Whose experiments demonstrated that, given the conditions on the primitive Earth, biological monomers could arise spontaneously?
A) Miller and Urey
B) Darwin and Linnaeus
C) Watson and Crick
D) Wallace and Darwin
A
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Why is there a need to produce Okazaki fragments on the lagging strand, but not on the leading strand of DNA?
A. The two parental strands of DNA are antiparallel and DNA polymerase makes DNA in the 5? to 3? direction only. B. It is substantially more efficient to make several shorter strands rather than one longer strand of DNA. C. There is not enough cellular DNA ligase for bonding Okazaki fragments together if they were produced from both parental strands. D. By having one leading strand and one lagging strand the cell can limit the amount of DNA polymerase used for chromosomal replication. E. The leading strand opens first, and so Okazaki fragments are not needed. The lagging strand unwinds second resulting in the need to produce Okazaki fragments.
Each of the cells formed after meiosis I are:
a. diploid. b. tetraploid. c. in synapsis. d. ready to be fertilized. e. haploid.
The primers in PCR are
a. fragments of mRNA. b. designed to base pair with mRNA. c. free nucleotides. d. radioactive. e. none of these
Photorespiration occurs when rubisco reacts RuBP with
A) CO?. B) O?. C) glyceraldehyde 3-phosphate. D) 3-phosphoglycerate. E) NADPH.