During the early Neogene, temperate woodlands replaced tropical forests. During the late Neogene, these were then replaced by grasslands. Which groups were favored by this transition?
A. Angiosperms
B. Primates
C. Teleost fish
D. Herbivores
E. Insect pollinators
Ans: D. Herbivores
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Which of the following procedures would identify the enzyme that catalyzes the carboxylation of ribulose-1,5-bisphosphate?
A) irradiating a leaf extract with red light B) introducing radiolabeled carbon dioxide into a plant extract and determining which molecules become radiolabeled C) purifying a variety of proteins from plant extracts and testing each protein individually to see if it can carboxylate ribulose-1,5-bisphosphate D) differential sedimentation of a protein extract
Which feature of Archaea is shared with Eukarya but not with Bacteria?
a. the sequestration of DNA into a nucleus b. the common occurrence of introns c. the chemical structure of the cell walls d. the plasma membrane structure e. a genome comprised of a single, circular molecule of DNA
If allele W has a frequency of 0.6, and allele w has a frequency of 0.4, what is the predicted frequency of heterozygous offspring?
a. 0.36 b. 0.24 c. 0.48 d. 0.16
Gene silencing has been effective in mouse models of HD that are heterozygous for the mHTT gene. The results are promising as ________
A) the injection into one side of the mouse brain affected both sides of the brain B) both mHTT and HTT were down regulated C) the study demonstrated the ZFN only targeted the mHTT allele and left the normal HTT expression level unchanged D) the injection into both sides of the mouse brain resulted in reduced mHTT