Question 1

The supercoiling of double-stranded circular DNA can be removed by cleaving a single phosphodiester bond on only one strand (nicking).

Accepted Answer

A) True 
 B)False

Question 2

The abbreviation pdAp indicates

Accepted Answer

A) 5',3' deoxyadenylate. 
B) 3',5' deoxyadenylate. 
C) 5' deoxyadenylate. 
D) 3' deoxyadenylate. 
E) None of the above. 
A) 5',3' deoxyadenylate. 
B) 3',5' deoxyadenylate. 
C) 5' deoxyadenylate. 
D) 3' deoxyadenylate. 
E) None of the above.

Question 3

Stem-loop is a type of secondary structure not usually found in

Accepted Answer

A) rRNA. 
B) tRNA. 
C) mRNA. 
D) small RNA. 
A) rRNA. 
B) tRNA. 
C) mRNA. 
D) small RNA.

Question 4

It is possible to synthesize DNA containing specific polynucleotide bases today.

Accepted Answer

A) True 
 B)False

Question 5

DNA wraps around an octamer of histones to form bead-like structures called ________.

Accepted Answer

A) nucleoids 
B) nucleosomes 
C) nucleoli 
D) chromatids 
A) nucleoids 
B) nucleosomes 
C) nucleoli 
D) chromatids

Question 6

About 150 bp of DNA wrap around the histone octamer to form a bead-like structure.The "beads" are separated by about 50 bp of linker DNA.

Accepted Answer

A) True 
 B)False

Question 7

Two DNA sequences,each 48 kb in size,are treated with the same restriction enzyme.There is only one site for this restriction enzyme on each of these sequences.Digests are separated by gel electrophoresis.Sequence A shows ONE band that is 48 kb in size.Sequence B shows TWO bands,one 30 kb and the other 18 kb in size.What can you conclude from these data?

Accepted Answer

A) They are identical sequences. 
B) Both sequences are linear. 
C) Sequence A is circular;sequence B is linear. 
D) Sequence A is linear;sequence B is circular. 
A) They are identical sequences. 
B) Both sequences are linear. 
C) Sequence A is circular;sequence B is linear. 
D) Sequence A is linear;sequence B is circular.

Question 8

Which is not true of the different conformations of DNA?

Accepted Answer

A) Z-DNA is a left-handed spiral. 
B) A-DNA and B-DNA are right-handed spirals. 
C) A-DNA and Z-DNA segments are limited to short regions of DNA. 
D) Both A-DNA and B-DNA are dehydrated. 
A) Z-DNA is a left-handed spiral. 
B) A-DNA and B-DNA are right-handed spirals. 
C) A-DNA and Z-DNA segments are limited to short regions of DNA. 
D) Both A-DNA and B-DNA are dehydrated.

Question 9

About how many nucleosomes could be made from a DNA strand consisting of 1000 base pairs?

Accepted Answer

A) 5 
B) 50 
C) 500 
D) This is not enough DNA to make even one nucleosome. 
A) 5 
B) 50 
C) 500 
D) This is not enough DNA to make even one nucleosome.

Question 10

Regions of DNA that are most easily unwound have

Accepted Answer

A) about half G and half C. 
B) alternating A and G. 
C) greater G:C content. 
D) greater A:T content. 
A) about half G and half C. 
B) alternating A and G. 
C) greater G:C content. 
D) greater A:T content.

Question 11

The recognition site of some restriction enzymes are shown.Which will produce sticky ends?

Accepted Answer

A) EcoRI G↓AATTC. 
B) SmaI CCC↓GGG. 
C) XhoI C↓TCGAG. 
D) Both EcoRI and XhoI. 
E) All the enzymes shown will leave sticky ends. 
A) EcoRI G↓AATTC. 
B) SmaI CCC↓GGG. 
C) XhoI C↓TCGAG. 
D) Both EcoRI and XhoI. 
E) All the enzymes shown will leave sticky ends.

Question 12

A HATS enzymes reacts with the side-chain of lysine to form the following structure: What effect will the HATS enzymes have on histones?

Accepted Answer

A) No effect,since histones contain few lysine residues. 
B) HATS will increase the affinity of histones for DNA. 
C) HATS will allow for easier unravelling of histone-DNA structures. 
D) HATS activate histones for interaction with mRNA. 
A) No effect,since histones contain few lysine residues. 
B) HATS will increase the affinity of histones for DNA. 
C) HATS will allow for easier unravelling of histone-DNA structures. 
D) HATS activate histones for interaction with mRNA.

