A population in which death rates are higher than birth rates, and the prereproductive group is smaller than the reproductive group, is best represented by an age structure diagram with a(n) ________-shape.
A. pyramid
B. urn
C. S
D. bell
E. J
Answer: B
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Individuals in the population grouped
according to levels of maturity define the population's a. carrying capacity. b. age structure. c. density. d. size. e. birth rate
A breeder of cattle has a herd of white cows and a roan bull. Hair color in this breed is controlled by an incompletely dominant gene. The two homozygous forms are either red or white, and the heterozygous is roan. What colors of calves are expected and in what proportions?
A. All white B. All red C. 1/2 white, 1/2 roan D. 1 white, 2 roan, 1 red E. 1/2 white, 1/2 red
The modified amino acid fMet is essential for
A) bacterial translation. B) bacterial transcription. C) eukaryotic transcription. D) eukaryotic translation. E) eukaryotic mRNA processing.
Three major types of RNAs are mRNA, rRNA, and tRNA. For each of the conditions below, predict the consequences in terms of the population of proteins being synthesized in a particular cell and the effects on individual proteins
(a) An acridine dye—induced mutation (adds or deletes single bases in DNA) leads to an mRNA for one protein-producing gene. The condition is heterozygous in the involved cell. (b) A deletion (homozygous) that removes approximately half of the rRNA genes. What will be an ideal response?