Which of these structures is not likely to contain significant amounts of aerenchyma tissue?
A. water lily leaves
B. rice roots
C. cypress "knees"
D. mangrove pneumatophores
E. coconut tree roots
Answer: E
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A mutation causes a G to be inserted after the first base of the codon for tryptophan. How will this affect the growing polypeptide chain?
A) It will not be affected. B) Elongation will stop prematurely. C) There will be a single amino acid substitution. D) The reading frame will be shifted to the left, and the wrong amino acids will be added from this point on. E) None of these
During which of the following stages of meiosis does the cell contain the LEAST amount of DNA?
A. telophase II B. prophase II C. anaphase I D. prophase I
Polymers of carbohydrates and proteins are all synthesized from monomers by:
a. the joining of monosaccarides b. hydrolysis c. dehydration reactions d. ionic bonding of monomers e. cohesion
What is the function of a vesicle?
What will be an ideal response?