The various techniques by which scientists manipulate DNA in the lab are termed ________.
A. genetic engineering
B. biotechnology
C. recombinant DNA
D. gel electrophoresis
E. gene probes
Answer: A
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Analysis of the primary transcript for an insulin receptor protein reveals that exon 11 has been removed from the mRNA in skeletal muscle, but not in liver. How does this affect the proteins synthesized in these two types of cells?
A. Translation of the insulin receptor mRNA is inhibited in skeletal muscle. B. Translation of the insulin receptor mRNA is inhibited in the liver. C. The mRNA transcript for the insulin receptor protein will be identical in both the liver and skeletal muscle and so translation occurs in both cell types. D. The insulin receptor in skeletal muscle has a higher affinity for insulin than the receptor in the liver. E. The insulin receptor in the liver has a higher affinity for insulin than the receptor in skeletal muscle.
Chlorophyll is comprised of a central ________ containing a(n) ________ ion and a(n) ________ side chain.
Fill in the blank(s) with the appropriate word(s).
The botulism toxin ____
a. is an endotoxin b. is produced by an extremophile c. may be found as a contaminant in expired food d. is marketed as Botox e. causes muscles to contract
The science of reconstructing an organism's evolutionary history is called systematics
Indicate whether the statement is true or false