Which of the following statements describe a reason ribosomal genes are useful for comparing evolutionary relationships among organisms?
A. There are many differences in these genes, even among closely related species.
B. All organisms possess these genes and they can be compared with each other.
C. These are the only genes that have been sequenced for every organism on Earth.
D. Ribosomes of prokaryotes and eukaryotes are identical.
E. It is possible to compare the large subunit genes with the small subunit genes.
B. All organisms possess these genes and they can be compared with each other.
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Chloroplasts
a. have membrane bound nuclei containing DNA. b. evolved from cyanobacteria. c. have been found as symbionts inside mitochondria. d. evolved from photosynthetic eukaryotes. e. are the site of aerobic respiration.
The placenta
a. forms from endometrial and extraembryonic tissues. b. will cover about one-fourth of the inner uterine surface at full term. c. does not normally intermingle fetal blood with maternal blood. d. secretes progesterone and estrogens that maintain the uterine lining during the second and third trimesters. e. does all of these.
In a pedigree chart, a male showing the specific trait
being studied is indicated by a a. darkened square. b. clear square. c. darkened diamond. d. clear triangle. e. darkened circle.
What do you predict would happen if you replace the Lac operator DNA from the Lac operon with the DNA from the operator region from the tryptophan operon?
(a) The presence of lactose will not cause allosteric changes to the Lac repressor. (b) The Lac operon will not be transcribed when tryptophan levels are high. (c) The lack of glucose will no longer allow CAP binding to the DNA. (d) RNA polymerase will only bind to the Lac promoter when lactose is present.