Natural selection acts upon the ____ to create microevolutionary change
a. alleles in the gene pool of a population
b. genotypic frequencies of a population
c. alleles of an individual organism
d. allele frequencies in a population
e. phenotype of an individual organism
ANSWER: e
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Which of the following characteristics is unique to all animals?
Which of the following statements is NOT a
possibility even though the phylogenetic lineages for hominins are not definitive? a. Homo preceded Australopithecus. b. Homo sapiens is the most recent. c. Australopithecus is probably more ancient than Homo. d. Homo erectus preceded Homo sapiens. e. Homo and Australopithecus may have evolved at the same time.
During convergent extension,
A) cells on the opposite side of the embryo follow converging developmental pathways leading to bilateral symmetry. B) the cells of the neural folds adhere to one another to complete the neural tube. C) the cells of a tissue layer reorganize, forming a narrowed, elongated sheet. D) the dorsal-ventral axis is established. E) cell adhesion molecules are expressed, causing the eight blastomeres to adhere tightly to one another.
Enzymes can lower the activation energy of a chemical reaction by
A) stabilizing the transition state. B) properly positioning reactants. C) properly positioning reactants and stabilizing the transition state. D) raising the temperature so that reactants collide more forcefully. E) properly positioning reactants and raising the temperature so that reactants collide more forcefully.