BIOL 1003 REAL EXAM 2025 PRACTICE QUESTIONS
AND CORRECT ANSWERS/ BIOLOGY 1002 LSU PREP
TEST BANK WITH 500 EXAM PRACTICE QUESTIONS
AND CORRECT VERIFIED ANSWERS
An individual who is a carrier for a sex-linked trait, such as hemophilia, has what trait?
a. is always male.
b. is homozygous for the recessive condition.
c. shows the dominant phenotype.
d. cannot pass the gene on to his or her daughters.
e. NONE of the above - CORRECT ANSWER-C. shows the dominant phenotype
A color-blind boy has a mother with normal vision and a color-blind father. From which parent did he
get the color-blind gene?
a. father
b. mother
c. either mother or father
d. NONE of the above - CORRECT ANSWER-B.) mother
Codominance occurs when what happens?
a. both of the alleles in a heterozygote are expressed phenotypically in an individual.
b. expression of two different alleles alternates from one generation to the next.
c. a heterozygote expresses an intermediate phenotype.
d. offspring exhibit several different phenotypic expressions of a single trait.
e. NONE of the above - CORRECT ANSWER-A.) both of the alleles in a heterozygote are
expressed phenotypically in an individual
Which of the following conditions causes may cause infertility in a human?
a. XXX
b. XYY
c. XXY
,d. XY
e. XX - CORRECT ANSWER-C.) XXY
The failure of chromosomes to segregate properly during meiosis is called what?
a. nondisjunction.
b. translocation.
c. replication.
d. inversion.
e. independent assortment. - CORRECT ANSWER-A.) nondisjunction
Sex-linked traits affect only sexual characteristics. True or False?
a. TRUE
b. FALSE - CORRECT ANSWER-B.) false
A recessive allele on the X chromosome causes color blindness. A NON color-blind woman (whose
father is color-blind) marries a color-blind man. What is the chance that their son will be color-blind?
a. 0%
b. 25%
c. 50%
d. 75%
e. 100% - CORRECT ANSWER-C.) 50%
A sex-linked recessive condition that causes abnormal color vision is called what?
a. cystic fibrosis.
b. Down syndrome.
c. hemophilia.
d. color blindness.
e. NONE of the above - CORRECT ANSWER-D.) color blindness
Sex-linked Gene - CORRECT ANSWER-Found only on the X or only on the Y chromosome. (23rd)
,Autosome gene - CORRECT ANSWER-a chromosome that occurs in homozygous pairs in both
males and females and that does not bear the genes determining sex
The function of the promoter is to signal the RNA polymerase to do what?
a. where to start transcribing the DNA. b. which strand of the DNA to read.
c. where to start translating the DNA. d. NONE of the above answers - CORRECT ANSWER-A
The genetic material of some viruses, such as HIV, is not normal DNA but is instead what
component?
a. RNA.
b. protein.
c. carbohydrate.
d. lipid.
e. single-stranded DNA. - CORRECT ANSWER-A
The sequence of nitrogen-containing bases on one strand of DNA most directly determines the
sequence of what?
a. fatty acids in a fat molecule.
b. amino acids in a protein molecule. c. sugars in a polysaccharide molecule. d. bases in a protein
molecule.
e. NONE of the above answers - CORRECT ANSWER-B
The nitrogenous base uracil pairs with which base?
a. thymine.
b. adenine.
c. guanine.
d. cytosine.
e. uracil. - CORRECT ANSWER-B
Which of the following is found in RNA but NOT in DNA?
, a. adenine
b. uracil
c. thymine
d. phosphate groups
e. deoxyribose - CORRECT ANSWER-B
Which of the following has two polynucleotide strands?
a. ribosomal RNA
b. DNA
c. messenger RNA
d. transfer RNA
e. RNA polymerase - CORRECT ANSWER-D
"Gene expression" is a term that relates to what?
a. how genes are passed from parent to offspring.
b. the unique set of genes in an individual.
c. the karyotype of a chromosome set.
d. the flow of genetic information from DNA to proteins.
e. DNA replication. - CORRECT ANSWER-D
Which of the following has anticodons?
