Question 1

Which of thfollowing describes thnaturof ricin?

Accepted Answer

A) polypeptide 
B) amino acid 
C) polysaccharide 
D) monosaccharide 
E) lipid 
A) polypeptide 
B) amino acid 
C) polysaccharide 
D) monosaccharide 
E) lipid

Question 2

Therarhow many different kinds of RNA codons?

Accepted Answer

A) 3 
B) 12 
C) 28 
D) 64 
E) 120 
A) 3 
B) 12 
C) 28 
D) 64 
E) 120

Question 3

Initiation of translation starts when __________ binds to an mRNA.

Accepted Answer

A) a large ribosomal subunit 
B) a ribosome 
C) a small ribosomal subunit 
D) RNA polymerase 
E) DNA polymerase 
A) a large ribosomal subunit 
B) a ribosome 
C) a small ribosomal subunit 
D) RNA polymerase 
E) DNA polymerase

Question 4

Thconcept that a set of threnucleotides specifies a particular amino aciprovides thbasis for

Accepted Answer

A) the one gene, one enzyme hypothesis. 
B) the one gene, one polypeptide hypothesis. 
C) the genetic code. 
D) biochemical reactions among nucleic acids. 
E) all of these. 
A) the one gene, one enzyme hypothesis. 
B) the one gene, one polypeptide hypothesis. 
C) the genetic code. 
D) biochemical reactions among nucleic acids. 
E) all of these.

Question 5

Which of thfollowing statements is INCORRECT?

Accepted Answer

A) In chain elongation, amino acids are added to the chain according to the sequence in the messenger RNA. 
B) The messenger RNA molecule is stationary, and a series of ribosomes called polysomes travel along the molecule, manufacturing a series of polypeptides at the same time. 
C) The shape of transfer RNA molecules is uniform and is maintained by hydrogen bonds. 
D) Enzymes found in the ribosomes catalyze the formation of the bonds in the new polypeptide. 
E) Polypeptide assembly is reversible. 
A) In chain elongation, amino acids are added to the chain according to the sequence in the messenger RNA. 
B) The messenger RNA molecule is stationary, and a series of ribosomes called polysomes travel along the molecule, manufacturing a series of polypeptides at the same time. 
C) The shape of transfer RNA molecules is uniform and is maintained by hydrogen bonds. 
D) Enzymes found in the ribosomes catalyze the formation of the bonds in the new polypeptide. 
E) Polypeptide assembly is reversible.

Question 6

Thsynthesis of an RNA moleculfroa DNA templatstranis

Accepted Answer

A) replication. 
B) translation. 
C) transcription. 
D) DNA synthesis. 
E) metabolism. 
A) replication. 
B) translation. 
C) transcription. 
D) DNA synthesis. 
E) metabolism.

Question 7

In mammals, X chromosominactivation results in

Accepted Answer

A) a total shut down of both female X chromosomes. 
B) only the shut down of the X chromosome derived from the father. 
C) only the shut down of the X chromosome derived from the mother. 
D) the shut down of either the X from the father or the X from the mother. 
E) death of the female. 
A) a total shut down of both female X chromosomes. 
B) only the shut down of the X chromosome derived from the father. 
C) only the shut down of the X chromosome derived from the mother. 
D) the shut down of either the X from the father or the X from the mother. 
E) death of the female.

Question 8

In which of thfollowing regions woula castor-oil plant grow successfully?

Accepted Answer

A) Connecticut 
B) Hawaii 
C) Alaska 
D) New York 
E) Norway 
A) Connecticut 
B) Hawaii 
C) Alaska 
D) New York 
E) Norway

Question 9

If thcodon consisteof only 2 nucleotides therwoulbhow many possiblcodons?

Accepted Answer

A) 4 
B) 8 
C) 16 
D) 32 
E) 64 
A) 4 
B) 8 
C) 16 
D) 32 
E) 64

Question 10

If an mRNA carries CUCGAU as a sequence, what woulbthsequencof thcoding stranof DNA?

Accepted Answer

A) CTCGAT 
B) GUGCUA 
C) GTGCAT 
D) GAGCTA 
E) none of these 
A) CTCGAT 
B) GUGCUA 
C) GTGCAT 
D) GAGCTA 
E) none of these

Question 11

Which of thfollowing adds RNA nucleotides, onat a time, during transcription?

Accepted Answer

A) RNA polymerase 
B) DNA polymerase 
C) endonuclease 
D) transfer RNA 
E) all of these 
A) RNA polymerase 
B) DNA polymerase 
C) endonuclease 
D) transfer RNA 
E) all of these

Question 12

Which of thfollowing arinactivateby ricin?

