What has been detected in meteorites that have fallen to the Earth?
a. organic compounds
b. organic polymers
c. evidence of cells with a nucleus
d. fossilized proto-cells
e. oxygen molecules
a
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To convert a nucleoside into a nucleotide, what moiety must be added?
A. One or more pyrimidine bases B. One or more phosphate groups C. One or more double bonds D. One or more purine bases
A diabetic patient has developed gas gangrene of the right foot. The most likely anaerobe causing this infection is:
a. Clostridium tetani. b. Clostridium perfringens. c. Clostridium botulinum. d. Clostridium difficile.
Multiple effects of a single gene is
a. expressivity. b. penetrance. c. codominance. d. pleiotropy. e. multiple alleles.
Briefly describe the sequence of events that take place in muscle contraction. What will be an ideal response?