The backbone of the DNA and RNA, polynucleotides consist of a repeating pattern of sugars, phosphate, sugar, phosphate
a. true
b. false
Ans: a. true
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The ecological role of nematodes includes: a. population management of diatoms
b. being a scavenger. c. being a key to benthic communities. d. being numerous.
Which of the following statements is true?
a. There is no danger involved in recombinant DNA research in humans. b. There is no danger involved in recombinant DNA research in bacteria. c. There is no danger in releasing recombinant organisms into the environment. d. Stringent safety rules make the use of recombinant DNA research possible. e. It is safe to conduct recombinant DNA research in plants.
An amphipathic molecule has:a
two polar ends. b. two hydrophobic ends. c. a hydrophobic and a hydrophilic portion. d. only one hydrophobic end. e. only one hydrophilic end
The spread of pathogens via contaminated water is an example of which type of transmission?
A) indirect contact B) direct contact C) vehicle D) vector