The ________ help(s) plants retain water
A) hypha
B) cuticle
C) mycorrhiza
D) lignin
B
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Evidence of a direct relationship between genes and enzymes, including development of the one geneone
enzyme hypothesis, came from studies conducted by ____ of arginine biosynthesis in mutant stains of Neurospora.
a. Beadle and Tatum b. Griffith c. Watson and Crick d. Garrod e. Nirenberg and Leder
An organism that can use energy and inorganic substances to produce all the organic material it requires is a(n)
A. consumer. B. decomposer. C. autotroph. D. secondary consumer. E. heterotroph.
Methylene blue
a. is used to kill cells that are moving too quickly to observe. b. detoxifies cells so they are safe to handle. c. is used as food for Physarum cells. d. is a biological stain used to increase contrast of transparent cells.
Which of the following statements is false?
a. In chain elongation, the amino acids are added to the chain according to the codon sequence in the messenger RNA. b. Several ribosomes, called a polysome, can travel along the messenger RNA molecule, translating it at the same time. c. The general shape of transfer RNA molecules is uniform. d. Enzymes found in the ribosome catalyze the formation of the bonds in the new polypeptide. e. None of these is false.