Question 1

If the nucleotide sequence of DNA is T C C G A A, then the corresponding on mRNA is

Accepted Answer

A)  A G G C T T.
B)  C T A A G G.
C)  A G G C U U.
D)  U U C G G A.
E)  A C C G T T. C

Question 2

A tRNA molecule relays amino acids in response to a specific "blueprint" coded by the DNA.

Accepted Answer

A) True 
 B)False  True

Question 3

Which statement correctly describes the arrangement of the nitrogenous bases in the double helix of DNA?

Accepted Answer

A)   Each of the 4 nitrogenous bases on one DNA strand can pair with any of the other 4 nitrogenous base on the other strand.
B)   Any purine nitrogenous base on one DNA strand can pair with any other purine on the other DNA strand.
C)   Any pyrimidine nitrogenous base on one strand of DNA can pair with any other pyrimidine base on the other strand.
D)   Any pyrimidine nitrogenous base on one strand of DNA can pair with any purine on the other DNA strand.
E)   Adenine (
A)  , a purine, on one DNA strand pairs with thymine (T) , a pyrimidine, on the other strand; Guanine (G) , another purine, pairs with cytosine (
C)  , a pyrimidine. E

Question 4

Which is a heterozygous genotype for a given trait?

Accepted Answer

A)   YY
B)   Yy
C)   WX
D)   yy
E)   none of these answers are correct

Question 5

Assume the same cross as in question 24.If the F2 generation involves thousands of individual plants that are carefully counted, and four different phenotypes in a ratio other than 9:3:3:1 are noted, which of the following would be suspected?

Accepted Answer

A)   Absence of dominance.
B)   Linkage.
C)   Leakage of color.
D)   No crossing-over had occurred.
E)   Genes were not involved in the cross.

Question 6

If a pure breeding parent producing yellow seeds, the dominant phenotype, is crossed with a pure breeding parent producing green seeds, the recessive phenotype, the F1 generation will produce

Accepted Answer

A)   100% yellow seeds.
B)   50% yellow seeds; 50% green seeds.
C)   75% yellow seeds; 25% green seeds.
D)   75% green seeds; 25% yellow seeds.
E)   not enough information given.

Question 7

If the cross BbDD x bbDd is made, which of the following would NOT be represented in the offspring?

Accepted Answer

A)   BbDD
B)   BbDd
C)   bbDD
D)   bbDd
E)   BBDd

Question 8

Mendel's law of unit characters says that the inheritance of characteristics is controlled by factors that always occur in pairs.

Accepted Answer

A) True 
 B)False

Question 9

Mendel discovered the rules of inheritance only after the discoveries of chromosomes and meiosis.

Accepted Answer

A) True 
 B)False

Question 10

The pinpointing of relative locations of genes on chromosomes CANNOT be brought about by calculating percentages of crossing-over in large populations.

Accepted Answer

A) True 
 B)False

Question 11

Alternate forms of the same trait (yellow seeds or green seeds)are called

Accepted Answer

A)   gene factors.
B)   homologous traits.
C)   alleles.
D)   centromeres.
E)   chromosome traits.

Question 12

In sweet peas, purple flower color and oblong pollen grains are dominant, with the recessives being red flower color and spherical pollen grains.When a homozygous purple, oblong plant is crossed with a homozygous red, spherical plant, the F1 generation consists entirely of purple, oblong plants.When an F1 plant is crossed with a homozygous red, spherical plant, the offspring are produced in a ratio of 7 purple, oblong to 1 purple, spherical to 1 red, oblong to 7 red, spherical.Which of the following is the only plausible explanation for such results?

Accepted Answer

A)   Hybridization has occurred.
B)   Linkage is involved.
C)   The plants received too much fertilizer.
D)   Bad sex cells are involved.
E)   The plants resent scientists messing with their genes.

Question 13

Messenger RNA is a ______- stranded molecule.

Accepted Answer

A)   single
B)   double
C)   triple
D)   multiple
E)   both [single and double] are correct

Question 14

Which of the following describes the function of DNA in a cell?

