What is the best explanation for why the arthropods, such as insects, spiders, and crabs, were the first animals to move onto land?
a. The majority of early arthropods did not have to have a moist environment for their survival.
b. They possessed primitive lungs.
c. They had stout, fleshy fins that allowed them to crawl on land.
d. By chance, they already possessed structures suited to life on land so the transition was easier.
e. When they moved to land, they encountered no predators.
Answer: d. By chance, they already possessed structures suited to life on land so the transition was easier.
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a. prepare for gene extractions b. determine gender c. determine which genes are on which chromosomes d. separate DNA into its component parts e. diagnose or rule out certain genetic disorders
Catabolic pathways that break down complex substances into more usable units are usually regulated in response to the
A) end products of the pathway. B) levels of the molecule that is to be broken down. C) other metabolites that are limiting. D) levels of enzymes in the pathway.
In his experiments with pea plants, Mendel removed
which part of the plant to prevent unwanted fertilizations? a. flowers b. petals c. pistils d. stamens e. stigmas
In a small rodent species the C^B C^B codes for black fur, the genotype C^W C^W codes for white fur, and the genotype C^B C^W codes for gray fur. This is an example of ____________.
a. pleiotropy b. codominance c. incomplete dominance d. a sex-linked trait