Fats are major constituents of
a. proteins.
b. genes.
c. photosynthesis.
d. cell membranes.
e. all of these.
Answer: d
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What is the function of the MutS protein in methyl-directed mismatch repair?
A. To excise the mismatched base pair. B. To find mismatches. C. To directly bind the DNA polymerase. D. To make a cut in the nonmethylated DNA strand. E. To digest the nonmethylated DNA strand.
Nitrogen can be obtained from either organic or inorganic sources.
Answer the following statement true (T) or false (F)
Which ion is required to be present in a significant quantity in order to allow myosin heads to form cross bridges with actin filaments?
a. Calcium b. Hydrogen c. Potassium d. Sodium e. Glucose
Epidermal growth factor is a mitogen, because it stimulates cells to divide
(1) Explain the role of Ras in epidermal growth factor signaling that results in cell division. (2) Design two experiments to prove that Ras is a key player in the EGF-activated pathway. (3) What assay other than cell division could you use to assess whether the EGF-Ras-MAPK pathway has been activated? What will be an ideal response?