Accepted Answer

A) proteins 
B) ribosomes 
C) DNA 
D) RNA 
E) sugars 
A) proteins 
B) ribosomes 
C) DNA 
D) RNA 
E) sugars

Question 13

Thdifferencbetween normal ansickle-cell hemoglobin is baseupon

Accepted Answer

A) the number of amino acids in the molecule. 
B) the substitution of one amino acid for another. 
C) the number and orientation of the amino acid chain attached to the heme portion of the molecule. 
D) the number of oxygen molecules that can be carried. 
E) the types of bone marrow that produce it. 
A) the number of amino acids in the molecule. 
B) the substitution of one amino acid for another. 
C) the number and orientation of the amino acid chain attached to the heme portion of the molecule. 
D) the number of oxygen molecules that can be carried. 
E) the types of bone marrow that produce it.

Question 14

Transcription

Accepted Answer

A) occurs on the surface of the ribosome. 
B) is the final process in the assembly of protein. 
C) occurs during the synthesis of any type of RNA from a DNA template. 
D) is catalyzed by DNA polymerase. 
E) is true of all of these. 
A) occurs on the surface of the ribosome. 
B) is the final process in the assembly of protein. 
C) occurs during the synthesis of any type of RNA from a DNA template. 
D) is catalyzed by DNA polymerase. 
E) is true of all of these.

Question 15

Four of thfivanswers listebelow arsteps in translation.Select thEXCEPTION.

Accepted Answer

A) initiation 
B) replication 
C) chain elongation 
D) termination 
E) peptide bond formation 
A) initiation 
B) replication 
C) chain elongation 
D) termination 
E) peptide bond formation

Question 16

Ricin is internationally considereas a weapon.Its usis now bannein most countries according to th__________.

Accepted Answer

A) Libreville protocol. 
B) Paris protocol. 
C) Kyoto protocol. 
D) Geneva protocol. 
E) Camp David protocol. 
A) Libreville protocol. 
B) Paris protocol. 
C) Kyoto protocol. 
D) Geneva protocol. 
E) Camp David protocol.

Question 17

In multicellular organisms, specialization in structuranfunction of cells is causeby

Accepted Answer

A) mutations in the cell's DNA. 
B) the temperature of the body. 
C) a differential expression of genes. 
D) the metabolism of carbohydrate. 
E) all of these. 
A) mutations in the cell's DNA. 
B) the temperature of the body. 
C) a differential expression of genes. 
D) the metabolism of carbohydrate. 
E) all of these.

Question 18

Four of thfivanswers listebelow arrelateto pairings.Select thEXCEPTION.

Accepted Answer

A) double-stranded DNA - messenger RNA 
B) adenine - thymine 
C) codon - anticodon 
D) small subunit - large subunit 
E) promoter - terminator 
A) double-stranded DNA - messenger RNA 
B) adenine - thymine 
C) codon - anticodon 
D) small subunit - large subunit 
E) promoter - terminator

Question 19

Thgenetic codis madup of units consisting of how many nucleotides?

Accepted Answer

A) 2 
B) 3 
C) 5 
D) 6 
E) 16 
A) 2 
B) 3 
C) 5 
D) 6 
E) 16

Question 20

Which of thfollowing carries amino acids to ribosomes?

Accepted Answer

A) mRNA 
B) tRNA 
C) hnRNA 
D) rRNA 
E) all of these 
A) mRNA 
B) tRNA 
C) hnRNA 
D) rRNA 
E) all of these

Exam 7: Gene Expression and Control

Which of thfollowing describes thnaturof ricin?

Therarhow many different kinds of RNA codons?

Initiation of translation starts when __________ binds to an mRNA.

Thconcept that a set of threnucleotides specifies a particular amino aciprovides thbasis for

Which of thfollowing statements is INCORRECT?

Thsynthesis of an RNA moleculfroa DNA templatstranis

In mammals, X chromosominactivation results in

In which of thfollowing regions woula castor-oil plant grow successfully?

If thcodon consisteof only 2 nucleotides therwoulbhow many possiblcodons?

If an mRNA carries CUCGAU as a sequence, what woulbthsequencof thcoding stranof DNA?

Which of thfollowing adds RNA nucleotides, onat a time, during transcription?

Which of thfollowing arinactivateby ricin?

Thdifferencbetween normal ansickle-cell hemoglobin is baseupon

Transcription

Four of thfivanswers listebelow arsteps in translation.Select thEXCEPTION.

Ricin is internationally considereas a weapon.Its usis now bannein most countries according to th__________.

In multicellular organisms, specialization in structuranfunction of cells is causeby

Four of thfivanswers listebelow arrelateto pairings.Select thEXCEPTION.

Thgenetic codis madup of units consisting of how many nucleotides?

Which of thfollowing carries amino acids to ribosomes?

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 Evolutionunit

Population Ecology

Communities and Ecosystems

The Biosphere and Human Eff Ects

Animal Tissues and Organs

How Animals Move

Circulation and Respiration

Immunity

Digestion and Excretion

Neural Control and the Senses

Endocrine Control

Reproduction and Development

Plant Form and Function

Plant Reproduction and Development

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