The glycerol head of a phospholipid can be described as _________, while the fatty acid tails can be described as ________.
a. hydrophobic; hydrophobic
b. hydrophilic; hydrophobic
c. hydrophilic; hydrophilic
d. hydrophobic; hydrophilic
b. hydrophilic; hydrophobic
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How does primary protein structure affect the function of protein enzymes?
A) Substrates interact with R-groups at the enzyme's active site. B) Substrates interact with R-groups at the enzyme's external surface. C) Substrates interact with hydrophobic R-groups at any region of the enzyme. D) Substrates permanently bind to R-groups at the enzyme's active site.
Messenger RNAs that contain no stop codons due to a frameshift mutation are eliminated by
A) nonstop decay. B) directed RNase activity. C) nonsense-mediated decay. D) error-mediated repair. E) none of the above
Sharks are osmoconformers that maintain osmolarity with the saltwater but keep ion concentrations similar to osmoregulators. To do this they must use non-ions to osmoregulate, such as urea. As such sharks take on excess ions from the water because their bodies are at a significantly lower ion level than saltwater. How are the excess ions eliminated?
A. diffusion across the gills B. active transport across the gills C. Rectal gland D. none of the answers
What is the centriole's function in the cell?
a. It organizes the cell's contents. b. It stabilizes the nucleus in the middle of the cell. c. It is an anchoring point for the spindle apparatus during nuclear division in animalcells d. It is an anchoring point for the spindle apparatus during nuclear division in plantcells.