What is RNA interference?
A. When an RNA virus blocks the DNA replication of the host cell.
B. When tRNA attaches to the ribosome and blocks its movement along the mRNA.
C. When small RNAs form double-stranded RNA molecules that can regulate gene expression.
D. When proteins block the transcription of DNA in the nucleus.
Answer: C
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Which of the following can function as intracellular signaling molecules?
A) acylated homoserine lactones B) hydrophilic lipids C) quinones D) proteorhodopsins
Plasmids are short sequences of DNA used as primers in PCR
a. True b. False Indicate whether the statement is true or false
Lipids
a. yield less energy per gram than do carbohydrates. b. include cartilage and chitin. c. include fats consisting of one fatty-acid molecule and three glycerol molecules. d. are composed of monosaccharides. e. are none of these.
Over many generations man has chosen certain desirable characteristics in dogs by allowing dogs possessing those characteristics to reproduce. In this way, 150 breeds of dogs, all the same species, have descended from wolves. This process is referred to as
A. convergent evolution. B. natural selection. C. inheritance of acquired traits. D. artificial selection.