Question 1

The _____ enzyme is responsible for unwinding the double-helix structure of DNA during replication.

Accepted Answer

A) helicase 
B) polymerase 
C) ligase 
D) extendase 
E) windase 
A) helicase 
B) polymerase 
C) ligase 
D) extendase 
E) windase

Question 2

Which is NOT associated with cancer?

Accepted Answer

A) It can establish new tumors distant from the site of the primary tumor. 
B) It forms new blood vessels and brings nutrients and oxygen to the tumor. 
C) Cancer cells can undergo cell division repeatedly and indefinitely. 
D) Tumors invade surrounding tissues and are filtered by lymph nodes. 
E) A malignant mass of cells is encapsulated and does not invade adjacent tissue. 
A) It can establish new tumors distant from the site of the primary tumor. 
B) It forms new blood vessels and brings nutrients and oxygen to the tumor. 
C) Cancer cells can undergo cell division repeatedly and indefinitely. 
D) Tumors invade surrounding tissues and are filtered by lymph nodes. 
E) A malignant mass of cells is encapsulated and does not invade adjacent tissue.

Question 3

In Figure 25.4,when replication is finished,strand 1 will have the same base composition as strand ___,while strand 2 will have the same base composition as strand ____.

Accepted Answer

A) 2; 3 
B) 1; 3 
C) 3; 4 
D) 1; 4 
E) 2; 4 
A) 2; 3 
B) 1; 3 
C) 3; 4 
D) 1; 4 
E) 2; 4

Question 4

Which of these is NOT a form of a point mutation?

Accepted Answer

A) nonsense mutation 
B) missense mutation 
C) silent mutation 
D) frameshift mutation 
E) UAC becomes UAU 
A) nonsense mutation 
B) missense mutation 
C) silent mutation 
D) frameshift mutation 
E) UAC becomes UAU

Question 5

Identify the amino acids that would be assembled based upon the following codons: CGG AUA GAC GUA.

Accepted Answer

CGG would code for arginine. A

Question 6

An intervening sequence of DNA that is not expressed is called a(n)

Accepted Answer

A) exon. 
B) intron. 
C) replicon. 
D) promoter. 
E) gene. 
A) exon. 
B) intron. 
C) replicon. 
D) promoter. 
E) gene.

Question 7

Which of the following is NOT associated with a higher cancer risk?

Accepted Answer

A) hormone therapy 
B) safe sex 
C) smoking 
D) use of alcohol 
E) exposure to certain hazardous chemicals in the workplace 
A) hormone therapy 
B) safe sex 
C) smoking 
D) use of alcohol 
E) exposure to certain hazardous chemicals in the workplace

Question 8

The genetic code consists of ____ bases that stand for one codon.

Accepted Answer

A) 1 
B) 2 
C) 3 
D) 4 
E) 20 
A) 1 
B) 2 
C) 3 
D) 4 
E) 20

Question 9

Which of the following nucleotide bases is found only in RNA,not in DNA?

Accepted Answer

A) guanine 
B) adenine 
C) thymine 
D) uracil 
E) cytosine 
A) guanine 
B) adenine 
C) thymine 
D) uracil 
E) cytosine

Question 10

Gene mutations are

Accepted Answer

A) always deleterious. 
B) always beneficial. 
C) radiation-induced changes only. 
D) alterations in the normal sequence of bases within a gene. 
E) alterations in the normal sequence of bases outside a gene. 
A) always deleterious. 
B) always beneficial. 
C) radiation-induced changes only. 
D) alterations in the normal sequence of bases within a gene. 
E) alterations in the normal sequence of bases outside a gene.

Question 11

The site of translation is the

Accepted Answer

A) nucleus. 
B) nucleolus. 
C) ribosome. 
D) ribozyme. 
E) mitochondria. 
A) nucleus. 
B) nucleolus. 
C) ribosome. 
D) ribozyme. 
E) mitochondria.

Question 12

Which of the classes of RNA molecules is linked with proteins in forming the large and small subunits of a cytoplasmic structure?

Accepted Answer

A) ribosomal RNA 
B) transfer RNA 
C) messenger RNA 
D) primary mRNA transcript 
E) ribozymes 
A) ribosomal RNA 
B) transfer RNA 
C) messenger RNA 
D) primary mRNA transcript 
E) ribozymes

Question 13

Because one original strand of the double-stranded helix is found in each daughter cell,the replication process is called

Accepted Answer

A) proofreading. 
B) semi-conservative. 
C) redundant. 
D) freeing of DNA. 
E) mutation positive. 
A) proofreading. 
B) semi-conservative. 
C) redundant. 
D) freeing of DNA. 
E) mutation positive.

Question 14

Which of the classes of RNA molecules carries the genetic information from the nucleus as it is needed for the construction of a protein?

