Which is not used as a chemical preservative in food?
A. Iodine
B. Sulfite
C. Salt
D. Organic acids
E. Ethylene oxide
Answer: A
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In the accompanying figure, ionic bonds would form between the R groups of which amino acids?
a. 1 and 3
b. 2 and 4
c. 3 and 5
d. 4 and 6
e. 3 and 6
A researcher wants to create a mouse model for a disease, to allow her team to study possible therapies. The disease is known to be caused by a small deletion that removes a certain gene. Which type of mouse would be the best choice for this purpose?
A. Conditional knockout mouse activated by a drug B. Tissue-specific gene knockout C. Knockout mouse D. Mutant derived by traditional forward genetics screen E. Knockin mouse
Which of the following features is NOT associated with Alzheimer's disease?
A. Neurofibrillary tangles surround the nucleus of the neural cells. B. The most common cause of dementia in older adults. C. Plaques accumulate along the axons of the neurons in the brain. D. A loss of reasoning and memory. E. All of these are features of Alzheimer's disease.
Which of the following statements best discriminates among phylogenetic trees based on a maximum likelihood approach?
A. The preferred tree requires the most mutations to occur. B. The preferred tree gives the lowest probability of producing the observed data. C. The preferred tree requires the fewest mutations to occur. D. The preferred tree gives the highest probability of producing the observed data.