Question 1

How many codons specify the amino acid leucine?

Accepted Answer

A) 2 
B) 3 
C) 4 
D) 5 
E) 6 
A) 2 
B) 3 
C) 4 
D) 5 
E) 6 E

Question 2

Match each term with the most appropriate description.
-binds to ribosomes to begin translation

Accepted Answer

A) Anticodon 
B) rRNA 
C) Codon 
D) Ribosome 
E) genetic code
F)translation termination
G)messenger RNA
H)Promoters
I)Transcription
J)Translation 
A) Anticodon 
B) rRNA 
C) Codon 
D) Ribosome 
E) genetic code
F)translation termination
G)messenger RNA
H)Promoters
I)Transcription
J)Translation G

Question 3

Which type of mutation results in sickle cell anemia?

Accepted Answer

A) base-pair substitution 
B) insertion 
C) deletion 
D) frame-shift 
E) gene duplication 
A) base-pair substitution 
B) insertion 
C) deletion 
D) frame-shift 
E) gene duplication A

Question 4

Many ribosome-inactivating proteins are not toxic to humans because _____.

Accepted Answer

A) we have enzymes to detoxify them 
B) they are very rare in nature 
C) they are sequestered by white blood cells 
D) they are rapidly metabolized 
E) they do not cross cell membranes very well 
A) we have enzymes to detoxify them 
B) they are very rare in nature 
C) they are sequestered by white blood cells 
D) they are rapidly metabolized 
E) they do not cross cell membranes very well

Question 5

In sickle cell anemia,what happens to the hemoglobin molecule that causes the red blood cell to sickle?

Accepted Answer

A) a small part of it becomes hydrophobic 
B) a small part of it becomes hydrophilic 
C) a small part of it becomes polar 
D) a small part of it becomes negatively charged 
E) a small part of it becomes positively charged 
A) a small part of it becomes hydrophobic 
B) a small part of it becomes hydrophilic 
C) a small part of it becomes polar 
D) a small part of it becomes negatively charged 
E) a small part of it becomes positively charged

Question 6

Which types of cells are most likely to have high levels of methyl groups in their DNA?

Accepted Answer

A) embryonic cells 
B) blastocyst cells 
C) senescent cells (cells that are not actively dividing) 
D) apoptotic cells (cells that are undergoing cell death) 
E) rapidly dividing cells 
A) embryonic cells 
B) blastocyst cells 
C) senescent cells (cells that are not actively dividing) 
D) apoptotic cells (cells that are undergoing cell death) 
E) rapidly dividing cells

Question 7

Ricin is a toxin found in _____.

Accepted Answer

A) canola-oil seeds 
B) castor-oil seeds 
C) gypsum-weed seeds 
D) sesame seeds 
E) sunflower seeds 
A) canola-oil seeds 
B) castor-oil seeds 
C) gypsum-weed seeds 
D) sesame seeds 
E) sunflower seeds

Question 8

What are the non-coding segments of DNA called?

Accepted Answer

A) introns 
B) exons 
C) promoters 
D) transcription factors 
E) knockouts 
A) introns 
B) exons 
C) promoters 
D) transcription factors 
E) knockouts

Question 9

Mutations at intron-exon splice sites in DNA can lead to a(n)_____.

Accepted Answer

A) short or truncated protein 
B) protein that has a change in polarity 
C) change in hydrophobicity 
D) unspliced mRNA 
E) mRNA that cannot be translated 
A) short or truncated protein 
B) protein that has a change in polarity 
C) change in hydrophobicity 
D) unspliced mRNA 
E) mRNA that cannot be translated

Question 10

Match each term with the most appropriate description.
-occurs when stop codons are read

Accepted Answer

A) anticodon 
B) rRNA 
C) codon 
D) ribosome 
E) genetic code
F)translation termination
G)messenger RNA
H)promoters
I)transcription
J)translation 
A) anticodon 
B) rRNA 
C) codon 
D) ribosome 
E) genetic code
F)translation termination
G)messenger RNA
H)promoters
I)transcription
J)translation

Question 11

Match each term with the most appropriate description.
-RNA-directed synthesis of polypeptide chains

Accepted Answer

A) anticodon 
B) rRNA 
C) codon 
D) ribosome 
E) genetic code
F)translation termination
G)messenger RNA
H)promoters
I)transcription
J)translation 
A) anticodon 
B) rRNA 
C) codon 
D) ribosome 
E) genetic code
F)translation termination
G)messenger RNA
H)promoters
I)transcription
J)translation

Question 12

The information from messenger RNA is used to create polypeptide sequences during the process of _____.

Accepted Answer

A) transduction 
B) transcription 
C) transformation 
D) translation 
E) replication 
A) transduction 
B) transcription 
C) transformation 
D) translation 
E) replication

Question 13

DNA molecules contain protein coding sequences called _____.

Accepted Answer

A) genotypes 
B) genomes 
C) nucleotides 
D) genes 
E) ribonucleic acids 
A) genotypes 
B) genomes 
C) nucleotides 
D) genes 
E) ribonucleic acids

Question 14

Transcription factors bind to _____.

Accepted Answer

A) promoters 
B) stop codons 
C) start codons 
D) poly-A tails 
E) introns 
A) promoters 
B) stop codons 
C) start codons 
D) poly-A tails 
E) introns

Question 15

Methylation of histone proteins promotes _____.

Accepted Answer

A) transcription 
B) translation 
C) binding of transcription factors 
D) condensation of DNA 
E) differentiation 
A) transcription 
B) translation 
C) binding of transcription factors 
D) condensation of DNA 
E) differentiation

Question 16

Internationally,the use of ricin as a weapon is banned in most countries according to the ____.

