what do T regulator cells (TR) do? (cell mediated immunity slide)
What will be an ideal response?
TR react to B-IFN from fibroblasts and suppresses all T cells.
maintains tolerance during pregnancy, after severe burns, trauma, and surgery.
prevents autoimmunity
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When does the small ribosomal subunit bind to the translational complex in eukaryotic cells?
A. It is the first component to bind to the mRNA B. After the initiator tRNA binds, but before the start codon has been found C. After the large ribosomal subunit binds, but before the initiator tRNA binds D. After the start codon has been found by initiator tRNA E. The small ribosomal subunit binds the initiator tRNA and this complex is the first to bind to the mRNA
Nitric oxide in the exhaust of cars and trucks results in
a. photochemical smog. b. industrial smog. c. a thermal inversion. d. none of these. e. all of these.
Organisms such as lizards that need to maintain body temperature through external means do so by
A. shivering to produce heat. B. sunbathing. C. swimming in geothermal pools. D. running frequently to warm up. E. eating large meals to provide calories for heat production.
Figure 13.10
The accompanying illustration shows the F2 phenotypes from a monohybrid cross in snapdragons. What type of inheritance produces such an outcome?
A. Complete dominance B. Incomplete dominance C. Multiple alleles D. Continuous variation E. Epistasis