Which statement does not describe a catalyst?
A) A catalyst will decrease the rate of a reaction.
B) A catalyst may be an inorganic substance.
C) A catalyst is not used up in the reaction.
D) A catalyst may be an organic substance.
E) A catalyst will increase the rate of a reaction.
Answer: A
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In the hypothetical biochemical pathway, P ? Q + R ? S ? T, which step is likely to have evolved first?
A. P ? Q B. R ? S C. Q + R D. S ? T
Allen's rule states that mammals from colder climates have shorter ears and appendages than individuals of the same species from warmer areas. The related Bergman's rule states that mammal body size varies with latitude, with larger body size in populations located closer to the poles and smaller body size in populations located closer to the equator. What can explain both of these rules?
A. Larger bodies can store proportionally more fat as insulation than smaller bodies. B. Heat loss increases as the surface area to volume ratio of the animal increases. C. Smaller bodies can store proportionally more fat as insulation than larger bodies. D. Smaller bodies have a proportionally smaller surface area, and heat radiation increases with surface area. E. Larger bodies have a proportionally larger surface area, and heat radiation varies with volume.
What is the general trend in diversity in vascular plants for the past 145 million years?
What will be an ideal response?
When Louis Kunkel discovered the gene associated with Duchenne's Muscular Dystrophy in the 1980s, he then
needed to determine _____. a. the MIM number of the gene b. whether the gene was linked to blood type c. how the mutant gene produces the disease phenotype d. whether to use positional cloning to clone the gene e. how many copy number variants were present in the gene