How do oxygen molecules travel through a cell membrane?
A) diffusion
B) active transport
C) carrier proteins
D) endocytosis
Answer: A
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We refer to the DNA code as being redundant or repetitive. This means that
a. each triplet codes for one amino acid. b. some codons code for the same amino acid. c. one codon codes for one amino acid. d. each triplet codes for a different amino acid. e. a single triplet may code for more than one amino acid.
NADPH is produced by
A. neither the light reactions nor the Calvin cycle. B. the Calvin cycle alone. C. light reactions alone. D. both light reactions and the Calvin cycle. E. NADPH production is not a part of photosynthesis.
When a neuron is not being stimulated, its
membrane potential is classified as
a. resting potential. b. threshold potential. c. action potential. d. inactive potential. e. inhibitory potential
The distance in the DNA from +1 to the polyadenylation signal for a human gene is 40,000 nucleotide pairs. However, the size of the mature mRNA found associated with a ribosome during translation is 3,000 nucleotides. The most likely explanation for this difference is?
a. a missense mutation in the gene b. a mutation in the AUG codon to CUG c. loss of the 5' cap of the mRNA d. the presence of one or more introns in the gene