1. Body cells of human males contain (Points: 4)
one X chromosome and one Y chromosome.
two X chromosomes.
two Y chromosomes.
two O chromosomes.
chromosomes X, Y, and O.
2. Which of the following nitrogenous bases is NOT found in molecules of DNA? (Points: 4)
adenine
guanine
uracil
thymine
cytosine
3. Which of the following statements is CORRECT about mutation? (Points: 4)
A mutation is a change in the structure of DNA.
Mutations occurring during the replication process are always lethal.
Mutations occurring during the replication process are always silent.
Mutations occurring during the replication process always affect the tertiary structure of enzymes.
A mutation is a permanent change in the sequence of DNA.
4. Cloning refers to (Points: 4)
producing artificial twins.
producing many DNA copies in the laboratory.
nuclear transfer.
producing identical copies of cats and sheep.
all of these.
5. Dolly was produced using (Points: 4)
somatic cell nuclear transfer.
somatic cell nuclear fusion.
sex cell nuclear transfer.
sex cell nuclear fusion.
adult sheep cells.
6. Therapeutic cloning is being developed in order to (Points: 4)
treat some congential diseases.
treat organ failures.
produce replacement tissues.
treat some congenital diseases and organ failures.
do all of these.
7. Four of the five answers listed below are nitrogenous bases found in DNA. Select the EXCEPTION. (Points: 4)
G
A
U
T
C
8. Which of the following processes is responsible for the conversion of DNA information into RNA? (Points: 4)
replication
transcription
duplication
translation
any of these
9. Which of the following statements are true of RNA molecules? (Points: 4)
RNA are single-stranded molecules.
They contain uracil in place of guanine.
The cell contains different kinds of RNA molecules.
RNA are single-stranded molecules that are found in different kinds in the cell.
All of these are true.
10. The changing of a business letter from shorthand to typewritten copy is analogous to (Points: 4)
protein synthesis.
translation of mRNA.
transcription of DNA.
deciphering the genetic code.
replication of DNA.
11. Which of the following molecules are NOT found in ribosomes? (Points: 4)
sugars
nucleotides
amino acids
lipids
nitrogenous bases
12. Which of the following may be cause by exposure to UV light? (Points: 4)
substitution
deletion
insertion
development of covalent bonds between two adjacent thymine bases
none of these
13. In mammals, X chromosome inactivation results in (Points: 4)
a total shut down of both female X chromosomes
only the shut down of the X chromosome derived from the father
only the shut down of the X chromosome derived from the mother.
the shut down of either the X from the father or the X from the mother.
death of the female.
14. Which of the following events is (are) characteristics of the interphase? (Points: 4)
The cytoplasm divides.
The cell doubles its content.
The cell doubles its content, and the cytoplasm divides.
DNA is synthesized.
The cell doubles its content, and DNA is synthesized.
15. Alternative or different forms of the same gene are called (Points: 4)
chromosomes.
chromatids.
alleles.
homologous.
genetomorphs.
16. Meiosis typically results in the production of (Points: 4)
two diploid cells.
four diploid cells.
four haploid cells.
two haploid cells.
one triploid cell.
17. Crossing over (Points: 4)
generally results in pairing up and binary fission.
involves nuclei.
involves breakages and exchanges between sister chromatids.
alters the composition of chromosomes and results in new combinations of alleles.
is true of all of these.
18. Gamete formation is (Points: 4)
the result of the process of meiosis.
the pairing of homologous chromosomes.
the formation of sex cells.
the fusion of gametes.
a process that occurs only in asexually reproducing forms.
19. Which of the following does NOT produce variation? (Points: 4)
crossing over
random alignment of chromosomes during meiosis
asexual reproduction
genetic recombination of alleles
sexual reproduction
20. Genes that are located on the same chromosome (Points: 4)
tend to be inherited together.
will appear t
one X chromosome and one Y chromosome.
two X chromosomes.
two Y chromosomes.
two O chromosomes.
chromosomes X, Y, and O.
2. Which of the following nitrogenous bases is NOT found in molecules of DNA? (Points: 4)
adenine
guanine
uracil
thymine
cytosine
3. Which of the following statements is CORRECT about mutation? (Points: 4)
A mutation is a change in the structure of DNA.
Mutations occurring during the replication process are always lethal.
Mutations occurring during the replication process are always silent.
Mutations occurring during the replication process always affect the tertiary structure of enzymes.
A mutation is a permanent change in the sequence of DNA.
4. Cloning refers to (Points: 4)
producing artificial twins.
producing many DNA copies in the laboratory.
nuclear transfer.
producing identical copies of cats and sheep.
all of these.
5. Dolly was produced using (Points: 4)
somatic cell nuclear transfer.
somatic cell nuclear fusion.
sex cell nuclear transfer.
sex cell nuclear fusion.
adult sheep cells.
6. Therapeutic cloning is being developed in order to (Points: 4)
treat some congential diseases.
treat organ failures.
produce replacement tissues.
treat some congenital diseases and organ failures.
do all of these.
7. Four of the five answers listed below are nitrogenous bases found in DNA. Select the EXCEPTION. (Points: 4)
G
A
U
T
C
8. Which of the following processes is responsible for the conversion of DNA information into RNA? (Points: 4)
replication
transcription
duplication
translation
any of these
9. Which of the following statements are true of RNA molecules? (Points: 4)
RNA are single-stranded molecules.
They contain uracil in place of guanine.
The cell contains different kinds of RNA molecules.
RNA are single-stranded molecules that are found in different kinds in the cell.
All of these are true.
10. The changing of a business letter from shorthand to typewritten copy is analogous to (Points: 4)
protein synthesis.
translation of mRNA.
transcription of DNA.
deciphering the genetic code.
replication of DNA.
11. Which of the following molecules are NOT found in ribosomes? (Points: 4)
sugars
nucleotides
amino acids
lipids
nitrogenous bases
12. Which of the following may be cause by exposure to UV light? (Points: 4)
substitution
deletion
insertion
development of covalent bonds between two adjacent thymine bases
none of these
13. In mammals, X chromosome inactivation results in (Points: 4)
a total shut down of both female X chromosomes
only the shut down of the X chromosome derived from the father
only the shut down of the X chromosome derived from the mother.
the shut down of either the X from the father or the X from the mother.
death of the female.
14. Which of the following events is (are) characteristics of the interphase? (Points: 4)
The cytoplasm divides.
The cell doubles its content.
The cell doubles its content, and the cytoplasm divides.
DNA is synthesized.
The cell doubles its content, and DNA is synthesized.
15. Alternative or different forms of the same gene are called (Points: 4)
chromosomes.
chromatids.
alleles.
homologous.
genetomorphs.
16. Meiosis typically results in the production of (Points: 4)
two diploid cells.
four diploid cells.
four haploid cells.
two haploid cells.
one triploid cell.
17. Crossing over (Points: 4)
generally results in pairing up and binary fission.
involves nuclei.
involves breakages and exchanges between sister chromatids.
alters the composition of chromosomes and results in new combinations of alleles.
is true of all of these.
18. Gamete formation is (Points: 4)
the result of the process of meiosis.
the pairing of homologous chromosomes.
the formation of sex cells.
the fusion of gametes.
a process that occurs only in asexually reproducing forms.
19. Which of the following does NOT produce variation? (Points: 4)
crossing over
random alignment of chromosomes during meiosis
asexual reproduction
genetic recombination of alleles
sexual reproduction
20. Genes that are located on the same chromosome (Points: 4)
tend to be inherited together.
will appear t