What is the role of RPA in eukaryotic recombination events?
A. It introduces single-strand breaks in the chromosome.
B. It degrades the 5'-ending strand to create 3'-ending single-strand overhangs.
C. It is a helicase that assists in separating the DNA strands at the site of breakage.
D. It is a single-strand DNA binding protein that coats the 3'-ending single-strand overhang.
E. It is a RecA-class recombinase that mediates strand invasion.
D
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In all organisms, active transport across a membrane requires
A) equal concentrations of ions on both sides of the membrane. B) a resting potential of 0 mV. C) exergonic movement indicated by the direction of the electrochemical potential. D) an asymmetric distribution of ions across a membrane. E) both choices B and D
Do different types of teeth have different functions?
a. Yes b. No
Which of the following best describes the relationship between DNA, proteins, and RNA?
DNA is transcribed into RNA, then RNA is translated into proteins. DNA is transcribed into proteins, then proteins are translated into RNA. DNA is translated into RNA, then RNA is transcribed into proteins. DNA is translated into proteins, then proteins are transcribed into RNA
In dandelions, female gametophytes and their eggs are ________ because during megaspore generation, homologous chromosomes do not pair and ________ does not occur.
A. haploid; meiosis II B. diploid; meiosis I C. haploid; meiosis I D. diploid; meiosis II