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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Which is NOT true about gene mutations?
a. All are transmitted to the next generation. b. They are rare but their rates can be predicted. c. Those with beneficial effects will be favored by natural selection. d. Many reduce an individual's chance of surviving and reproducing. e. Those with neutral effects neither help nor hurt the individual.
Water moves across the plasma membrane into or out of a cell by osmosis when
A) there is an equal solute concentration on both sides of the membrane. B) water diffuses through a semipermeable membrane toward a higher solute concentration. C) water diffuses through a semipermeable membrane toward a lower solute concentration. D) a high solute concentration opens an aquaporin channel. E) ATP hydrolysis drives aquaporin transport.
Natural selection can maintain genetic variation by favoring heterozygous genotypes. In equatorial Africa, the best genotype to have for hemoglobin is heterozygous (HbA / HbS). In the United States, there is no advantage to the heterozygous genotype. HbA codes for normal hemoglobin, whereas HbS codes for abnormal hemoglobin that causes red blood cells to become distorted in shape (sickle cell). Explain why the heterozygous state is advantageous in Africa, but not in the United States. What has happened to the sickle-cell allele in Africa? What has happened to the sickle-cell allele in the United States?
What will be an ideal response?
Appraise and evaluate the following statement, and cite evidence from the chapter as appropriate: Despite having a closer "outward" appearance to plants in some ways, evidence support fungi as being far more closely related to animals than plants
What will be an ideal response?