When two species of orchids with different floral anatomy are considered, which type of reproductive barrier is involved?

a. gametic
b. temporal
c. behavioral
d. habitat
e. mechanical


Answer: e. mechanical

Biology & Microbiology

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The smallest blood vessels are __________

a. capillaries b. arteries c. veins d. both arteries and veins

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In humans, males are the ____ sex, and females are the ____ sex

a. autosomal, maternal b. recessive, dominant c. dominant, recessive d. homogametic, heterogametic e. heterogametic, homogametic

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In some cases, inhibitors or activators of enzyme-catalyzed reactions act by ____

a. binding to the substrates b. affecting the supply of ATP c. reversibly binding to an enzyme's allosteric site d. reducing or increasing the concentration of enzymes e. binding to the products

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Amphibian eggs have large amounts of yolk at the __________ pole, and most metabolism takes place

at the __________ pole. a. animal; vegetal b. animal; animal c. vegetal; vegetal d. vegetal; animal e. totipotent; telolecithal

Biology & Microbiology