The interaction of frequent fire and recurrent drought combine to maintain both forest and prairie under identical climatic conditions in the midwestern United States.
a. true
b. false
Ans: a. true
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What is a primary difference between polymerase chain reaction (PCR) and traditional cloning procedures such as those used to clone the human growth hormone gene?
A) PCR and traditional cloning make use of different types of bacteria. B) PCR and traditional cloning make use of different types of vectors. C) PCR uses plasmid vectors, whereas traditional cloning uses bacteria. D) PCR eliminates the need for restriction enzymes, vectors, and cells. E) PCR is more time-consuming, but the purity of the obtained DNA clone is much higher than in traditional cloning.
The R and S genes are linked and 10 map units apart. In the cross R s / r S × r s / r s what fraction of the progeny will be R S / r s?
A) 5% B) 10% C) 25% D) 40% E) 45%
The Krebs cycle occurs in the mitochondria. There are nine biochemical reactions involved in the Krebs cycle, and they are highly ordered. Select the correct order from the following choices. (Note: These are abbreviated and do not show NAD, ADP, ATP, or FAD.)
A. acetyl-CoA joins the Krebs cycle and unites with oxaloacetate ? which forms alpha-ketoglutarate ? forming citrate ? which forms succinyl-CoA ? which forms succinate ? which forms fumarate ? which forms malate ? which forms oxaloacetate B. acetyl-CoA joins the Krebs cycle and unites with oxaloacetate ? forming citrate ?which forms alpha-ketoglutarate ? which forms succinyl-CoA ? which forms succinate ? which forms malate ? which forms fumarate ? which forms oxaloacetate C. acetyl-CoA joins the Krebs cycle and unites with oxaloacetate ? forming citrate ? which forms beta-ketoglutarate ? which forms succinyl-CoA ? which forms succinate ? which forms fumarate ? which forms malate ? which forms oxaloacetate D. acetyl-CoA joins the Krebs cycle and unites with oxaloacetate ? forming citrate ? which forms alpha-ketoglutarate ? which forms succinyl-CoA ? which forms succinate ? which forms fumarate ? which forms malate ? which forms oxaloacetate
________ provides the energy required for voluntary muscle contraction in an individual's body
Fill in the blank(s) with correct word