Which of the following principles is NOT part of Darwin's theory of evolution by natural selection?
A. Evolution is a gradual process that occurs over long periods of time
B. Variation occurs among individuals in a population
C. Mutations are the ultimate source of genetic variation
D. More individuals are born than will survive
E. Individuals that possess the most favorable variations have the best chance of reproducing
Ans: C. Mutations are the ultimate source of genetic variation
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Are all point mutations SNPs?
A. Yes, because SNPs are single base pair changes of the DNA. B. Yes, because SNPs are random in their occurrence. C. No, because SNPs require a certain frequency in the population. D. No, because SNPs are mismatched base pairs.
Cholecystokinin hormone promotes weight loss
1.True 2.False
Which of the following statements regarding cancer risk factors is false?
A) Factors that alter DNA and make cells cancerous are called carcinogens. B) Mutagens are usually not carcinogens. C) X-rays and ultraviolet radiation are two of the most potent carcinogens. D) Eating 20-30 grams of plant fiber daily and reducing the intake of animal fat can reduce your risk of developing colon cancer.
In the sequence of events during translation, what is the next step after an mRNA binds to the ribosome's small subunit?
A) An amino acid from a tRNA in the P site attaches to an amino acid on the tRNA in the A site. B) A tRNA binds to the start codon, and the large ribosomal subunit joins the ribosome. C) A tRNA is released from the E site. D) A tRNA enters the A site of the ribosome. E) The ribosome shifts down the mRNA by one codon.