The results of an experiment on genetic drift on Drosophila melanogaster are illustrated in the accompanying figure. These data show ________
A) the loss of heterozygosity in the population over time
B) the fixation of alleles in the population over time
C) the permanent loss of alleles from the population over time
D) All of the above are accurate.
E) None of the above is accurate.
D
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________ is used to control transcription of some anabolic pathways involved in amino acid biosynthesis.
A. Induction B. Attenuation C. Catabolite repression D. All of the choices are correct.
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.
When a sarcomere is at rest, the myosin binding sites
on actin are blocked by a. calcium. b. troponin. c. tropomyosin. d. the myosin heads. e. ADP.
Homeotic genes
a. cause lethal mutations. b. regulate development of specific body parts c. are found only in fruit flies, where they are responsible for odd placement of appendages. d. produce “fate maps.” e. form as blocks of genes in cells randomly distributed throughout the body.