The idea that older, more stable habitats have greater species richness than habitats subjected to frequent, widespread
disturbances is known as:
a. natural selection.
b. the time hypothesis.
c. island biogeography.
d. the theory of community stability.
e. the disturbance hypothesis
b
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Assume that one allele is completely dominant over the other for the following questions.
a. Two individuals heterozygous for a single trait have children. What is the expected phenotypic ratio of the possible offspring? b. Two individuals heterozygous for two traits have children. What would be the expected phenotypic ratio of the possible offspring? c. Crossing two individuals heterozygous for two traits results in the same phenotypic ratio as for a single trait. Are the genes for these two traits on separate chromosomes or on the same chromosome? Explain your answer. (Remember that the gene for each trait is located at a locus, a physical region on the chromosome.) Yes, the traits would be on the same chromosome as the loci are linked.
Which of the following sequences accurately describes the series of structures through which air passes through on the way into the mammalian lung?
A. pharynx ? larynx ? trachea ? bronchi ? bronchioles ? alveoli B. larynx ? pharynx ? trachea ? bronchi ? bronchioles ? alveoli C. pharynx ? trachea ? larynx ? bronchi ? bronchioles ?alveoli D. bronchi ? bronchioles ? pharynx ? larynx ? trachea ? alveoli E. alveoli ? bronchioles ? bronchi ? trachea ? larynx ? pharynx
To facilitate respiration, birds have extensions of their lungs called __________, which reach into all
parts of their bodies. a. tracheal tubes b. spiracles c. air bladders d. parabronchi e. air sacs
Polar molecules cannot pass across a plasma membrane through the lipid bilayer because they are not soluble in lipids
Indicate whether the statement is true or false