Following double fertilization, the ovule develops into a(n) ____, and the ovary develops into a(n) ____
a. cotyledon; embryo
b. embryo; seed
c. seed; fruit
d. fruit; seed
e. endosperm; embryo
c
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In the last 20 years one concern of scientists who study amphibians is that
A. genetic diversity is being increased too rapidly for proper maintenance. B. the edge effects are causing declines in species numbers. C. DDT is affecting reproduction by thinning the egg membranes. D. populations are diversifying rapidly and speciation is occurring. E. many species are declining or have gone extinct in recent years.
How can one increase the rate of a chemical reaction?
A. Increase the activation energy needed. B. Cool the reactants. C. Decrease the concentration of the reactants. D. Add a catalyst. E. Increase the entropy of the reactants.
Which of the following exhibits an antagonistic relationship?
A) PTH/aldosterone B) TSH/thyroxin C) renin/ANP D) insulin/glucagon
Dalton's Law states that:a
the amount of a gas that diffuses across a membrane depends on the differences in the gas' partial pressure. b. the ability of hemoglobin to bind oxygen depends on the partial pressure of oxygen. c. in a mixture of gases, the total pressure of the mixture is the sum of the pressures of the individual gases. d. pH causes a displacement of the oxygen-hemoglobin dissociation curve. e. as the concentration of chloride ions increases, the ability of hemoglobin to bind carbon dioxide decreases.