How do greenhouse gases cause climate warming?
A. Solar energy is absorbed by greenhouse gases in the upper atmosphere and re-emitted toward the earth's surface as heat, causing the climate to warm.
B. Greenhouse gases block solar energy from entering the lower level of the atmosphere.
C. Greenhouse gases prevent radiation of infrared energy back into space, trapping the heat near the earth's surface and causing the climate to warm.
D. Infrared energy from space is absorbed by greenhouse gases in the upper atmosphere, which then re-emit the heat toward the surface of the earth, causing the climate to warm.
E. Greenhouse gases absorb solar energy and re-emit it into space before it can reach the earth's surface.
Answer: C
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PCR is a relatively new advance in DNA technology that targets specific sequences in the DNA for removal or replacement.
Answer the following statement true (T) or false (F)
Which RNA molecule carries the sequence of nucleotides that determines the order of amino acids in a protein?
A) transfer RNA B) ribosomal RNA C) messenger RNA D) translator RNA
An organism has been found to contain a defective form of photolyase. What function might be impaired in this organism?
A. Recognition of damaged DNA by the UvrABC complex B. Repair of DNA damage caused by UV light C. Stabilization of single-stranded DNA during DNA replication D. Lengthening of the tips of chromosomes
Which of the following is synonymous with apoptosis?
a. programmed cell death b. the loss of contact inhibition c. programmed cell life d. the gain of contact inhibition