Consider a biochemical pathway that branches to form two different products. If the end product of one of the branches is present in a large amount, at what point would the pathway be regulated to ensure adequate production of the end product of the alternative pathway while slowing or stopping production of the product already present in excess?
A. At the last step in the pathway to the product in excess
B. At the point where the two pathways branch
C. At the last step in the pathway to the alternative product still needed
D. At the very first step in the entire pathway
Answer: B
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Complex organisms can be characterized as having:
A. a small genome with few genes. B. a small genome with many genes. C. a large genome with few genes. D. a large genome with many genes. E. None of the answer options; there is no correlation between the complexity of an organism and these characteristics.
Pure-breeding individuals always have the ____________________ genotype
Fill in the blank(s) with correct word
DNA is different from RNA in that
A) RNA contains an additional oxygen atom on the ribose sugar. B) RNA is made up five bases, whereas DNA is made up of four. C) RNA cannot exist as a double helix. D) in general, RNA molecules are longer than DNA molecules. E) All of these statements are true.
Why might Neanderthals have been more affected by changes in food sources than H. sapiens?
A. Neanderthals were primarily meat eaters. B. Neanderthals had no ability to store food. C. Neanderthals had no tools with which to process food. D. Neanderthals could digest a limited number of proteins. E. Neanderthals required a greater number of essential amino acids.