a. ribosomal RNA
b. DNA
c. messenger RNA
d. transfer RNA
e. RNA polymerase - CORRECT ANSWER-D
Incomplete Dominance - CORRECT ANSWER-when a heterozygous phenotype is intermediate
between 2 homozygous phenotypes (curly hair)
AND CORRECT ANSWERS/ BIOLOGY 1002 LSU PREP
TEST BANK WITH 500 EXAM PRACTICE QUESTIONS
AND CORRECT VERIFIED ANSWERS
An individual who is a carrier for a sex-linked trait, such as hemophilia, has what trait?
a. is always male.
b. is homozygous for the recessive condition.
c. shows the dominant phenotype.
d. cannot pass the gene on to his or her daughters.
e. NONE of the above - CORRECT ANSWER-C. shows the dominant phenotype
A color-blind boy has a mother with normal vision and a color-blind father. From which parent did he
get the color-blind gene?
a. father
b. mother
c. either mother or father
d. NONE of the above - CORRECT ANSWER-B.) mother
Codominance occurs when what happens?
a. both of the alleles in a heterozygote are expressed phenotypically in an individual.
b. expression of two different alleles alternates from one generation to the next.
c. a heterozygote expresses an intermediate phenotype.
d. offspring exhibit several different phenotypic expressions of a single trait.
e. NONE of the above - CORRECT ANSWER-A.) both of the alleles in a heterozygote are
expressed phenotypically in an individual
Which of the following conditions causes may cause infertility in a human?
a. XXX
b. XYY
c. XXY
,d. XY
e. XX - CORRECT ANSWER-C.) XXY
The failure of chromosomes to segregate properly during meiosis is called what?
a. nondisjunction.
b. translocation.
c. replication.
d. inversion.
e. independent assortment. - CORRECT ANSWER-A.) nondisjunction
Sex-linked traits affect only sexual characteristics. True or False?
a. TRUE
b. FALSE - CORRECT ANSWER-B.) false
A recessive allele on the X chromosome causes color blindness. A NON color-blind woman (whose
father is color-blind) marries a color-blind man. What is the chance that their son will be color-blind?
a. 0%
b. 25%
c. 50%
d. 75%
e. 100% - CORRECT ANSWER-C.) 50%
A sex-linked recessive condition that causes abnormal color vision is called what?
a. cystic fibrosis.
b. Down syndrome.
c. hemophilia.
d. color blindness.
e. NONE of the above - CORRECT ANSWER-D.) color blindness
Sex-linked Gene - CORRECT ANSWER-Found only on the X or only on the Y chromosome. (23rd)
,Autosome gene - CORRECT ANSWER-a chromosome that occurs in homozygous pairs in both
males and females and that does not bear the genes determining sex
The function of the promoter is to signal the RNA polymerase to do what?
a. where to start transcribing the DNA. b. which strand of the DNA to read.
c. where to start translating the DNA. d. NONE of the above answers - CORRECT ANSWER-A
The genetic material of some viruses, such as HIV, is not normal DNA but is instead what
component?
a. RNA.
b. protein.
c. carbohydrate.
d. lipid.
e. single-stranded DNA. - CORRECT ANSWER-A
The sequence of nitrogen-containing bases on one strand of DNA most directly determines the
sequence of what?
a. fatty acids in a fat molecule.
b. amino acids in a protein molecule. c. sugars in a polysaccharide molecule. d. bases in a protein
molecule.
e. NONE of the above answers - CORRECT ANSWER-B
The nitrogenous base uracil pairs with which base?
a. thymine.
b. adenine.
c. guanine.
d. cytosine.
e. uracil. - CORRECT ANSWER-B
Which of the following is found in RNA but NOT in DNA?
, a. adenine
b. uracil
c. thymine
d. phosphate groups
e. deoxyribose - CORRECT ANSWER-B
Which of the following has two polynucleotide strands?
a. ribosomal RNA
b. DNA
c. messenger RNA
d. transfer RNA
e. RNA polymerase - CORRECT ANSWER-D
"Gene expression" is a term that relates to what?
a. how genes are passed from parent to offspring.
b. the unique set of genes in an individual.
c. the karyotype of a chromosome set.
d. the flow of genetic information from DNA to proteins.
e. DNA replication. - CORRECT ANSWER-D
Which of the following has anticodons?
a. ribosomal RNA
b. DNA
c. messenger RNA
d. transfer RNA
e. RNA polymerase - CORRECT ANSWER-D
Incomplete Dominance - CORRECT ANSWER-when a heterozygous phenotype is intermediate
between 2 homozygous phenotypes (curly hair)
