Where does crossing over occur in meiosis?
a. prophase I
b. metaphase I
c. anaphase I
d. telophase I
a. prophase I
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The sequence of a promoter constitutes the most basic mechanism of transcription regulation because:
A. promoters are always bound by activators. B. RNA polymerase has differential affinities for different sequences that correlate with the efficiency of transcription. C. promoters are always bound by repressors. D. the expression levels of different housekeeping genes are always identical.
The first part of the large intestine is the cup-shaped ________
a. cecum b. appendix c. transverse colon d. ascending colon
As the Baby Boomer generation ages, more and more joint replacement surgeries take place each year. Hip replacement surgery is the gold standard of all joint replacement surgeries, with many patients able to walk just a few hours after surgery and return home the very next day. In contrast, knee replacement surgery usually requires hospital stays of several days, followed by weeks to months of physical therapy. What best explains why the recovery after hip replacement surgery is so much faster than after knee replacement surgery?
A. The hip joint is more superficial and more accessible to surgeons than the knee joint. B. The hip only moves in one direction, and recovery of one motion is easier than recovering movement in many directions. C. The upper end of the thigh bone has less overall surface contact with the hip bone than its lower end has in the knee with bones of the lower leg. D. The knee joint is stabilized by many more structures (many of which have to be cut) than the hip joint. E. The knee is a type of combination joint, which are difficult to replace. Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? Gather Content · What do you know about the structure of the knee and hip? What other information is related to the question? Choose Answer · Given what you now know, what information 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?
One of the reasons that pufferfish are a good species to compare to humans is because
A. they are so distantly related that it's easy to distinguish mutually conserved sequences. B. it is so easy to hybridize the two and investigate the consequences. C. they have been separated for so many millions of years and yet the gene sequence is almost identical. D. of the rapid response time in pufferfish to artificial selection. E. the introns are often identical.