In meiosis II cytokinesis results in the production of
A. two haploid daughter cells.
B. four diploid daughter cells.
C. four haploid daughter cells.
D. two diploid daughter cells.
E. one daughter cell identical to the parent cell that underwent meiosis.
C. four haploid daughter cells.
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Sidney Brenner found bacteriophage T4 point mutants in which a protein was prematurely terminated. The premature termination point of the protein was different in different mutants
When he determined where the protein synthesis terminated for each mutant, in every case the next amino acid of the protein would have been a glutamine, lysine, glutamic acid, tyrosine, or serine. What is the unique similarity of these amino acids or their codons that would play a role in the premature termination of translation in the mutant protein gene? A. Each of the amino acids has an R-group containing an amine, hydroxyl, or carboxyl group. B. Each of the codons for these amino acids contains either U or G. C. Each of the codons for these amino acids could be changed to UAG with a single nucleotide mutation. D. Each of the amino acids is polar and charged.
Laboratory diagnosis of T. gondii is confirmed by:
a. Giemsa stain. b. tissue culture. c. serologic testing. d. Western blot.
Some deer mice are physiologically adapted to live at high altitudes because of the following:
a. adults maintain fetal forms of hemoglobin. b. mutations in hemoglobin that increase its oxygen-binding affinity. c. mutations in myoglobin that increase its oxygen-binding affinity. d. mutations that increase heart rates. e. mutations that decrease heart rates.
In the United States, what fraction of fresh
water taken from the environment is used to irrigate agricultural fields? a. 0. b. 20. c. 40. d. 60. e. 80.