Which abiotic factor in the illustration would limit the carrying capacity of this environment for fresh water snails in the pond?
A) number of plants growing along the pond's banks
B) population of birds
C) concentration of algae in the upper levels of the pond
D) amount of sunlight reaching the pond
Ans: D) amount of sunlight reaching the pond
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Why do mitochondria and chloroplasts have small genomes?
A. They have small genomes because their bacterial ancestors did. B. They have small genomes because they do not need many genes to function. C. They have small genomes because they lack non-coding DNA. D. They have small genomes because over time, much of their nucleic acid has migrated to the host cell nucleus.
If a population satisfies the Hardy-Weinberg equilibrium model, what can you assume about that population?
A. It is relatively small. B. Evolution is occurring. C. Gene flow is occurring. D. Allele and genotype frequencies are stable.
Certain chemicals like DDT undergo biological magnification because
a. reactions within prey convert similar compounds into DDT. b. many smaller prey animals consume DDT as a nutrient. c. consumers store all of the DDT present in the prey they consume. d. more DDT in the environment sticks to larger consumers. e. DDT accumulates in water supplies and larger consumers drink more water.
Transcomplementation is a name sometimes given for a test to see whether a gene from one organism can "rescue" a loss-of-function mutant of a different organism with a homologous gene. To which of the following processes might this term apply?
A) replacement of a nonfunctional globin gene with a globin pseudogene B) substitution of a drought-resistant gene from potato plants with a drought-resistant gene from a cactus species C) introduction of a human WEE1 gene into a yeast culture with wee1- mutants D) replacement of a cdc25– with a cdc13+ gene to rescue a cell cycle dysfunction E) use of Drosophila heat shock gene promoters to regulate heat shock genes in fugu