Based on the phylogenetic tree shown, which of the following is a correct statement of evolutionary relationships?
A. A snake is equally related to a bird and a
crocodile.
B. A snake is more closely related to a
crocodile than to a turtle.
C. A snake is more closely related to a
crocodile than to a bird.
D. A snake is more closely related to a bird
than to a crocodile.
E. A snake is more closely related to a frog
than to a human.
A
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Which of the following is not a reason why gene regulation in prokaryotes is simpler than in eukaryotes?
A. Prokaryotic DNA is not packaged in chromosomes. B. Prokaryotic DNA is not sequestered in the nucleus. C. Processing of mRNA does not occur in prokaryotes. D. Prokaryotic mRNA travels rapidly from the nucleus. E. Transcription and translation are not separate processes in prokaryotes.
In Drosophila melanogaster, the gene for eye color is located on the X chromosome. The allele for red eye color
(Xw+) is dominant over the allele for white eye color (Xw). You examine a vial of 100 flies that are all offspring from a single genetic cross. You find both red-eyed females and white-eyed females as well as both red-eyed males and whiteeyed males. The genotypes of the parents were ____.
a. Xw+Xw+; XwY b. Xw+Xw; XwY c. XwXw; Xw+Y d. Xw+Xw; Xw+Y e. XwXw; XwY
Why is a pyramid of numbers for a forest sometimes narrow at the bottom?
a. Energy decreases as it passes through each trophic level. b. Energy increases as it passes through each trophic level. c. Individual producers are small and very numerous. d. Herbivorous insects vastly outnumber large producers. e. Large producers vastly outnumber insects.
The work of Beadle and Tatum
1.showed that one gene seemed to affect one enzyme. 2.showed that protein was the genetic material. 3.showed that each gene seemed to affect several enzymes. 4.showed that DNA was the genetic material. 5.showed that each enzyme contained just one polypeptide.