vents are
A. chemoheterotrophs.
B. chemoautotrophs.
C. photoautotrophs.
D. photoheterotrophs.
Answer: B
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All of the following structures are found within the nucleus of a eukaryotic cell except
A) speckles. B) Cajal bodies. C) promyeloctic leukemia (PML) bodies. D) nucleolus. E) All of the above are found in the nucleus
The proteins of bacteria that are involved in the movement of small molecules into the cell are called
A. transport proteins. B. permeases. C. carriers. D. peptidases. E. transport proteins, permeases, AND carriers.
One technique used to yield a transgenic animal is to
A) amplify DNA from a donor animal and another organism of interest using PCR. B) remove all of the DNA from an animal fetus, and insert new DNA of interest through the use of synthetic DNA "carriers." C) microinject the DNA of interest into an animal's egg. D) introduce proteins from a foreign organism into the blood of a pregnant animal, so that the protein sequences will be used to produce a new DNA template. E) inject the DNA of interest into an animal's bone marrow.
Which of the following is found only in some bacteria?
A. Cell membrane B. Slime layer C. Cytoskeleton D. Flagella