Essential organic substances that are used in only tiny amounts by the body are called
A. hormones.
B. trace elements.
C. minerals.
D. vitamins.
Answer: D
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Following genetic recombination, ____
a. the bacterial cell is unable to divide b. the bacterial cell is no longer able to replicate its DNA c. the bacterial cell is a partial haploid d. any remnants of DNA that did not contribute to the genetic recombination form plasmids e. all progeny of the recombinant cell contain the new gene combination
Which Calvin Cycle products are used in the light reactions?
a. G3P, ATP, and NADPH. b. O2, water, and ATP. c. ADP, Pi, and NADP+. d. electrons from CO2. e. protons and Pi.
Luteinizing hormone is considered a gonadotropin because of which one of the following reasons?
A) It stimulates the growth and development of gonads, but only in females. B) It stimulates the growth but not the development of gonads in males. C) It promotes the growth of reproductive organs in both males and females. D) It functions to complement the activity of TSH. E) It triggers the production of gonadotropin hormones.
The following steps occur during multiplication of retroviruses. Which is the fourth step?
A) synthesis of double-stranded DNA
B) synthesis of +RNA
C) attachment
D) penetration
E) uncoating