Question 1

Which of the following are relatively stable acid hydrolysis?

Accepted Answer

A) pyrimidines 
B) purines 
C) dipeptides 
D) polypeptides 
A) pyrimidines 
B) purines 
C) dipeptides 
D) polypeptides

Question 2

Which of the following statements is NOT correct for enzymes that cleave nucleic acids?

Accepted Answer

A) They are of the lyase class of enzymes. 
B) They are called proteases. 
C) They belong to the subclass of acyltransferases. 
D) They are found in all cells for "housekeeping." 
A) They are of the lyase class of enzymes. 
B) They are called proteases. 
C) They belong to the subclass of acyltransferases. 
D) They are found in all cells for "housekeeping."

Question 3

Which of the following is richly associated with eukaryotic chromosomes?

Accepted Answer

A) protein 
B) ribosome 
C) nitrogenous base 
D) cytoskeleton 
A) protein 
B) ribosome 
C) nitrogenous base 
D) cytoskeleton

Question 4

With which base does guanine typically base-pair in a double-stranded nucleic acid structure?

Accepted Answer

A) adenosine 
B) uracil 
C) thymine 
D) cytosine 
A) adenosine 
B) uracil 
C) thymine 
D) cytosine

Question 5

Which of the following is formed when R and K amino acid-rich histones interact ionically with the anionic phosphate groups in the DNA backbone?

Accepted Answer

A) ribosomes 
B) nucleosomes 
C) vacuoles 
D) peroxisomes 
A) ribosomes 
B) nucleosomes 
C) vacuoles 
D) peroxisomes

Question 6

Which of the following are important in the processing of eukaryotic gene transcripts into mature messenger RNAs for export from the nucleus into the cytoplasm?

Accepted Answer

A) snRNAs as snRNPs 
B) tRNAs 
C) rRNAs 
D) siRNAs 
A) snRNAs as snRNPs 
B) tRNAs 
C) rRNAs 
D) siRNAs

Question 7

Which of the following is NOT necessary for restriction endonuclease mapping of DNA molecules?

Accepted Answer

A) determining the 5'- and/or 3'-ends of the molecule 
B) protease digestion of fragments 
C) hydrolysis with 2 or more endonucleases 
D) knowing where each endonuclease hydrolyzes 
A) determining the 5'- and/or 3'-ends of the molecule 
B) protease digestion of fragments 
C) hydrolysis with 2 or more endonucleases 
D) knowing where each endonuclease hydrolyzes

Question 8

Which of these regions are attached to hnRNAs and mRNAs after transcription has been completed,and are essential for efficient translation and stability of the mRNAs?

Accepted Answer

A) exons 
B) poly(
A) tails 
C) introns 
D) poly(U)tails 
A) exons 
B) poly(
A) tails 
C) introns 
D) poly(U)tails

Question 9

Which of these statements is correct for the DNA double helix?

Accepted Answer

A) The 2 strands are parallel. 
B) The 2 strands are held together by interchain hydrogen bonds. 
C) The 2 strands have non-complementary base pairing. 
D) They are not easily sheared into shorter fragments during isolation procedures. 
A) The 2 strands are parallel. 
B) The 2 strands are held together by interchain hydrogen bonds. 
C) The 2 strands have non-complementary base pairing. 
D) They are not easily sheared into shorter fragments during isolation procedures.

Question 10

Which -OH group in ribonucleotides makes the 3'-phosphodiester bond susceptible to nucleophilic cleavage during alkaline hydrolysis?

Accepted Answer

A) 1'-OH 
B) 2'-OH 
C) 3'-OH 
D) 4'-OH 
A) 1'-OH 
B) 2'-OH 
C) 3'-OH 
D) 4'-OH

Question 11

Which of the following defines the S designation denoted in a 30S rRNA molecule?

Accepted Answer

A) number of sugars 
B) sedimentation coefficient 
C) splicing coefficient 
D) sequence repeats 
A) number of sugars 
B) sedimentation coefficient 
C) splicing coefficient 
D) sequence repeats

Question 12

What is the percentage of adenine in a sample of double-stranded DNA containing 32% cytosine?

Accepted Answer

A) 0% 
B) 18% 
C) 32% 
D) 68% 
A) 0% 
B) 18% 
C) 32% 
D) 68%

Exam 24: Nucleotides and Nucleic Acids

Which of the following are relatively stable acid hydrolysis?

Which of the following statements is NOT correct for enzymes that cleave nucleic acids?

Which of the following is richly associated with eukaryotic chromosomes?

With which base does guanine typically base-pair in a double-stranded nucleic acid structure?

Which of the following is formed when R and K amino acid-rich histones interact ionically with the anionic phosphate groups in the DNA backbone?

Which of the following are important in the processing of eukaryotic gene transcripts into mature messenger RNAs for export from the nucleus into the cytoplasm?

Which of the following is NOT necessary for restriction endonuclease mapping of DNA molecules?

Which of these regions are attached to hnRNAs and mRNAs after transcription has been completed,and are essential for efficient translation and stability of the mRNAs?

Which of these statements is correct for the DNA double helix?

Which -OH group in ribonucleotides makes the 3'-phosphodiester bond susceptible to nucleophilic cleavage during alkaline hydrolysis?

Which of the following defines the S designation denoted in a 30S rRNA molecule?

What is the percentage of adenine in a sample of double-stranded DNA containing 32% cytosine?

The Facts of Life: Chemistry Is the Logic of Biological Phenomena

Water: the Medium of Life

Thermodynamics of Biological Systems

Amino Acids

Proteins: Their Primary Structure and Biological Functions

Proteins: Secondary, tertiary, and Quaternary Structure

Carbohydrates and the Glycoconjugates of Cell Surfaces

Lipids

Lipid Biosynthesis

Membranes and Membrane Transport

The Reception and Transmission of Extracellular Information

Enzymes Kinetics and Specificity

Mechanisms of Enzyme Action

Enzyme Regulation

Molecular Motors

Nutrition and the Organization of Metabolism

Glycolysis

The Tricarboxylic Acid Cycle

Electron Transport and Oxidative Phosphorylation

Photosynthesis

Gluconeogenesis, glycogen Metabolism, and the Pentose Phosphate Pathway

Fatty Acid Catabolism

Nitrogen Acquisition and Amino Acid Metabolism

Structure of Nucleic Acids

Synthesis and Degradation of Nucleotides

Recombinant Dna: Cloning and Creation of Chimeric Genes

DNA Metabolism: Replication, recombination, and Repair

Transcription and the Regulation of Gene Expression

Protein Synthesis

Post-Transcriptional Regulation of Gene Expression

Completing the Protein Life Cycle: Folding, processing, and Degradation

Metabolic Integration and Organ Specialization

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