Based on Charles Darwin's observations in the Galapagos Islands, why did tortoises in the Galapagos Islands have longer necks than tortoises in dry lowlands?
What will be an ideal response?
Those with longer necks could reach more leaves and access more food than those with shorter necks
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If cell walls or are not perforated,
a. xylem and phloem will not be able to function as vascular tissue. b. gas exchange will not occur across the stomata. c. water will not enter the epidermal cells of the root. d. the terminal bud will not cause the stem to elongate. e. all of these will occur.
Triglycerides yield how much more energy, gram for gram, than carbohydrates?
a. twice as much b. three times as much c. four times as much d. one half as much e. about the same amount
Which type of skeleton contains the carbohydrate called chitin
a. exoskeleton of insects, crabs, and lobsters b. hydrostatic skeleton of earthworms c. fluid skeleton of jellyfish endoskeleton of lizards d. appendicular skeleton of humans
Which of the following statements about miRNAs is false?
(a) One miRNA can regulate the expression of many genes. (b) miRNAs are transcribed in the nucleus from genomic DNA. (c) miRNAs are produced from rRNAs. (d) miRNAs are made by RNA polymerase.