Male deer have large antlers that are used to challenge each other in fights for territory and females. The females of this group actively choose the strongest males. Which type of sexual selection is occurring with the deer population?
A. Stabilizing selection.
B. Negative frequency-dependent selection.
C. Intersexual selection.
D. Intrasexual selection.
E. Intersexual and intrasexual selection are both occurring.
E. Intersexual and intrasexual selection are both occurring.
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Why are apple trees propagated asexually?
a. the process is much easier than growing them from seeds b. it is the only way to grow the same reliable quality of apple c. asexual propagation introduces genetic variation that makes the trees hardier d. asexually propagated apple trees are more disease resistant e. more than one of these is the reason why apple trees are asexually propagated
How does a cDNA library differ from a genomic library? How are cDNA libraries significant to the
production of eukaryotic gene products? What will be an ideal response?
A cell is observed under the microscope. What feature will indicate that it is in anaphase?
A) DNA is elongated, not condensed, and difficult to visualize. B) Two separate nuclear membranes are visible. C) Sister chromatids are separating. D) Centrosomes are just beginning to separate and form the spindle.
In working with a potentially new antibiotic, you are attempting to determine where in prokaryotic translation this antibiotic has its effect. You have determined thus far that it interacts with a translational factor but need to identify which one. If this antibiotic interfered with elongation, which of the following factors could be a potential site of action?
A) IF3 interaction with an aminoacyl tRNA B) EF-Tu placement of N-formylmethionine onto the ribosome C) EF-Tu interaction with an aminoacyl tRNA D) EF-Ts translocation of tRNAs from the A site to the P site E) all of the above