Many farms in New England were abandoned in the 1800s as settlers reached the more fertile grasslands of the Midwest. These farms had been planted in different crops, but within five to ten years the farms appeared to have similar herbaceous and small
tree species on them. This is an example of:
A) secondary succession. B) coevolution.
C) primary succession. D) convergent evolution.
Answer: A
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________ is a directional movement in response to a graded chemical stimulus.
Fill in the blank(s) with the appropriate word(s).
Embryonic stem cells derived from blastocysts are pluripotent, and therefore useful in stem cell research because they ________
a. are viable under a wide range of laboratory conditions b. do not replicate and are therefore stable long-term c. can form all cells, tissues, and organs of the human body d. are specialized and therefore arrested in G0 e. function to replace damaged or diseased body parts in adults
Explain how breast cancer diagnosis and treatment has benefited from proteomics and genomic analyses. What will be an ideal response?
Aminoglycosides act through which of the following mechanisms?
A. inhibition of protein synthesis B. disruption of cell wall synthesis C. inhibition of DNA synthesis D. inhibition of mRNA synthesis E. inhibition of nucleotide synthesis