The normal form of the p53 gene
A) is a type of proto-oncogene.
B) has been linked to the development of colon cancer.
C) codes for a protein that prevents damaged cells from dividing.
D) is a type of oncogene that causes skin cancer.
E) codes for proteins that stimulate cell growth and adhesion.
C
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Which group of organisms is thought to be responsible for the corrosion of submerged metal structures and oil pipelines?
A) fermentative microorganisms B) acidophilic iron-oxidizers C) sulfate reducers D) hydrocarbon-degrading anaerobes
Which site on the ribosome is never occupied by a tRNA linked to a nascent polypeptide chain?
A. the A site B. the P site C. the E site
What is true of a fossil that is classified as a "transitional form"?
A. It has all of the traits of its ancestors and all of the traits of its descendants. B. It has some of the traits of its ancestors and all of the traits of its descendants. C. It has all of the traits of its ancestors and some of the traits of its descendants. D. It has some of the traits of its ancestors and some of the traits of its descendants.
In skeletal muscle, an action potential leads directly to ________
a. the binding of actin with myosin b. the detachment of troponin from actin c. flexure of the already bound myosin heads d. the release of calcium from the sarcoplasmic reticulum