Which of the following is NOT found in the nucleus?
A. mitochondria
B. nucleolus
C. chromatin
D. DNA
Ans: A. mitochondria
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Agar is produced by
a. brown algae. b. red algae. c. phycobilins. d. brown and red algae. e. red algae and phycobilins
Which of the following statements is CORRECT?
a) the scientific method can be used only to understand scientific phenomena b) common sense is usually a good substitute for the scientific method when trying to understand the world c) a hypothesis that does not generate a testable prediction is not useful d) it is not necessary to make observations as part of the scientific method
A research lab is trying to produce new antibiotics. They come up with drugs that detach the hydrophilic heads from the phospholipids in plasma membranes. This drug
A. would be highly toxic and completely useless for human beings-we also have plasma membranes with hydrophilic head groups!
B. would be highly toxic only to bacteria, making it an excellent drug to develop and test further. Humans have a different phospholipid structure in their cell plasma membranes than bacteria.
C. would generally not be toxic enough to damage Gram-negative bacteria, as their plasma membranes lie under a thick layer of peptidoglycan.
D. would be highly toxic for human beings, but might be useful as a topical antibiotic skin cream. The top layer of skin cells is dead anyway, so it wouldn't matter if this damaged those cells. It could NOT be taken internally, though, by human beings.
ATP is expended in which of the following processes?
A) facilitated diffusion B) diffusion C) group translocation D) active transport E) both active transport and group translocation