Accepted Answer

A) Madrid protocol 
B) Paris protocol 
C) Kyoto protocol 
D) Geneva protocol 
E) Vienna protocol 
A) Madrid protocol 
B) Paris protocol 
C) Kyoto protocol 
D) Geneva protocol 
E) Vienna protocol

Question 17

Why are mutations uncommon in normal cells?

Accepted Answer

A) Only 25% of the genome codes for proteins, therefore the probability is low that a mutation would occur in a protein coding region. 
B) Most mutations occur after DNA replication. 
C) Many amino acids are coded for by more than one codon. 
D) The mutation rate during DNA replication is 1 in 100 nucleotides. 
E) The mutation rate during DNA replication is zero. 
A) Only 25% of the genome codes for proteins, therefore the probability is low that a mutation would occur in a protein coding region. 
B) Most mutations occur after DNA replication. 
C) Many amino acids are coded for by more than one codon. 
D) The mutation rate during DNA replication is 1 in 100 nucleotides. 
E) The mutation rate during DNA replication is zero.

Question 18

The master gene that controls eye development in all multicellular eukaryotes is an example of a(n)_____.

Accepted Answer

A) homeotic gene 
B) conserved protein 
C) RNA enzyme 
D) Barr body 
E) translation factor 
A) homeotic gene 
B) conserved protein 
C) RNA enzyme 
D) Barr body 
E) translation factor

Question 19

Identify the type of mutation associated with the following questions and statements.Some answers may be used more than once.
-The mutation in the keratin gene in sphynx cats causes a change in the intron-exon splice site,and is an example of which type of mutation?

Accepted Answer

A) Deletion only 
B) Insertion only 
C) Base-pair substitution 
D) Frame-shift mutation 
A) Deletion only 
B) Insertion only 
C) Base-pair substitution 
D) Frame-shift mutation

Question 20

Epigenetic modifications _____.

Accepted Answer

A) are considered evolutionary 
B) are completely reset during development 
C) alter the DNA sequence 
D) can persist for generations 
E) respond less rapidly to environmental changes than altering the DNA sequence 
A) are considered evolutionary 
B) are completely reset during development 
C) alter the DNA sequence 
D) can persist for generations 
E) respond less rapidly to environmental changes than altering the DNA sequence

How many codons specify the amino acid leucine?

Match each term with the most appropriate description. -binds to ribosomes to begin translation

Which type of mutation results in sickle cell anemia?

Many ribosome-inactivating proteins are not toxic to humans because _____.

In sickle cell anemia,what happens to the hemoglobin molecule that causes the red blood cell to sickle?

Which types of cells are most likely to have high levels of methyl groups in their DNA?

Ricin is a toxin found in _____.

What are the non-coding segments of DNA called?

Mutations at intron-exon splice sites in DNA can lead to a(n)_____.

Match each term with the most appropriate description. -occurs when stop codons are read

Match each term with the most appropriate description. -RNA-directed synthesis of polypeptide chains

The information from messenger RNA is used to create polypeptide sequences during the process of _____.

DNA molecules contain protein coding sequences called _____.

Transcription factors bind to _____.

Methylation of histone proteins promotes _____.

Internationally,the use of ricin as a weapon is banned in most countries according to the ____.

Why are mutations uncommon in normal cells?

The master gene that controls eye development in all multicellular eukaryotes is an example of a(n)_____.

Identify the type of mutation associated with the following questions and statements.Some answers may be used more than once. -The mutation in the keratin gene in sphynx cats causes a change in the intron-exon splice site,and is an example of which type of mutation?

Epigenetic modifications _____.

Invitation To Biology

Molecules Of Life

Cell Structure

Energy And Metabolism

Capturing And Releasing Energy

DNA Structure And Function

How Cells Reproduce

Patterns Of Inheritance

Biotechnology

Evidence Of Evolution

Processes Of Evolution

Early Life Forms And The Viruses

Plants And Fungi

Animal Evolution

Population Ecology

Communities And Ecosystems

The Biosphere And Human Effects

Filters

Exam 7: Gene Expression AND Control

How many codons specify the amino acid leucine?

Match each term with the most appropriate description. -binds to ribosomes to begin translation

Which type of mutation results in sickle cell anemia?

Many ribosome-inactivating proteins are not toxic to humans because _____.

In sickle cell anemia,what happens to the hemoglobin molecule that causes the red blood cell to sickle?

Which types of cells are most likely to have high levels of methyl groups in their DNA?

Ricin is a toxin found in _____.

What are the non-coding segments of DNA called?

Mutations at intron-exon splice sites in DNA can lead to a(n)_____.

Match each term with the most appropriate description. -occurs when stop codons are read

Match each term with the most appropriate description. -RNA-directed synthesis of polypeptide chains

The information from messenger RNA is used to create polypeptide sequences during the process of _____.

DNA molecules contain protein coding sequences called _____.

Transcription factors bind to _____.

Methylation of histone proteins promotes _____.

Internationally,the use of ricin as a weapon is banned in most countries according to the ____.

Why are mutations uncommon in normal cells?

The master gene that controls eye development in all multicellular eukaryotes is an example of a(n)_____.

Identify the type of mutation associated with the following questions and statements.Some answers may be used more than once. -The mutation in the keratin gene in sphynx cats causes a change in the intron-exon splice site,and is an example of which type of mutation?

Epigenetic modifications _____.

Invitation To Biology

Molecules Of Life

Cell Structure

Energy And Metabolism

Capturing And Releasing Energy

DNA Structure And Function

How Cells Reproduce

Patterns Of Inheritance

Biotechnology

Evidence Of Evolution

Processes Of Evolution

Early Life Forms And The Viruses

Plants And Fungi

Animal Evolution

Population Ecology

Communities And Ecosystems

The Biosphere And Human Effects

Filters