Sperm find their way to the archegonium
(a) by swimming.
(b) due to a chemical gradient diffusing from the archegonium.
(c) as a result of sucrose being released during the breakdown of the neck canal cells of the archegonium.
(d) by all of the above.
(d) by all of the above.
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Which one of the following is the portion of the forebrain that regulates the endocrine system and body temperature?
A. cerebrum B. thalamus C. limbic system D. hypothalamus
The diversity of terrestrial vascular plants has increased almost continuously since the ____ period
a. Devonian b. Ordovician c. Cambrian d. Silurian e. Proterozoic
You are studying genes in yeast and find that the genes can be placed into four groups that tend to be inherited together. From this you can conclude that yeast
A. have four chromosomes. B. have four loci. C. have four alleles. D. have four genes. E. produce four cells during meiosis.
A limitation of examining Ka/Ks ratios is that:
a. they are sensitive to demographic changes. b. they cannot be used in introns. c. they can only detect positive selection. d. they cannot detect drift. e. None of the above.