Permanently swollen veins, common in the legs and feet, are known as ________
Fill in the blank(s) with correct word
varicose veins
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GGG and GGC are codons for the amino acid, glycine. A mutation caused the insertion of a cytosine in place of the guanine during DNA replication. Over many generations the DNA changes so that the frequency of GGC is similar to that of GGG. What effect does this mutation have on the population's mean fitness?
A. As the frequency of the GGC codon increases, the population's mean fitness level will remain the same.
B. As the frequency of the GGC codon increases, the population's mean fitness level will initially increase, but once GGC and GGG occur with equal frequency, the mean fitness will decrease.
C. As the frequency of the GGC codon increases, the population's mean fitness level will decrease.
D. As the frequency of the GGC codon increases, the population's mean fitness level will increase.
The energy for translocation during translation comes from
a. formation of the peptide bond. b. breaking of bonds between tRNA and mRNA. c. breaking of bonds between mRNA and the ribosome. d. removal of a tRNA from the E site. e. hydrolysis of GTP.
Impaired vision after a blow to the head implies damage to the vision processing center in the brain. Which region of the brain controls vision?
A. frontal lobe B. parietal lobe C. temporal lobe D. occipital lobe E. brainstem
The cell nucleus likely originated from:
a. a mitochondrion. c. a bacteria. b. an archaea. d. a eukaryote.