The radioisotope 14C can be used as a research tracer because it ____.
A. decays to 12C
B. has a different number of protons than 12C
C. has fewer neutrons than 12C
D. behaves the same chemically as 12C
E. has six carbons and six neutrons
Answer: D
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Which of the following is notusually involved in the processing of primary mRNA transcripts?
A. addition of multiple adenosines to the 3' end B. covalent joining of exons C. methylation of nucleotides at the 5' end D. insertion of intron sequences
Enrique was working with chemicals in a paint factory and suddenly lost the ability to detect odors. Could this loss have anything to do with a failure in the thalamus?
What will be an ideal response?
Addition of the short polypeptide ________ targets proteins for destruction
Fill in the blank with correct word.
A phylogenetic tree constructed using sequence differences in mitochondrial DNA would be most valid for discerning the evolutionary relatedness of _____
A) archaeans and bacteria B) fungi and animals C) chimpanzees and humans D) sharks and dolphins