Which of the following is not a typical step in cancer progression?
a. cell proliferation
b. metastasis
c. invasion
d. telomerase inhibition
e. loss of anchorage dependence
Ans: d. telomerase inhibition
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Pea shape is controlled by a gene that specifies an enzyme known as Sbe1 (for Starch-branching enzyme 1). A recessive allele of Sbe1 likely encodes
A) an Sbe1 enzyme with reduced function. B) an Sbe1 enzyme with a new function. C) a different type of enzyme. D) an Sbe1 enzyme with enhanced catalytic activity.
A certain unicellular eukaryote has a siliceous (glasslike) shell and autotrophic nutrition. To which group does it belong?
A) dinoflagellate B) diatom C) gymnamoeba D) foraminiferan E) cellular slime mold
Physician Edward Jenner promoted the use of cowpox, a harmless pathogen related to the dangerous smallpox, as a vaccination to provide patients immunity from future smallpox epidemics. This is an example of
A. active immunity. B. passive immunity. C. an inflammatory response that decreased the IgE production and increased T cells. D. developing high levels of interferon although Jenner did not realize these diseases were viral. E. developing high levels of complement.
The enzyme ________ adds nucleotides of DNA in the ________ direction when DNA is being semi-conservatively replicated.
A. DNA polymerase I, 5' ? 3' B. DNA polymerase I, 3' ? 5' C. DNA polymerase III, 3' ? 5' D. DNA polymerase III, 5' ? 3'