You are observing a Gram stain of spherical-shaped microorganisms that are linked in a chain and stain purple. How would you describe these bacteria using the correct terminology for the cell shape and arrangement?
a. gram-negative staphylococci
b. gram-positive streptococci
c. gram-positive coccobacilli
d. gram-positive tetrads
Answer: b. gram-positive streptococci
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A researcher wants to clone a specific gene of interest. Why would he/she choose a viral vector for introducing the gene of interest into a host cell?
A. A viral vector contains its own metabolic machinery and does not affect the host cell. B. A viral vector can infect living cells and take control of the host cell's metabolic machinery. C. A viral vector is nonliving. D. A viral vector contains circular DNA, thus it is easier to insert the gene of interest. E. None of the choices are correct.
The cytoplasmic membrane of both eukaryotes and prokaryotes functions to
A. form endoplasmic reticulum. B. produce energy. C. regulate movement of molecules that enter and leave the cell. D. form lysosomes and Golgi apparatus.
Which of the following have a thicker muscular wall?
a. arteries b. veins c. capillaries
The wild-type pUC19 plasmid (blue plasmid) contains genes for
a. antibiotic resistance. b. activation of ?-galactosidase production. c. both a and b. d. none of these choices.