How are T cell receptor (TCR) genes and proteins similar to immunoglobulins?
What will be an ideal response?
Ans: Like immunoglobulin genes, T cell receptor genes have V, J, C, and sometimes D segments. These segments are rearranged and brought together by recombination events that are unique to the lymphocyte to produce specific receptor proteins. The specific organization of individual T cell receptor genes is very similar to that of certain immunoglobulin genes.
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Why are there fewer tRNA anticodons than the 61 needed to match each mRNA codon that codes for an amino acid?
A. There is some flexibility in pairing between the 5' base of the codon and the 3' base of the anticodon. B. There is some flexibility in pairing between the middle base of the codon and the middle base of the anticodon. C. There is some flexibility in pairing between the 3' base of the codon and the 5' base of the anticodon. D. There is some flexibility in pairing between all 3 bases of the codon and all 3 bases of the anticodon.
Darwin's inference that individuals within a population compete for limited resources was based on
which observation(s)?
a. Most organisms produce more than one or two offspring. b. Populations do not increase in size indefinitely. c. Food and other resources are limited for most populations. d. Most organisms produce more than one or two offspring and populations do not increase in size indefinitely. e. Most organisms produce more than one or two offspring, populations do not increase in size indefinitely, and food and other resources are limited for most populations.
Sexual reproduction appears to be absent in bdelloid rotifers. Which of these, if found in this group, would bring into question the idea that they reproduce ONLY asexually?
A) female rotifers with eggs B) significant differences of two different alleles among different populations (one population having mostly allele A and one having mostly a). C) cells in which meiosis occurs D) related groups (not bdelloid rotifers) which reproduce both sexually and asexually.
All of the following are correct about triglycerides, except
A. triglycerides dissolve in nonpolar solvents. B. triglycerides are hydrolyzed by lipases. C. unsaturated triglycerides are solid at room temperature. D. triglycerides are a concentrated source of energy. E. triglycerides are insoluble in water.