Which of the following is not true of nucleic acid and protein structure?
A. Nucleotides are connected through phosphodiester bonds.
B. Both proteins and nucleic acids are unbranched polymers.
C. When several nucleic acids are joined together, a polypeptide is formed.
D. The chemical composition of a nucleic acid helps determine its structure.
E. The chemical composition of a protein helps determine its structure.
Which of the following is not normally a component of a ribonucleotide?
A. a phosphate group
B. a ribose
C. uracil
D. thymine
E. adenine
The difference between a nucleotide and a nucleoside is the presence of which of the following?
A. a phosphate group
B. a pentose sugar
C. a hydroxyl group
D. a nitrogenous base
E. an amino group
In order to prove genetic recombination occurred through material (DNA) exchange between homologous maize (corn) chromosomes, Harriet Creighton and Barbara McClintock:
A. stained individual chromosomes to see banding, and then observed segregation of bands.
B. observed specific morphologic features of one chromosome being traded with its homolog.
C. created mutations of chromosomes via irradiation and observed transfer of damaged DNA between homologs.
D. labeled one chromosome with 32P and observed the transfer of radioactivity to the homolog.
A newborn is identified as having sickle-cell anemia. While both parents are healthy, a screening of both parents will most likely reveal:
A. both mother and father are carriers of a mutant chain gene.
B. only one parent has a mutant chain gene since mutation is dominant.
C. both mother and father are carriers of a mutant chain gene.
D. only one parent has a mutant chain gene since mutation is dominant.
E. both parents carry a mutant hemoglobin gene and are highly susceptible to malaria.
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