Accepted Answer

A)   Store genetic information.
B)   Copy genetic information for each turn of the cell cycle.
C)   Controls the activities of the cell through gene expression.
D)   Mutate (or change the genetic information content) 
E)   All of the above are functions of DNA in a cell.

Question 15

If all cells of a plant have identical DNA, then why are there different cell types and tissues within a plant?

Accepted Answer

A)   Different subsets of the information are used in each type of cell.
B)   Internal environmental conditions may determine which subset of the genome is expressed.
C)   Hormones and other growth regulators may control gene expression.
D)   External environmental conditions such as light or dark may alter gene expression.
E)   All of the above may influence the expression of different subsets of genetic information from the genome, resulting in differentiation and development.

Question 16

Which statement about transposons is INCORRECT?

Accepted Answer

A)   Transposon insertion into a gene causes a mutation that can be reversed by removal of the transposon.
B)   A transposon is a small fragment of DNA that can move from one location in a chromosome to another location in the same chromosome.
C)   Transposon movement often occurs when the cell is under genomic stress.
D)   In nature, insertion of a transposon can be deliberately added into a harmful gene to enhance survival.
E)   Molecular geneticists can use transposons to determine the function of a particular gene.

Question 17

The Central Dogma of Molecular Genetics is summarized in the following statement: _____________________.

Accepted Answer

A)   Proteins convert the mRNA into tRNA molecules in the cytoplasm
B)   The flow of information in a cell is from DNA transcribed to mRNA in the nucleus, to the translation of mRNA into a polypeptide in the cytoplasm
C)   DNA is the template for the construction of polypeptides in the cytoplasm
D)   mRNA is transcribed into rRNA by the tRNA on ribosomes
E)   The semiconservative replication of DNA is the source of changes in the genome

Question 18

A backcross is one in which both parents are homozygous.

Accepted Answer

A) True 
 B)False

Question 19

The Hardy-Weinberg law addresses itself to proportions of genes in a normally interbreeding population.

Accepted Answer

A) True 
 B)False

Question 20

Chromosomal mapping primarily involves

Accepted Answer

A)   drawing diagrams of chromosomes to show their relative lengths.
B)   photographing chromosomes.
C)   cutting and pasting chromosome pictures together.
D)   studying prophase II chromosomes in squashed cells.
E)   calculating crossover percentages.

Exam 13: Genetics

If the nucleotide sequence of DNA is T C C G A A, then the corresponding on mRNA is

A tRNA molecule relays amino acids in response to a specific "blueprint" coded by the DNA.

Which statement correctly describes the arrangement of the nitrogenous bases in the double helix of DNA?

Which is a heterozygous genotype for a given trait?

Assume the same cross as in question 24.If the F2 generation involves thousands of individual plants that are carefully counted, and four different phenotypes in a ratio other than 9:3:3:1 are noted, which of the following would be suspected?

If a pure breeding parent producing yellow seeds, the dominant phenotype, is crossed with a pure breeding parent producing green seeds, the recessive phenotype, the F1 generation will produce

If the cross BbDD x bbDd is made, which of the following would NOT be represented in the offspring?

Mendel's law of unit characters says that the inheritance of characteristics is controlled by factors that always occur in pairs.

Mendel discovered the rules of inheritance only after the discoveries of chromosomes and meiosis.

The pinpointing of relative locations of genes on chromosomes CANNOT be brought about by calculating percentages of crossing-over in large populations.

Alternate forms of the same trait (yellow seeds or green seeds) are called

Messenger RNA is a ______- stranded molecule.

Which of the following describes the function of DNA in a cell?

If all cells of a plant have identical DNA, then why are there different cell types and tissues within a plant?

Which statement about transposons is INCORRECT?

The Central Dogma of Molecular Genetics is summarized in the following statement: _____________________.

A backcross is one in which both parents are homozygous.

The Hardy-Weinberg law addresses itself to proportions of genes in a normally interbreeding population.

Chromosomal mapping primarily involves