A repair enzyme recognizes an incorrect structure in the DNA and directly converts it back to a correct structure. Which of the following DNA repair systems is responsible for the correction?
A. base excision repair
B. direct repair
C. indirect repair
D. nucleotide excision repair
E. methyl-directed mismatch repair
B. direct repair
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Pinworm is a nematode parasite that lives in the human rectum, and causes itching in the anal area. What best explains the itching symptom?
A. Any kind of parasite will naturally irritate the skin. B. The itching induces the person to scratch, helping to spread the parasite to another person. C. The itching is a side-effect when the immune system has successfully attacked the nematode. D. The itching is because of the mismatch between humans and the parasite’s natural host. Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? Gather Content · What do you already know about nematode diseases? Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
Gymnosperms can be both monoecious and dioecious. What does dioecious mean?
a. a sister group to the angiosperms b. diploid egg and sperm join at fertilization to form a tetraploid seed c. male and female sporangia produced by different plants d. having two ovules per scale in the cone
Identical twins arise from a split at which stage?
a. the morula b. the blastula c. two cells d. eight cells e. 32 cells
The logit model assumes what sort of distribution for the unobservables?
A. T-distribution B. Logistic distribution C. Exponential distribution D. Standard normal distribution