In the construction of food webs, much information can be obtained through simple observation of feeding relationships within communities. Which of the following types of food web could you construct from such observations, without further measurement or experimentation?
A) connectedness web
B) energy flow web
C) functional web
Ans: A) connectedness web
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Rotifers obtain their food by the action of
(a) tentacles. (b) cilia on the wheel organ. (c) a muscular pharynx. (d) pseudopodia.
Which of the following methods is used to amplify RNA sequences?
A. PCR with RNA primers that anneal to repetitive DNA sequences B. reverse transcriptase-PCR using DNA primers C. quantitative PCR using RNA primers D. RNA polymerase I with DNA primers E. All of these choices are correct.
In which cells do erasure and re-establishment of imprinting marks typically NOT occur?
A. Nurse cells B. Sperm cells C. Oocytes D. Somatic cells
A nucleotide is composed of a(n) _____.
a. glycerol, a nitrogen-containing base, and a five-carbon sugar b. amino group, a nitrogen-containing base, and a five-carbon sugar c. phosphate group, a nitrogen-containing base, and a hydrocarbon d. phosphate group, a nitrogen-containing base, and a five-carbon sugar e. sulfhydryl group, a nitrogen-containing base, and a five-carbon sugar