Which of the following genera grow symbiotically within root nodules of legumes as nitrogen-fixing bacteroids?
A. Nitrosomonas
B. Bacteroides
C. Rhizobium
D. Agrobacterium
Answer: C
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How does position effect influence gene expression?
A. Point mutations in promoters frequently occur by this mechanism B. Translocations may result in a promoter that is normally used for one gene now controlling an entirely different gene C. Since this mechanism relies on recombination it relies on the positioning of one allele so that it is under the control of the other allele. D. Translocations always result in a gene being recombined into an area of heterochromatin.
Which of the following gene mutations is least
likely to impact the protein? a. A conservative substitution. b. A non-conservative substitution. c. An amino acid deletion. d. An amino acid insertion. e. All would be the same
A portion of a gene has the following DNA sequence: GAAGGAGTAGCA, which when translated gives the amino acid sequence leucine-proline-histidine-arginine. Assume a mutation causes a C to be inserted into the sequence in between the second A and the second
G. Predict how this would affect the protein produced when it is translated. What will be an ideal response?
In early cell evolution, why would natural selection favor division into equal-sized daughter cells?
a. Splitting into two equal parts is the most energetically efficient method. b. Two daughter cells is the most efficient way to reproduce sexually. c. Splitting into two daughter cells is more efficient for horizontal gene transfer. d. Hypercycles can be maintained by splitting into two.