The N terminal in a protein
A. is the end characterized by a free carboxyl group.
B. is the end characterized by a free amino group.
C. is typically found in the middle of a protein.
D. refers to that area of a protein that is bound to another protein.
B
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The term filterable viruses was coined by
A. Beijerinck. B. Iwanowsky. C. Twort. D. d'Herelle.
Answer questions 120–124 in reference to the five items listed
below. a. 12 b. 23 c. 24 d. 46 e. 47 D 120. How many chromosomes does each somatic cell have in a human male who has two X chromosomes? D 121. Following a gene duplication event involving only five loci, how many chromosomes will a human female have? D 122. How many chromosomes are present in the somatic cells of a child born with Down syndrome (trisomy 21)? D 123. How many chromosomes are present in each cell of the germ cell line for a tetraploid species where its normal complement of chromosomes is 48? D 124. The normal sperm cell of species X carries 11 chromosomes. Following nondisjunction in the formation of secondary spermatocytes and their subsequent fertilization of normal ova, some of the zygotes will have 21 chromosomes, others will have 22, and the remainder will have how many chromosomes?
Evolution of a new species occurs
A. in sexually-reproducing organisms. B. in asexually-reproducing organisms. C. typically over long periods of time. D. All answers are correct. E. allopatrically and sympatrically.
In general, each species of fruit fly in the Hawaiian archipelago is restricted to a single island. One hypothesis to explain this pattern is that new species formed after a small number of flies colonized each new island
This mechanism of speciation is called A) artificial selection. B) genetic equilibrium. C) assortative mating. D) the founder effect. E) sexual selection.