Which condition would be most likely to cause stomata to open?
A) high levels of carbon dioxide in a leaf
B) hot, dry weather and strong winds
C) sunrise on a clear morning
D) a cool night setting in
Answer: C
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An sRNA is isolated from a bacterial cell. What would you do to determine whether it is a cis-encoded or a trans-encoded sequence?
A. Analyze the molecular position of hydrogen atoms in the sRNA nucleotides. B. Determine whether the sRNA binds to mRNA or to tRNA. C. Identify whether or not the sRNA sequence is complementary to the coding strand of mRNA gene target. D. Find out if the sRNA acts as a transcriptional or as a translational inhibitor.
Horizontal gene transfer is less prevalent in eukaryotic species because
A. of the presence of organelles in the cells of eukaryotic species. B. of the multicellularity in eukaryotic species, which is lacking in prokaryotic species. C. eukaryotic species reproduce by sexual reproduction. D. of multicellularity and sexual reproduction. E. of the presence of organelles and multicellularity.
The graph below represents the results of an experiment looking at mate preference in female
black widowbirds. The researcher used three groups of male birds: one with artificially
shortened tails, one with artificially lengthened tails, and the control group with unaltered tail
lengths.
Some cases of male infertility are due to immature sperm or sperm that cannot readily penetrate an oocyte. For these individuals, fertilization can still be accomplished using
A) CVS. B) IVF. C) ICSI. D) GIFT.