The enzyme salivary amylase begins the digestion of ________ while food is still in the mouth
a. lipids
b. protein
c. all of the choices
d. starch
d
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A region of a protein that folds in a similar way independently of the rest of the protein is referred to as a folding ____
Help with this one please?
Today, the fossil record
A. can be dated only with one layer in relation to older layers below and younger layers above, no actual dates can be estimated. B. can be dated reasonably well only with uranium-238. C. can be dated reasonably well using a variety of radioactive isotopes with known half-lives. D. can be dated precisely, to within a single year, using radioactive isotopes. E. can be dated precisely, to within a single year, using DNA hybridization.
If an organism with 64 chromosomes mates with a closely related organism with 62 chromosomes, the most likely
result will be ____.
a. many unhealthy offspring due to hybrid breakdown b. many unhealthy offspring due to hybrid inviability c. no offspring due to hybrid sterility d. sterile offspring due to hybrid inviability e. sterile offspring due to hybrid sterility
Which of the following leads to the occurrence of vertebrate sense organs?
A. both adrenal medullary cells and sympathetic neurons derive from the neural crest B. neural crest cells form both neurons that carry messages and cartilaginous bars C. the neural crest and associated sensory ganglia D. formation of the endoderm E. formation of the autonomic nervous system