What happens to the entropy of two atoms when a covalent bond forms between them?
A. The entropy of both atoms decreases.
B. The entropy is unchanged.
C. One atom passes its entropy to the other.
D. The entropy of both atoms increases.
E. Entropy is formed as heat.
Answer: A
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Adaptive radiation is best described as the
A. existence of groups of closely related species recently evolved from a common ancestor. B. existence of groups of distantly related species recently evolved from a common ancestor. C. existence of groups of closely related species recently evolved from different ancestors through hybridization. D. existence of individuals of closely related species that originated in different areas within diverse habitats, but that have rejoined as a single species.
Crossing over mixes up _____
a. chromosomes that are not homologous pairs b. alleles on homologous pairs c. zygotes d. gametes e. sister chromatids
In older stems and roots, a complex dermal tissue called ____ replaces the epidermis
a. endoderm b. periderm c. mesophyll d. cortex e. lignin
Why is the velocity of blood flow lowest in capillaries?
a. Capillaries are far from the heart, and blood flow starts to slow as it moves away from the heart. b. The systemic capillaries are supplied by the left ventricle, which has a lower cardiac output than the right ventricle. c. The total surface area of capillaries is larger than the total surface area of the arterioles. d. The capillary walls are not thin enough to allow oxygen to exchange with the cells. e. The diastolic blood pressure is too low to deliver blood to capillaries at a high flow rate.