Name________________________
Concepts in Biology
Exam #3 (8-11)
Fall 2011
Mark each correct or true statement with a T and each incorrect or false statement with an F. (50)
_______1.
Without exception, all of the genes of a eukaryotic organism are located on
chromosomes within the nucleus.
_______2.
Cells that reproduce by simply dividing in half, and the daughter cells are genetic
replicas of the parent are undergoing asexual reproduction.
_______3.
The combination of DNA with histones is called the nucleosome.
_______4.
Cells that do not divide remain in the S phase of the cell cycle.
_______5.
For both autosomes and sex chromosomes we inherit one chromosome from each pair
from our mother and one from each pair from our father.
_______6.
During gamete formation each pair of alleles assorts independently of the other pairs of
alleles.
_______7.
Wild type traits are the traits most often seen in nature and but are not necessarily the
dominant trait.
_______8.
A self-fertilizing plant that produces offspring all identical to the parent are said to be
true breeding.
_______9.
After a monohybrid cross, you get 3 yellow flowered plants and 1 white flowered plant;
the 3:1 ratio is called the phenotypic ratio.
_______10.
For two alleles to cross-over, they must be linked and on sister chromatids of the
duplicated chromosomes.
_______11.
DNA shows complementary base pairing with adenine binding with uracil and cytosine
binding with guanine.
_______12.
When a cell replicates, the resulting daughter cells receive complete sets of genetic
instructions.
_______13.
To see if the expressed dominant trait is heterozygous, you would perform a test cross.
_______14.
The genetic code is said to be universal; it is the same for all eukaryotic organisms and
the same for prokaryotic organisms.
_______15.
DNA polymerase enzyme initiates the replication of the leading strand of the DNA
molecule.
_______16.
The genetic code has three start and one stop codon.
_______17.
The genetic code is degenerate in that a given amino acid can have more than one
codon.
_______18.
The genetic code is unambiguous in that a given codon codes for only one amino acid.
_______19.
In the inducible operon, the repressor is inactive.
_______20.
An example of X-chromosome inactivation occurs with the calico cat (orange and black
fur).
_______21.
Incomplete dominance occurs only in plants, never in animals.
_______22.
The so-called sex chromosomes contain genes for characters unrelated to maleness or
femaleness.
_______23.
Animal viruses can possess an envelope that is made of membrane material from its
host cell.
_______24.
A mutation that does not cause a noticeable phenotypic change is called a non-sense
mutation.
_______25.
The anticodon triplet is complementary to the mRNA codon triplet.
Select the one best answer that either defines or completes the meaning of the given statement. (50)
_______1.
The phase of mitosis in which the centromeres split and chromosomes move toward the
opposite poles of the cell
A.
B.
C.
D.
_______2.
Metaphase
Anaphase
Prophase
Telophase
The phase of mitosis in which the spindle is formed and the nuclear membrane breaks
down
A.
B.
C.
D.
Metaphase
Anaphase
Prophase
Telophase
_______3.
Crossing over occurs only during
A.
B.
C.
D.
_______4.
Abnormalities of sex chromosome numbers in humans include
A.
B.
C.
D.
_______5.
Codominance
Sex linkage
Incomplete dominance
Polygenic inheritance
Brown color is dominant over white. If you cross a heterozgous dominant brown mouse
with a homozygous white mouse, what percentage of the offspring will be white?
A.
B.
C.
D.
_______8.
Between prophase and anaphase of mitosis
Between the G1 and G2 phases of the cell cycle
Between prophase I and prophase II of meiosis
During the M phase of the cell cycle
All the offspring of a black rooster and white hen are gray. This is most likely
A.
B.
C.
D.
_______7.
Turner’s syndrome
Klinefelter’s syndrome
XXX female
All of the above are correct
A biochemist measures the amount of DNA in cells growing in the laboratory. The
quantity of DNA in a cell would be found to double
A.
B.
C.
D.
_______6.
Metaphase I
Metaphase II
Prophase I
Anaphase I
0
25
50
75
If you cross a heterozygous brown mouse with another heterozygous brown mouse,
what percentage of the offspring will be brown?
A.
B.
C.
D.
25
50
75
100
_______9.
Black color is dominant over white and curly hair is dominant over straight hair. If you
cross a heterozygous black curly haired mouse with another heterozygous black curly,
what is the phenotypic ratio?
A.
B.
C.
D.
_______10.
If you cross a red-flowered (RR) plant with a white-flowered (rr) plant, you get a pinikflowered plant. If you cross two F1 plants, what is the genotypic ratio?
A.
B.
C.
D.
_______11.
Polygenic
Codominant
Incomplete dominance
None of the above are correct
A man who has type A blood marries a woman with type B blood. Their children could
have which of the following phenotypes . Both parents are heterozygous.
A.
B.
C.
D.
_______14.
Pleiotrophy
Incomplete dominance
Polygenic inheritance
Codominance
If the phenotypes from a given trait show a bell-shaped curve, the trait is said to be
A.
B.
C.
D.
_______13.
1 homozygous red: 2 heterozygous pink: 1 homozygous white
3 red: 1 white
2 homozygous red: 1 heterozygous pink: 1 homozygous white
2 red: 2 white
ABO blood typing system is an example of
A.
B.
C.
D.
_______12.
3:1
1:1
9:3:3:1
1:1:1:1
A, B, or O
AB only
AB or O
A, B, AB, O
Purple is dominant over yellow and smooth is dominant over wrinkled. If you make the
following cross, what is the chance that the offspring will be purple yellow? PpSs X ppss
A.
B.
C.
D.
25
50
75
100
_______15.
Using the same criteria as in #14, make the cross—PpSs X PPSS. What is the chance the
offspring will be purple yellow?
A.
B.
C.
D.
_______16.
In the process of meiosis, the centromere splits during
A.
B.
C.
D.
_______17.
2
3
4
5
The DNA sequence—ACCGTAAT would produce the following mRNA
A.
B.
C.
D.
_______20.
Anaphase I
Telophase I
Anaphase II
Telophase II
The genetic code is based on codons of ___ nucleotides.
A.
B.
C.
D.
_______19.
Metaphase I
Anaphase I
Anaphase II
Telophase II
In meiosis at the end of what stage are the cells haploid?
A.
B.
C.
D.
_______18.
25
50
75
100
TGGCATTU
UUAGCGUUA
TTACGCTTA
None of the above are correct
The mutation that would most likely cause a defective gene
A.
B.
C.
D.
silent
base analog
base substitution
deletion
_______21.
The pieces of RNA that are removed during processing of the RNA transcript
A.
B.
C.
D.
_______22.
The two scientists who proposed the operon theory
A.
B.
C.
D.
_______23.
The DNA level
transcription
translation
all of the above are correct
Genes that regulate other groups of genes are called
A.
B.
C.
D.
_______25.
Griffith and Halley
Franklin and Wilkins
Beadle and Chase
Jacob and Monod
Gene regulation in eukaryotic cells can occur at
A.
B.
C.
D.
_______24.
Nucleosomes
Histones
Introns
Exons
dominators
homeotic
pleiotrophic
alternative
The overall process by which information flows from genes to proteins is called
A.
B.
C.
D.
cellular differentiation
gene expression
gene operation
the operon theory
Choose two of the following essay questions. You may do the third question as a bonus. (20)



Compare and contrast the lytic and lysogenic cycles of bacterial viruses.
Make a cross between the following: TTRR X ttrr. Show the gamete types and the F1. Cross
two F1s and show the gamete type, offspring, phenotypic ratio, and the Punnett square.
Discuss the operon theory.