The point at which one or more leaves attach to the stem of a plant is a
A. petiole.
B. internode.
C. anther.
D. sieve tube.
E. node.
Ans: E. node.
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There is a phenomenon called parental leakage, in which a small amount of the mitochondrial DNA from the father is found in the offspring
If parental leakage is assumed to have occurred throughout human history, how does it change our interpretation of Matthias Krings and Svante Päabo's studies of mitochondrial DNA in specimens of Neanderthals and modern humans? A. If the paternal mitochondrial DNA did show up in the offspring alongside maternal mitochondrial DNA, these would have immediately indicated that the two groups interbred. B. The results would have been exactly the same because researchers were looking at only female modern humans in this study. C. Mitochondrial DNA coming from the father would negate all of the advantages of using mtDNA as the source for genetic information in the first place, so the whole study would be useless. D. The results would have been exactly the same because researchers were looking at only modern humans that were males for this study. This means it wouldn't have mattered if paternal leakage occurred or not.
Large respiratory droplets typically travel no farther from point of release than
A. 3 meters. B. 5 meters. C. 1 meter. D. 20 meters.
An exergonic reaction is considered to be:
a. spontaneous. b. potentially spontaneous. c. endergonic. d. nonspontaneous. e. energy requiring.
For the following gene, which type of regulatory sequence has likely been deleted in mutant 1? Mutant # Deletion Region % Transcription WT None 100% 1 1-200 150% 2 250-400 100% 3 500-800 50% 4 950-1100 0%
What will be an ideal response?