Bacteriochlorophyll differs from chlorophyll a and b in structure and function. Which of the following statements correctly contrasts these types of chlorophyll?
A) Bacteriochlorophyll has a porphyrin ring, whereas chlorophyll does not.
B) Chlorophyll has a phytol side chain, but bacteriochlorophyll does not.
C) Chlorophyll has a methyl group attached to the porphyrin ring, whereas bacteriochlorophyll has a formyl group.
D) Bacteriochlorophyll has a saturated carbon-carbon bond at one location in the porphyrin ring, whereas chlorophyll does not.
E) both choices A and D correctly contrast these types of chlorophyll.
D) Bacteriochlorophyll has a saturated carbon-carbon bond at one location in the porphyrin ring, whereas chlorophyll does not.
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Plants produce more seeds when they reproduce asexually than sexually. Yet most plants reproduce sexually in nature. What is the probable explanation for the prevalence of sexual reproduction? Sexual reproduction _____
A) is more energy efficient than asexual reproduction B) ensures genetic continuity from parents to offspring C) mixes up alleles contributing to variation in a species D) is not dependent on other agents of pollination
Why is speciation by polyploidy more likely in plants than in animals?
A) Plant gametes can be produced by meiosis from somatic cells that have undergone many rounds of mitosis. B) Plant gametes lack postzygotic isolating mechanisms. C) Plants are sessile and, therefore, are never prezygotically isolated to ensure reproduction. D) Plants are sessile and cannot speciate via dispersal. E) Plants lack the DNA repair enzymes that animals have.
Red blood cells are derived from endoderm.
Answer the following statement true (T) or false (F)
What benefit do animals get from having very long loops of the nephron?
A) They can send more water back to circulation. B) They can excrete more salt. C) They can send more glucose back to circulation. D) They make less nitrogenous waste products.