The stomach lining is protected by:
a. alkaline mucus and epithelial cells.
b. pepsin and pepsinogen.
c. trypsin and chymotrypsin.
d. bile pigments and bile salts.
e. rugae and gastric glands.
a
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Match each of the proteins involved in DNA replication with its function
a. DNA helicase b. Topoisomerase II c. Single-stranded binding proteins d. DNA polymerase _____ Attaches DNA nucleotides to an RNA primer _____ Unwinds the DNA duplex _____ Relieves the stress on the replication fork caused by unwinding _____ Proofreads the growing DNA strands and replaces mismatched nucleotides _____ Prevents strands of DNA from rejoining after being unwound What will be an ideal response?
We are sending a small number of dogs to colonize a new planet. Through a random selection process,
we end up only with dachshunds and chihuahuas. The subsequent colony of dogs are all small with short legs. This is an example of
a. adaptive radiation. b. punctuated equilibrium. c. genetic drift. d. microevolution. e. mutation.
The trade-off between investments in current reproduction and in growth that promotes future reproduction is referred to as the total cost of what?
A. adaptation B. selection C. reproduction D. genetic change E. fitness
Which chemicals trigger the repeated division of lymphocytes that produce activated B and T cells?
a. interleukins b. complement proteins c. interferons d. histamines e. cytokines