A codon of mRNA consists of three bases that code for an amino acid
Indicate whether the statement is true or false
TRUE
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Glucose
A. is preferentially used over lactose in E. coli as a result of catabolite repression. B. levels are directly sensed via catabolite repression. C. levels are the inverse of cAMP levels. D. levels directly affect the production of lactose dehydrogenase. E. is preferentially used over lactose in E. coli as a result of catabolite repression AND glucose levels are the inverse of cAMP levels.
The half-life of carbon-14 is approximately 5,700 years. How much of an initial 1.0 gram sample of carbon-14 will remain after 11,400 years (two half-lives)?
a. 0.33 grams (33%) b. 0.5 grams (50%) c. 0.25 grams (25%) d. 0.12.5 grams (12.5%)
The cuticle consists of:
a. cellulose. b. lignin. c. hemicellulose. d. starch. e. cutin.
The __________ circuit carries blood from the heart to body tissues, and then returns it to the heart.
Fill in the blank(s) with the appropriate word(s).