The development of polymerase chain reaction (PCR) was a watershed event in recombinant DNA technology. What are two characteristics of PCR that make it such an important development?
What will be an ideal response?
One advantage of PCR over bacterial cloning is that exponentially more DNA clones can be made in a shorter time frame. A second advantage is the cost reduction in generating cloned DNA through the use of thermostable Taq polymerase.
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The results of the coccolithophorid experiment done by Riebesell and colleagues showed that:
A. increasing CO2 levels lead to incomplete coccolithophorids. B. increasing pH levels lead to decreasing calcification rates. C. decreasing CO2 levels lead to deformed coccolithophorids. D. decreasing pH levels lead to significantly reduced growth rates. E. None of the answer options is correct.
Answer the following statements true (T) or false (F)
1. Plant behavior is defined as response to stimuli. 2. Plant hormones (growth regulators) can travel from cell to cell within the plant only if they are moved by electrical impulses. 3. Plants grow towards light because they sense a need for light. 4. The production of roots on cuttings of a houseplant is promoted when auxins are applied to the cut ends.
SIV causes symptomless infections in monkeys and apes, yet causes AIDS-like disease in chimpanzees. HIV is closely related to SIV and causes AIDS in humans. Which of the following is the best explanation for these observations?
A. The effects of viruses on different species is random.
B. Chimpanzees and humans have a more recent common ancestor.
C. SIV is most likely latent in chimpanzees.
D. Monkeys, apes, and chimpanzees are all genetically very similar.
E. SIV is most likely lytic in apes and monkeys.
The best explanation for the phenotypic differences between humans and chimps despite the great similarities in their gene-coding sequences is
A. the vast differences in the introns between their genomes. B. differences in gene expression between species. C. the vast differences in exons between their genomes. D. the junk DNA of humans contains important sequences not present in chimps.