Question 1

Which RNA molecules carry genetic information away from DNA when it is needed for the construction of a protein?

Accepted Answer

A) Ribosomal RNA 
B) Transfer RNA 
C) Messenger RNA 
D) Primary mRNA transcript 
A) Ribosomal RNA 
B) Transfer RNA 
C) Messenger RNA 
D) Primary mRNA transcript C

Question 2

What is the function of DNA ligase?

Accepted Answer

A) To carry DNA into a new cell. 
B) To join the end of the new strand to the old one. 
C) To make millions of copies of a specific segment of DNA. 
D) To destroy damaged DNA.DNA ligase joins the ends of DNA strand fragments produced in DNA replication and mutation repair.It is also used for this function in recombinant DNA technologies. 
A) To carry DNA into a new cell. 
B) To join the end of the new strand to the old one. 
C) To make millions of copies of a specific segment of DNA. 
D) To destroy damaged DNA.DNA ligase joins the ends of DNA strand fragments produced in DNA replication and mutation repair.It is also used for this function in recombinant DNA technologies. B

Question 3

Down syndrome is an example of

Accepted Answer

A) aneuploidy. 
B) changes in the liner arrangement of genes within one chromosome. 
C) monosomy. 
D) polyploidy. 
A) aneuploidy. 
B) changes in the liner arrangement of genes within one chromosome. 
C) monosomy. 
D) polyploidy. A

Question 4

Males are said to be ___________ for traits carried on the X chromosome.

Accepted Answer

The answer of Males are said to be ___________ for...

Question 5

mRNA molecules attach themselves to a _______ for the production of proteins.

Accepted Answer

The answer of mRNA molecules attach themselves to a _______...

Question 6

At its simplest,meiosis could be described as

Accepted Answer

A) duplication-division. 
B) duplication-duplication-division. 
C) duplication-division-division. 
D) division. 
A) duplication-division. 
B) duplication-duplication-division. 
C) duplication-division-division. 
D) division.

Question 7

Which of the following are sex chromosomes of a normal human male?

Accepted Answer

A) XY 
B) XX 
C) XO 
D) YO 
A) XY 
B) XX 
C) XO 
D) YO

Question 8

Methylation of cytosine residues is involved in

Accepted Answer

A) feedback control. 
B) translational control. 
C) gene rearrangement. 
D) DNA modification and control. 
A) feedback control. 
B) translational control. 
C) gene rearrangement. 
D) DNA modification and control.

Question 9

A codon is composed of _______ bases.

Accepted Answer

A) two 
B) three 
C) four 
D) six 
A) two 
B) three 
C) four 
D) six

Question 10

Sister chromatids of each pair of homologous chromosomes _____,or come into 'side-by-side contact' to form a tetrad.

Accepted Answer

A) crossing-over 
B) locus 
C) dyad 
D) synapse 
A) crossing-over 
B) locus 
C) dyad 
D) synapse

Question 11

The first control in gene activity is _______ control.

Accepted Answer

A) translational 
B) transcriptional 
C) gene rearrangement 
D) DNA modification 
A) translational 
B) transcriptional 
C) gene rearrangement 
D) DNA modification

Question 12

Alleles are genes that

Accepted Answer

A) are linked. 
B) are lethal when homozygous. 
C) occupy corresponding places in homologous chromosomes. 
D) are never heterozygous. 
A) are linked. 
B) are lethal when homozygous. 
C) occupy corresponding places in homologous chromosomes. 
D) are never heterozygous.

Question 13

You are a science journalist writing a piece on the history of our study of DNA.Your editor would like you to summarize your current work so she can evaluate it and determine the readiness of your work for publication.Compare the following statements and determine which best conveys the facts related to your study of DNA.

Accepted Answer

A) Statement 1 - 'The study of DNA has been ongoing since the time of Charles Darwin and Gregor Mendel.Those scientists used knowledge of DNA to determine the mechanisms of evolution and the principles of heredity,respectively.' 
B) Statement 2 - 'The study of DNA has been ongoing since the time of Charles Darwin and Gregor Mendel.Their work on evolution and the principles of evolution led Beadle and Tatum to propose a link between DNA and metabolism.' 
C) Statement 3 - 'The study of DNA has been ongoing since the time of Beadle and Tatum who,based on other work being completed in the decades surrounding their work,proposed a link between DNA and metabolism.' 
D) Statement 4 - 'The study of DNA has been ongoing since the time of Beadle and Tatum who,based on other work being completed in the decades surrounding their work,proposed a link between DNA and the principles of heredity.' 
A) Statement 1 - 'The study of DNA has been ongoing since the time of Charles Darwin and Gregor Mendel.Those scientists used knowledge of DNA to determine the mechanisms of evolution and the principles of heredity,respectively.' 
B) Statement 2 - 'The study of DNA has been ongoing since the time of Charles Darwin and Gregor Mendel.Their work on evolution and the principles of evolution led Beadle and Tatum to propose a link between DNA and metabolism.' 
C) Statement 3 - 'The study of DNA has been ongoing since the time of Beadle and Tatum who,based on other work being completed in the decades surrounding their work,proposed a link between DNA and metabolism.' 
D) Statement 4 - 'The study of DNA has been ongoing since the time of Beadle and Tatum who,based on other work being completed in the decades surrounding their work,proposed a link between DNA and the principles of heredity.'

