Plasmid vectors often contain ________ genes that can be used to screen for recombinants.
A. antibiotic resistance
B. insertion sequence
C. metabolic activation
D. promoter/operator
Answer: A
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The difference in "sensation" and "perception" when referring to a stimulus lies in
a. the type of receptor stimulated. b. understanding the significance of the stimulus. c. the number of receptors that depolarize. d. feeling exactly what is happening at the site. e. responding to the stimulus.
Mutation is the only evolutionary mechanism that _____
A) does little to change allele frequencies B) is more important in eukaryotes than in prokaryotes C) happens in all populations D) has no effect on genetic variation
__________cells function when dead
A. Parenchyma B. Sclerenchyma C. Collenchyma D. Phloem
In a strand of RNA, how are adjacent nucleotides connected?
A) The phosphate group of one nucleotide is linked to the phosphate group of the adjacent nucleotide. B) The sugar of one nucleotide is linked to the phosphate group of the adjacent nucleotide. C) The nitrogenous base of one nucleotide is linked to the nitrogenous base of the adjacent nucleotide. D) The nitrogenous base of one nucleotide is linked to the phosphate group of the adjacent nucleotide. E) The nitrogenous base of one nucleotide is linked to the sugar of the adjacent nucleotide