An experimental test of the hypothesis to explain the origin of the first organic compounds on Earth might include all of the following sequential steps except
A. inoculating with a few bacteria to get the process started.
B. providing energy with electrical spark discharges.
C. placing this atmosphere over liquid water.
D. assembling an atmosphere with H2, CH4, NH3, and H2S.
E. increasing the temperature of the gases.
Answer: A
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Carotenoids are important to many plants because these pigments are able to
A. remove carbon dioxide from the air. B. absorb wavelengths of light that neither chlorophyll a nor b can absorb. C. absorb water so that hydrolysis can be carried out in the chloroplasts. D. capture UV radiation that is harmful to the DNA in the nucleus of plant cells. E. store electrons for use during the "dark" reaction of photosynthesis.
The individual credited with first observing the cell nucleus was ____
a. Anton van Leeuwenhoek b. Robert Brown c. Matthias Schleiden d. Theodor Schwann e. Rudolf Virchow
What is the sequence of the DNA synthesized in the sequencing reaction?
You performed a Sanger sequencing reaction and obtained the following read. In this figure, A = green, C = purple, G = black, T = red. The height of the peaks is unimportant. The smallest molecule is at the left of the trace.
A) 5' TTTGCTTTGTGAGCGGATAACAA 3'
B) 3' TTTGCTTTGTGAGCGGATAACAA 5'
C) 5' AAACGAAACACTCGCCTATTGTT 3'
D) 3' AAACGAAACACTCGCCTATTGTT 5'
EcoRI and HindIII are
A. DNA polymerases. B. restriction endonucleases. C. ligases. D. reverse transcriptases. E. palindromes.