Who is credited for discovering cells?
A. Anton van Leeuwenhoek
B. Francis Crick
C. Charles Darwin
D. Joseph Farman
E. Robert Hooke
Answer: E
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In a messenger RNA the 3' UTR refers to the region of the mRNA that is
a. before the start codon. b. before the site for initiation of transcription. c. after the stop codon. d. the coding region. e. after the site for termination of transcription.
The source region in the pressure flow explanation of phloem transport is most often the ____
a. root b. flower c. stem d. leaf e. soil
Which of these is true for most water-soluble
hormones? a. They must be transported by specific carriers in the blood. b. They have no trouble entering their target cells. c. They find and react with surface receptor molecules. d. They never elicit the production of a second messenger. e. They trigger gene transcription.
Which of the following limits the use of PCR to detect and isolate genes?
(a) The sequence at the beginning and end of the DNA to be amplified must be known. (b) It also produces large numbers of copies of sequences beyond the 5? or 3? end of the desired sequence. (c) It cannot be used to amplify cDNAs or mRNAs. (d) It will amplify only sequences present in multiple copies in the DNA sample.