Dandelions in a lawn that is mowed have short flower stalks, whereas those in a field have tall flower stocks. This illustrates
A) convergent evolution.
B) natural selection.
C) artificial mutation.
D) artificial selection.
E) inheritance of acquired characteristics.
B
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The human leukocyte antigen spans about 4Mbp on human chromosome 6
Indicate whether the statement is true or false.
Which component of the vestibular system would most likely be impacted by space travel?
A. rotation of the head B. acceleration C. orientation to gravity D. rotation of the head and acceleration
Which is a monomer?
a. chitin b. cellulose c. amylose d. sucrose e. glucose
Fire and Mello studied the effect of RNAs made from plasmids on gene expression in the nematode C. elegans. The results from the two experimental treatments and the control are shown below. What can be concluded from these results?
A. The labeled probe detects RNAs other than mex-3. B. Double-stranded RNA degrades more mex-3 mRNA than antisense RNA. C. The injection procedure results in degradation of all mex-3 mRNA. D. Antisense RNA degrades more mex-3 mRNA than double-stranded RNA.