Suppose you want to DECREASE the aggressive behavior of an animal, and all you are allowed to use is a nutritional supplement. Which might be a good choice?
a. increase tryptophan
b. decrease thiamine
c. decrease lecithin
d. increase phenylalanine
Answer: a. increase tryptophan
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A common way of studying methylation in cells is to sequence DNA samples before and after modification with sodium bisulfite
The sodium bisulfite deaminates Cytosine residues, generating Uracil residues, therefore resulting in a change in the sequence as compared to the non-modified DNA. Sodium bisulfite does not react with 5-methylcytosine so there will be no change in the sequence of those modified bases. When tumors are sequenced to study methylation patterns and epigenetic control, what would be the best control for sequencing using this technique? A. Non-cancerous tissue DNA from a different individual but from the same organ B. Liver DNA from the same individual that the cancer sample is from C. DNA from non-cancerous tissue from the same individual's organ as the cancer D. A combination of DNA from liver, brain and muscle from the same individual that has the cancer
During contraction of your arm muscle:a
the I band shortens. b. the H zone shortens. c. the A band shortens. d. the I band and the H zone shorten. e. the I band, the H zone, and the A band all shorten.
A population of organisms will not evolve if _____
A) all individual variation is due only to environmental factors B) the environment is changing at a relatively slow rate C) the population size is large D) the population lives in a habitat without competing species present
Which of the following groups include organisms that are a key source of food in all aquatic environments and whose fossilized forms are used as a filter and as a grinding and polishing agent?
A) diatoms B) brown algae C) amoebas D) dinoflagellates