Gene Function

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Question 1

Free

Short Answer

Please select the best match for each term.
A)Hexosaminidase A
B)Galactose-1-phosphate uridyl transferase
C)Homogentisic acid oxidase
D)Hypoxanthine guanine phosphoribosyltransferase
E)Fructose-1,6-diphosphatase
-1)Alkaptonuria
2)Tay-Sachs disease
3)Lesch-Nyhan syndrome
4)Galactosemia
5)Hypoglycemia

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Question 2

Free

Multiple Choice

Why did Garrod define alkaptonuria as a recessive genetic disease?

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It is expressed in male members of an affected family.

It is expressed in all members of an affected family.

It is expressed under certain environmental conditions.

It is expressed when two alleles for the disease are present.

It is expressed when one of the two alleles carries the disease trait.

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Question 3

Free

Multiple Choice

What was the significance of Beadle and Tatum's experiment?

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It resulted in the central dogma.

It led to the discovery of bread mold.

It resulted in the one-gene-one-enzyme hypothesis.

It led to the discovery of the genetic code.

It proved that X-rays were mutagens.

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Question 4

Free

Multiple Choice

What does a gene actually code for?

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A polypeptide

An enzyme

An amino acid

A protein

A nucleotide

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Question 5

Free

Multiple Choice

Which genetic disease(s)are caused by defective proteins that are not enzymes?

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Tay-Sachs disease and phenylketonuria

Sickle-cell anemia and cystic fibrosis

Lesch-Nyhan syndrome.

Albinism and alkaptonuria

All of these

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Question 6

Multiple Choice

Amniocentesis involves

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prenatal diagnosis of genetic defects in a fetus.

tests for enzyme and protein deficiencies in a fetus.

taking a sample of amniotic fluid with a needle.

analysis for DNA and chromosome defects in a fetus.

All of these

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Question 7

Multiple Choice

Auxotrophs are organisms that can grow

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on minimal media.

on complete media.

only on amino acid supplemented media.

only on vitamin supplemented media.

on any media.

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Question 8

Multiple Choice

A lysosomal storage disease is caused by

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failure of the cell to produce lysosomes.

the inability to synthesize glycolipids.

mutations in genes for lysosomic membrane proteins.

an excess in the production of lysosomic digestive enzymes.

mutations in genes that code for lysosomic digestive enzymes.

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Question 9

Multiple Choice

Cystic fibrosis is caused by a mutation in the gene that encodes which enzyme?

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Pyruvate kinase

CFTR protein

Hexosaminidase A

Hemoglobin

Tyrosine kinase

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Question 10

Multiple Choice

In a molecule of hemoglobin C,an aspartic acid residue is changed into a ________ residue.

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lysine

tyrosine

leucine

phenylalanine

glutamine

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Question 11

Multiple Choice

A mutation that has pleiotropic consequences

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results in a single symptom in the affected person.

may result in only slight symptoms in a person with the mutation.

is only detected in homozygotes.

has widespread consequences in the affected person.

cannot be detected by enzyme assay.

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Question 12

Multiple Choice

Individuals with Lesch-Nyhan syndrome exhibit

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urine that turns black when exposed to air.

compulsive self-mutilation behaviors.

lighter than normal pigmentation of skin,hair,and eyes.

severe anemia.

a cherry-colored spot on the retina.

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Question 13

Multiple Choice

A mutagen is

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the process that generates mutants.

the agent that induces mutants.

the mutants that are generated by an agent.

the experiment that generates mutants.

the process that corrects mutants.

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Question 14

Multiple Choice

In people who do not have Tay-Sachs disease,the hexA gene encodes an enzyme that

Choose correct answer/s

converts purines to uric acid in the kidneys.

removes a sugar group from phenylalanine.

converts tyrosine to melanin in skin.

cleaves acetylgalactosamine from gangliosides.

synthesizes glycogen from glucose monomers.

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Question 15

Multiple Choice

A person with sickle-cell trait has ________ at the β-globin locus.

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two wild-type alleles

two mutant alleles

one wild-type and one mutant allele

one wild-type and one deleted allele

one mutant and one deleted allele

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Question 16

Multiple Choice

Which of the following is a sex-linked disorder?

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Lesch-Nyhan syndrome

Alkaptonuria

Albinism

Down syndrome

Tay-Sachs disease

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Question 17

Multiple Choice

Which of the following statements about phenylketonuria (PKU)is false?

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Buildup of phenylpyruvic acid affects the nervous system.

The amino acid tyrosine cannot be made.

Production of the hormone thyroxin s affected.

The skin color of those with phenylketonuria is light because of decreased levels of melanin.

Adrenalin levels increase in the blood stream.

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Question 18

Multiple Choice

The cystic fibrosis gene (CFTR)codes for a protein that is essential for

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secretion of mucus.

ion transport across membranes.

transport of oxygen in red blood cells.

metabolism of certain amino acids.

processing of gangliosides.

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Question 19

Multiple Choice

A carrier for a disease

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is homozygous for the dominant mutation.

is homozygous for the recessive mutation.

is heterozygous for the dominant mutation.

is heterozygous for the recessive mutation

is hemizygous for any mutation.

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Question 20

Multiple Choice

Normal and sickle-cell hemoglobin molecules differ

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in the number of amino acids in each molecule.

by a single DNA point mutation that leads to the substitution of one amino acid for another.

in the number and orientation of the amino acid chains attached to the heme portion of each molecule.

in the number of oxygen molecules that can be carried by each molecule.

by the type of bone marrow that produces them.

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Gene Function

Please select the best match for each term.A)Hexosaminidase AB)Galactose-1-phosphate uridyl transferaseC)Homogentisic acid oxidaseD)Hypoxanthine guanine phosphoribosyltransferaseE)Fructose-1,6-diphosphatase-1)Alkaptonuria2)Tay-Sachs disease3)Lesch-Nyhan syndrome4)Galactosemia5)Hypoglycemia

Why did Garrod define alkaptonuria as a recessive genetic disease?

What was the significance of Beadle and Tatum's experiment?

What does a gene actually code for?

Which genetic disease(s)are caused by defective proteins that are not enzymes?

Amniocentesis involves

Auxotrophs are organisms that can grow

A lysosomal storage disease is caused by

Cystic fibrosis is caused by a mutation in the gene that encodes which enzyme?

In a molecule of hemoglobin C,an aspartic acid residue is changed into a ________ residue.

A mutation that has pleiotropic consequences

Individuals with Lesch-Nyhan syndrome exhibit

A mutagen is

In people who do not have Tay-Sachs disease,the hexA gene encodes an enzyme that

A person with sickle-cell trait has ________ at the β-globin locus.

Which of the following is a sex-linked disorder?

Which of the following statements about phenylketonuria (PKU)is false?

The cystic fibrosis gene (CFTR)codes for a protein that is essential for

A carrier for a disease

Normal and sickle-cell hemoglobin molecules differ