In Patagonia, researchers found that the middle part of the intertidal zone was comprised of __________, in both exposed and protected sites.
A) bare rock
B) mussels
C) coralline algae
D) a 50:50 mix of mussels and coralline algae
Ans: B) mussels
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When characterizing DNA gyrase, the Cozzarelli group added a minimal amount of ATP to the reaction tubes containing DNA and gyrase. They did this in order to:
A. confirm that ATP would cause the reaction to reverse and the relaxed DNA would revert to supercoiled form. B. view the incremental increase of supercoiling of plasmid DNA as gyrase changed the linking number by 1 C. view the incremental increase of supercoiling of plasmid DNA as gyrase changed the linking number by 2 D. view the incremental relaxation of plasmid DNA as gyrase changed the linking number by 1 E. view the incremental relaxation of plasmid DNA as gyrase changed the linking number by 2
Which of the following statements correctly describes a quantitative trait?
A. People who are homozygous for the group of genes associated with skin pigment have either lighter or darker skin than those who are heterozygous for those genes. B. The alleles of the gene for red hair color is masked by the gene for brown hair color. C. A person heterozygous for dwarfism will always have the dwarf phenotype. D. A woman who has one allele for color blindness will not be color blind, but a man who has one allele for color blindness will be color blind. E. 25% of the offspring from a cross of two fruit flies that are heterozygous for curly wings will have curly wings.
The antigen-binding region of an antibody is formed by the
A) constant region composed of a heavy chain and a light chain. B) variable region composed of two heavy chains. C) variable region composed of two light chains. D) variable region composed of a heavy chain and a light chain. E) constant region composed of two light chains.
The epilimnion of a lake is located below the hypolimnion.
Answer the following statement true (T) or false (F)