Chemicals in tobacco smoke can cause
a. DNA to break into pieces.
b. mispairing of bases.
c. kinking in the DNA molecule.
d. the formation of nucleotide dimers.
e. covalent bonding between adjacent adenine
bases.
B
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In their experiments to identify the transforming principle, Avery, MacLeod, and McCarty used enzymes that break
down ____.
a. protein, DNA, and RNA b. protein and RNA only c. DNA only d. protein, lipids, and RNA
e. lipids and DNA onlyWhat type of cross is used to determine if an individual with the dominant form of a trait is homozygous or heterozygous?
A. double cross B. dihybrid cross C. reciprocal cross D. test cross E. back cross
Which of the following is a characteristic of microRNAs (miRNAs)?
A. MicroRNAs are short RNA molecules. B. MicroRNAs silence the expression of specific mRNAs. C. MicroRNAs are found in plants and animals. D. MicroRNAs are cut by an enzyme called dicer. E. All of the choices are correct.
What are the main steps of biogenesis, in the correct order?
A. Monomers, self-replicating molecules, polymers, first cells B. Self-replicating molecules, monomers, polymers, first cells C. Polymers, monomers, self-replicating molecules, first cells D. Monomers, Polymers, self-replicating molecules, first cells