________ attractions are the only ones that all molecules have regardless of what they are composed of.
A. Hydrogen bonding
B. Ion-ion interactions
C. London dispersion forces
D. Dipole-dipole attractions
Answer: C. London dispersion forces
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Using the drawing of mRNA below, choose the letter that best fits the description. Translation is often regulated by sequences in this region. ____
What will be an ideal response?
DNA transfer by conjugation is more efficient in a liquid medium setting, subjected to very mild agitation (stirring), rather than on an agar plate format. Why?
A. Direct cell-to-cell contact is required for this process, and this is more likely to be achieved in the plate format than in the fluid format (especially for relatively non-motile types of bacteria). B. Direct cell-to-cell contact isn't required for this process, so the ability to secrete the DNA into the surrounding fluid medium makes the process more efficient than the dry surface of an agar plate. C. Direct cell-to-cell contact is required for this process, and this is more likely to be achieved in the fluid liquid format than on an agar plate (especially for relatively non-motile types of bacteria). D. Trick question-it can take place with the same degree of efficiency on either format. It doesn't matter!
Shortly before the midpoint of the menstrual cycle, estrogen from the mature follicle triggers a surge in LH, which stimulates which one of the following events?
A) cervix dilation B) uterus contractions C) inhibition of FSH release D) downward movement of fimbriae E) ovulation
Which term below is LEAST like the others?
A. species B. subspecies C. variety D. clone