Accepted Answer

A) ribosomal RNA 
B) transfer RNA 
C) messenger RNA 
D) primary mRNA transcript 
E) mature RNA 
A) ribosomal RNA 
B) transfer RNA 
C) messenger RNA 
D) primary mRNA transcript 
E) mature RNA

Question 15

A gene is physically located on a _____ in the nucleus of a cell.

Accepted Answer

A) chromosome 
B) messenger RNA 
C) enzymes 
D) proteins 
E) nucleus 
A) chromosome 
B) messenger RNA 
C) enzymes 
D) proteins 
E) nucleus

Question 16

If the normal nucleotide sequence was TACGGCATG,what type of gene mutation is present if the resulting sequence becomes TAGGCATG?

Accepted Answer

A) chromosomal mutation 
B) germinal mutation 
C) addition mutation 
D) deletion mutation 
E) substitution mutation 
A) chromosomal mutation 
B) germinal mutation 
C) addition mutation 
D) deletion mutation 
E) substitution mutation

Question 17

The ____ of a tRNA molecule will base-pair with the codon of a mRNA molecule.

Accepted Answer

A) DNA sequence 
B) anticodon 
C) amino acid binding site 
D) RNA polymerase 
E) promoter site 
A) DNA sequence 
B) anticodon 
C) amino acid binding site 
D) RNA polymerase 
E) promoter site

Question 18

A cell of the pancreas would specialize in producing insulin,among other functions,while a muscle cell would specialize in the production of the protein myosin.This means that

Accepted Answer

A) pancreas and muscle cells have the genes for both insulin and myosin active. 
B) the active gene in pancreas cells is the one for insulin,while the muscle cells have genes for insulin and myosin. 
C) pPancreas cells activate the gene that would produce insulin,while muscle cells activate the gene that would produce myosin. 
D) neither pancreas cells nor muscle cells are specialized. 
E) only muscle cells can produce proteins. 
A) pancreas and muscle cells have the genes for both insulin and myosin active. 
B) the active gene in pancreas cells is the one for insulin,while the muscle cells have genes for insulin and myosin. 
C) pPancreas cells activate the gene that would produce insulin,while muscle cells activate the gene that would produce myosin. 
D) neither pancreas cells nor muscle cells are specialized. 
E) only muscle cells can produce proteins.

Question 19

In semiconservative DNA replication,each new double helix formed will have

Accepted Answer

A) two new strands and two old strands. 
B) one new and one old strand in each helix. 
C) three new strands in one helix and three old strands in the second helix. 
D) two new and one old strand in one helix and two old and one new strand in second helix. 
E) two new strands in one helix and two old strands in the other helix. 
A) two new strands and two old strands. 
B) one new and one old strand in each helix. 
C) three new strands in one helix and three old strands in the second helix. 
D) two new and one old strand in one helix and two old and one new strand in second helix. 
E) two new strands in one helix and two old strands in the other helix.

Question 20

Which of the following is NOT true about RNA?

Accepted Answer

A) RNA transfers messages from DNA to ribosomes. 
B) RNA contains the sugar ribose. 
C) RNA contains adenine,guanine,uracil,and cytosine. 
D) RNA is single stranded. 
E) RNA forms a helix. 
A) RNA transfers messages from DNA to ribosomes. 
B) RNA contains the sugar ribose. 
C) RNA contains adenine,guanine,uracil,and cytosine. 
D) RNA is single stranded. 
E) RNA forms a helix.

Exam 25: Dna Structure and Control of Gene Expression

The _____ enzyme is responsible for unwinding the double-helix structure of DNA during replication.

Which is NOT associated with cancer?

In Figure 25.4,when replication is finished,strand 1 will have the same base composition as strand ___,while strand 2 will have the same base composition as strand ____.

Which of these is NOT a form of a point mutation?

Identify the amino acids that would be assembled based upon the following codons: CGG AUA GAC GUA.

An intervening sequence of DNA that is not expressed is called a(n)

Which of the following is NOT associated with a higher cancer risk?

The genetic code consists of ____ bases that stand for one codon.

Which of the following nucleotide bases is found only in RNA,not in DNA?

Gene mutations are

The site of translation is the

Which of the classes of RNA molecules is linked with proteins in forming the large and small subunits of a cytoplasmic structure?

Because one original strand of the double-stranded helix is found in each daughter cell,the replication process is called

Which of the classes of RNA molecules carries the genetic information from the nucleus as it is needed for the construction of a protein?

A gene is physically located on a _____ in the nucleus of a cell.

If the normal nucleotide sequence was TACGGCATG,what type of gene mutation is present if the resulting sequence becomes TAGGCATG?

The ____ of a tRNA molecule will base-pair with the codon of a mRNA molecule.

A cell of the pancreas would specialize in producing insulin,among other functions,while a muscle cell would specialize in the production of the protein myosin.This means that

In semiconservative DNA replication,each new double helix formed will have

Which of the following is NOT true about RNA?

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In Figure 25.4,when replication is finished,strand 1 will have the same base composition as strand _,while strand 2 will have the same base composition as strand __.