Question 13

Which of the following is mismatched?

Accepted Answer

A) rRNA: 80% of cellular RNA. 
B) tRNA: carry amino acids during protein synthesis. 
C) mRNA: stable RNA carrying the coded information from DNA. 
D) Small RNA: catalytic with or without proteins. 
A) rRNA: 80% of cellular RNA. 
B) tRNA: carry amino acids during protein synthesis. 
C) mRNA: stable RNA carrying the coded information from DNA. 
D) Small RNA: catalytic with or without proteins.

Question 14

Five different bases are found in most DNA and RNA molecules.

Accepted Answer

A) True 
 B)False

Question 15

Which is not a difference between RNA and DNA?

Accepted Answer

A) The sugar ring of RNA is more oxidized than that in DNA. 
B) RNA contains uracil;DNA usually does not. 
C) RNA cannot form helices. 
D) RNA is usually single-stranded;DNA is double-stranded. 
A) The sugar ring of RNA is more oxidized than that in DNA. 
B) RNA contains uracil;DNA usually does not. 
C) RNA cannot form helices. 
D) RNA is usually single-stranded;DNA is double-stranded.

The supercoiling of double-stranded circular DNA can be removed by cleaving a single phosphodiester bond on only one strand (nicking).

The abbreviation pdAp indicates

Stem-loop is a type of secondary structure not usually found in

It is possible to synthesize DNA containing specific polynucleotide bases today.

DNA wraps around an octamer of histones to form bead-like structures called ________.

About 150 bp of DNA wrap around the histone octamer to form a bead-like structure.The "beads" are separated by about 50 bp of linker DNA.

Which is not true of the different conformations of DNA?

About how many nucleosomes could be made from a DNA strand consisting of 1000 base pairs?

Regions of DNA that are most easily unwound have

The recognition site of some restriction enzymes are shown.Which will produce sticky ends?

A HATS enzymes reacts with the side-chain of lysine to form the following structure: What effect will the HATS enzymes have on histones?

Which of the following is mismatched?

Five different bases are found in most DNA and RNA molecules.

Which is not a difference between RNA and DNA?

Introduction to Biochemistry

Water

Amino Acids and the Primary Structures of Proteins

Proteins: Three-Dimensional Structure and Function

Properties of Enzymes

Mechanisms of Enzymes

Coenzymes and Vitamins

Carbohydrates

Lipids and Membranes

Introduction to Metabolism

Glycolysis

Gluconeogenesis, the Pentose Phosphate Pathway, and Glycogen Metabolism

The Citric Acid Cycle

Electron Transport and Atp Synthesis

Photosynthesis

Lipid Metabolism

Amino Acid Metabolism

Nucleotide Metabolism

DNA Replication, repair, and Recombination

Transcription and RNA Processing

Protein Synthesis

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Exam 19: Nucleic Acids

The supercoiling of double-stranded circular DNA can be removed by cleaving a single phosphodiester bond on only one strand (nicking).

The abbreviation pdAp indicates

Stem-loop is a type of secondary structure not usually found in

It is possible to synthesize DNA containing specific polynucleotide bases today.

DNA wraps around an octamer of histones to form bead-like structures called ________.

About 150 bp of DNA wrap around the histone octamer to form a bead-like structure.The "beads" are separated by about 50 bp of linker DNA.

Which is not true of the different conformations of DNA?

About how many nucleosomes could be made from a DNA strand consisting of 1000 base pairs?

Regions of DNA that are most easily unwound have

The recognition site of some restriction enzymes are shown.Which will produce sticky ends?

A HATS enzymes reacts with the side-chain of lysine to form the following structure: What effect will the HATS enzymes have on histones?

Which of the following is mismatched?

Five different bases are found in most DNA and RNA molecules.

Which is not a difference between RNA and DNA?

Introduction to Biochemistry

Water

Amino Acids and the Primary Structures of Proteins

Proteins: Three-Dimensional Structure and Function

Properties of Enzymes

Mechanisms of Enzymes

Coenzymes and Vitamins

Carbohydrates

Lipids and Membranes

Introduction to Metabolism

Glycolysis

Gluconeogenesis, the Pentose Phosphate Pathway, and Glycogen Metabolism

The Citric Acid Cycle

Electron Transport and Atp Synthesis

Photosynthesis

Lipid Metabolism

Amino Acid Metabolism

Nucleotide Metabolism

DNA Replication, repair, and Recombination

Transcription and RNA Processing

Protein Synthesis

Filters