Question 14

Which of the following is NOT correct about X-linked characteristics?

Accepted Answer

A) More males than females are affected. 
B) If a female exhibits the trait,all of her sons will also inherit and exhibit it. 
C) Females can be carriers of the gene without showing it. 
D) Males have two copies of the alleles for the trait,but females have only one. 
A) More males than females are affected. 
B) If a female exhibits the trait,all of her sons will also inherit and exhibit it. 
C) Females can be carriers of the gene without showing it. 
D) Males have two copies of the alleles for the trait,but females have only one.

Question 15

The phenomenon where an allele at one locus may mask or prevent the expression of an allele at another locus acting on the same trait is called ____________.

Accepted Answer

The answer of The phenomenon where an allele at one...

Question 16

Which type of RNA molecule forms the large and small subunits of the cytoplasmic structure that builds proteins?

Accepted Answer

A) Ribosomal RNA 
B) Transfer RNA 
C) Messenger RNA 
D) Primary mRNA transcript 
A) Ribosomal RNA 
B) Transfer RNA 
C) Messenger RNA 
D) Primary mRNA transcript

Question 17

In the case of tall and dwarf pea plants,if a pea plant shows a recessive phenotype,

Accepted Answer

A) it can be either TT or Tt. 
B) it can be either Tt or tt. 
C) it can be only TT. 
D) it can be only tt. 
A) it can be either TT or Tt. 
B) it can be either Tt or tt. 
C) it can be only TT. 
D) it can be only tt.

Question 18

Transfer RNA functions in

Accepted Answer

A) delivering amino acids to the mRNA-ribosome complex. 
B) synthesizing mRNA. 
C) delivering amino acids to DNA. 
D) None of the choices is correct. 
A) delivering amino acids to the mRNA-ribosome complex. 
B) synthesizing mRNA. 
C) delivering amino acids to DNA. 
D) None of the choices is correct.

Question 19

On the cloverleaf-shaped tRNA,what is exposed to form base pairs with complementary codon bases in the mRNA?

Accepted Answer

A) A polysome 
B) An intron 
C) An anticodon 
D) RNA polymerase 
A) A polysome 
B) An intron 
C) An anticodon 
D) RNA polymerase

Question 20

Which is a correct usage of phenotype and genotype?

Accepted Answer

A) Phenotype is the cause of genotype 
B) Phenotype is restricted to characteristics involving size and color 
C) One genotype may produce many phenotypes 
D) Two different genotypes may produce the same phenotype 
A) Phenotype is the cause of genotype 
B) Phenotype is restricted to characteristics involving size and color 
C) One genotype may produce many phenotypes 
D) Two different genotypes may produce the same phenotype

Exam 5: Genetics: a Review

Which RNA molecules carry genetic information away from DNA when it is needed for the construction of a protein?

What is the function of DNA ligase?

Down syndrome is an example of

Males are said to be ___________ for traits carried on the X chromosome.

mRNA molecules attach themselves to a _______ for the production of proteins.

At its simplest,meiosis could be described as

Which of the following are sex chromosomes of a normal human male?

Methylation of cytosine residues is involved in

A codon is composed of _______ bases.

Sister chromatids of each pair of homologous chromosomes _____,or come into 'side-by-side contact' to form a tetrad.

The first control in gene activity is _______ control.

Alleles are genes that

Which of the following is NOT correct about X-linked characteristics?

The phenomenon where an allele at one locus may mask or prevent the expression of an allele at another locus acting on the same trait is called ____________.

Which type of RNA molecule forms the large and small subunits of the cytoplasmic structure that builds proteins?

In the case of tall and dwarf pea plants,if a pea plant shows a recessive phenotype,

Transfer RNA functions in

On the cloverleaf-shaped tRNA,what is exposed to form base pairs with complementary codon bases in the mRNA?

Which is a correct usage of phenotype and genotype?

Life: Biological Principles and the Science of Zoology

The Origin and Chemistry of Life

Cells As Units of Life

Cellular Metabolism

Organic Evolution

The Reproductive Process

Principles of Development

Architectual Pattern of an Animal

Taxonomy and Phylogeny of Animals

Unicellular Eukaryotes

Sponges and Placozoans

Cnidarians and Ctenophores

Acoelomorpha, Platyzoa, and Mesozoa

Polyzoa and Kryptrochozoa

Molluscs

Annelids and Allied Taxa

Smaller Ecdysozoans

Trilobites, Chelicerates, and Myriapods

Crustaceans

Hexapods

Chaetognaths, echinoderms, and Hemichordates

Chordates

Fishes

Early Tetrapods and Modern Amphibians

Amniote Origins and Nonavian Reptiles

Birds

Mammals

Support, Protection, and Movement

Homeostasis: Osmotic Regulation, Excretion, and Temperature Regulation

Homeostasis: Internal Fluids and Respiration

Digestion and Nutrition

Nervous Coordination: Nervous System and Sense Organs

Chemical Coordination: Endocrine System

Immunity

Animal Behavior

Animal Distribution

Animal Ecology

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