Amino acids are the building blocks for:
a. proteins
b. steroids
c. lipids
d. nucleic acids
e. carbohydrates
a
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How did the eukaryotic nucleus arise?
a. through the uptake of the cell's genome by a membrane organelle already present in the cell b. through cytoplasmic diffusion c. through an endosymbiotic relationship with a bacteria d. through infoldings of the cell's plasma membrane e. through formation of a new internal membrane by the eurkaryotic cell
Probes for cloned genes use
a. complementary nucleotide sequences labeled with a tracer b. specific antibodies that kill all the cells except those that have incorporated the genes. c. specific enzymes that lyse all the cells except those that have incorporated the genes. d. certain bacteria that glow when they take up the genes. e. all of these.
Which stage of cellular respiration requires oxygen that you breathe?
A) Glycolysis B) Citric acid cycle C) Electron transport chain D) All of the above
Among the virulence factors produced by Staphylococcus aureus are hemolysin, coagulase, hyaluronidase, and enterotoxin. Which of these factors contribute to the ability of S. aureus to invade the body?
A) coagulase B) enterotoxin C) hemolysin D) hyaluronidase E) coagulase and hemolysin