The primary component making up the cell walls of bacteria is
A. peptidoglycan.
B. glucose.
C. All answers are correct.
D. cellulose.
E. chitin.
Answer: A. peptidoglycan.
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Without the higher rates of transpiration exhibited by angiosperms:
A. many tropical regions would have higher temperatures and lower rainfall. B. many tropical regions would have lower temperatures and lower rainfall. C. many tropical regions would have lower temperatures and lower rainfall. D. many tropical regions would be deserts.
Match the following items with the correct phrases.
_______1. The “building blocks” are held together by glycosidic bonds. _______2. Composed of “building blocks” that contain phosphorous. _______3. Polymers that are composed of amino acids. _______4. Enzymes are examples. _______5. Cellulose, glycogen, and starch are examples. _______6. The “building blocks” are held together by peptide bonds. a. polypeptides b. polysaccharides c. nucleic acids d. substrates
Using the analogy of a 12-hour geologic time
clock a. prokaryotes appear shortly after 5 a.m. b. eukaryotes appear at 9 a.m. c. dinosaurs appear at 10 a.m. d. early fishes appear at 11 a.m. e. the first humans appear at 11:59 a.m.
Why don't the grafted hybrids produce apples with a blend of traits from the scion and the rootstock?
A) The rootstock suppresses activation of the scion genes, which alters fruit production. B) The rootstock is unable to perform photosynthesis and so can't produce fruit. C) Transplanted nuclei from scion cells regulate gene expression in the rootstock. D) The rootstock regulates gene expression in the scion but contributes no genetic information for fruit production.