Genetics Exam 1 UPDATED Exam
Questions and CORRECT Answers
What is the difference between the theory of preformation and the theory of epigenesis?
A. Epigenesis means that living organisms can arise from nonliving organisms, whereas
preformation states that sex cells contain a complete miniature adult.
B. Preformation states that sex cells already contain a complete miniature adult, whereas the
theory of epigenesis states that an adult organism develops because of a series of events that
form de novo structures from substances present in the egg.
C.Epigenesis states that sex cells already contain a complete miniature adult, whereas the theory
of preformation states that an adult organism develops because of a series of events that form de
novo structures from substances present in the egg.
D. Preformation states that all species on earth have remained unchanged since they appeared;
epigenesis states that adult structures of an organism develop de novo from substances in the -
CORRECT ANSWER - B. Preformation states that sex cells already contain a complete
miniature adult, whereas the theory of epigenesis states that an adult organism develops because
of a series of events that form de novo structures from substances present in the egg
The functional unit of heredity is a _____.
A. Nucleotide
B. Gene
C. Nucleus
D. Chromosome - CORRECT ANSWER - B. Gene
The phenotype of an organism is ___________.
A. the set of alleles for a trait
B. the number of chromosomes characteristic of a species
C.the observed features of an organism
D. the genetic variation in a species - CORRECT ANSWER - C. The observed features of
an organism
,Mendel's work showed __________.
A. that certain genes are linked
B. that genetics and evolution are linked
C. that traits in living organisms were controlled by discrete units of inheritance (genes) that
existed in pairs and separated during gamete formation
D. that pea plants had unique patterns of inheritance - CORRECT ANSWER -C
Which of the following errors are the sources of genetic variation?
A. errors in translation
B. changes in the amino acid sequence of proteins
C. changes in the nitrogenous base sequence of DNA
D. errors in transcription - CORRECT ANSWER -C
Sickle-cell anemia results from __________.
A. a mutation that causes no production of hemoglobin
B. a single nucleotide change in the DNA, resulting in the substitution of a valine for glutamic
acid in the protein
C. deletion of a chromosome
D. an error during transcription of the hemoglobin gene - CORRECT ANSWER -B
A certain species of mammal has 14 pairs of homologous chromosomes. What is the diploid
number of this species?
A. 7
B. 14
C. 28
D. 42 - CORRECT ANSWER - C. 28
, Codons are nucleotide triplets. How many different codons can be formed?
3
16
20
64 - CORRECT ANSWER - 64 (three letters pulled from four bases 4^3)
What is the central dogma of biology?
A. DNA → protein → RNA
B. RNA → DNA → protein
C. protein → RNA → DNA
D. DNA → RNA → protein - CORRECT ANSWER -D
Why are enzymes crucial to living organisms?
A. They are responsible for translating the genetic code stored in RNA into a sequence of amino
acids.
B. They repair DNA damage.
C. They act as biological catalysts.
D. They transport molecules into and out of the cell. - CORRECT ANSWER -C
Which of the following statements is correct regarding DNA and RNA?
A. Guanine base-pairs with cytosine.
B. The nucleotides in both DNA and RNA contain ribose.
C. The nitrogenous bases in the nucleotides are adenine, guanine, uracil, and cytosine.
D. Adenine always base-pairs with thymine. - CORRECT ANSWER -A
Questions and CORRECT Answers
What is the difference between the theory of preformation and the theory of epigenesis?
A. Epigenesis means that living organisms can arise from nonliving organisms, whereas
preformation states that sex cells contain a complete miniature adult.
B. Preformation states that sex cells already contain a complete miniature adult, whereas the
theory of epigenesis states that an adult organism develops because of a series of events that
form de novo structures from substances present in the egg.
C.Epigenesis states that sex cells already contain a complete miniature adult, whereas the theory
of preformation states that an adult organism develops because of a series of events that form de
novo structures from substances present in the egg.
D. Preformation states that all species on earth have remained unchanged since they appeared;
epigenesis states that adult structures of an organism develop de novo from substances in the -
CORRECT ANSWER - B. Preformation states that sex cells already contain a complete
miniature adult, whereas the theory of epigenesis states that an adult organism develops because
of a series of events that form de novo structures from substances present in the egg
The functional unit of heredity is a _____.
A. Nucleotide
B. Gene
C. Nucleus
D. Chromosome - CORRECT ANSWER - B. Gene
The phenotype of an organism is ___________.
A. the set of alleles for a trait
B. the number of chromosomes characteristic of a species
C.the observed features of an organism
D. the genetic variation in a species - CORRECT ANSWER - C. The observed features of
an organism
,Mendel's work showed __________.
A. that certain genes are linked
B. that genetics and evolution are linked
C. that traits in living organisms were controlled by discrete units of inheritance (genes) that
existed in pairs and separated during gamete formation
D. that pea plants had unique patterns of inheritance - CORRECT ANSWER -C
Which of the following errors are the sources of genetic variation?
A. errors in translation
B. changes in the amino acid sequence of proteins
C. changes in the nitrogenous base sequence of DNA
D. errors in transcription - CORRECT ANSWER -C
Sickle-cell anemia results from __________.
A. a mutation that causes no production of hemoglobin
B. a single nucleotide change in the DNA, resulting in the substitution of a valine for glutamic
acid in the protein
C. deletion of a chromosome
D. an error during transcription of the hemoglobin gene - CORRECT ANSWER -B
A certain species of mammal has 14 pairs of homologous chromosomes. What is the diploid
number of this species?
A. 7
B. 14
C. 28
D. 42 - CORRECT ANSWER - C. 28
, Codons are nucleotide triplets. How many different codons can be formed?
3
16
20
64 - CORRECT ANSWER - 64 (three letters pulled from four bases 4^3)
What is the central dogma of biology?
A. DNA → protein → RNA
B. RNA → DNA → protein
C. protein → RNA → DNA
D. DNA → RNA → protein - CORRECT ANSWER -D
Why are enzymes crucial to living organisms?
A. They are responsible for translating the genetic code stored in RNA into a sequence of amino
acids.
B. They repair DNA damage.
C. They act as biological catalysts.
D. They transport molecules into and out of the cell. - CORRECT ANSWER -C
Which of the following statements is correct regarding DNA and RNA?
A. Guanine base-pairs with cytosine.
B. The nucleotides in both DNA and RNA contain ribose.
C. The nitrogenous bases in the nucleotides are adenine, guanine, uracil, and cytosine.
D. Adenine always base-pairs with thymine. - CORRECT ANSWER -A
