Lesson 3 & 4 Exam Part 2
Question 1 2.5 / 2.5 points
Hypophosphatemia (vitamin D-resistant rickets) is inherited as a sex-linked dominant trait. The relevant gene is found on the X chromosome. What is the expected outcome of a cross between a homozygous recessive woman and a man with hypophosphatemia?
Question options:
All of their daughters and none of their sons exhibit hypophosphatemia.
Fifty percent of their daughters and fifty percent of their sons exhibit hypophosphatemia.
All of their sons and none of their daughters exhibit hypophosphatemia.
Twenty-five percent of their offspring exhibit hypophosphatemia.
Question 2 2.5 / 2.5 points
In humans, the presence or absence of dimples is a trait controlled by a single gene. What is the genotype of an individual who is heterozygous for dimples?
Question options:
DD
Dd
dd
DI
Question 3 2.5 / 2.5 points
Which of these techniques could tell you how gene expression differs between individuals with and without cystic fibrosis?
Question options:
Therapeutic cloning
DNA microarray
Reproductive cloning
Karyotyping
Question 4 2.5 / 2.5 points
Which of these is most likely to cause the development of a six-legged frog?
Question options:
Mutation of homeotic genes
Artificial selection
Dietary supplementation
Conversion of a proto-oncogene to an oncogene
Question 5 2.5 / 2.5 points
Which of the following turns off transcription by binding to the operator?
Question options:
RNA polymerase
Repressor
Promoter
Lactose
Question 6 2.5 / 2.5 points
The region of DNA where RNA synthesis begins is the:
Question options:
start codon.
promoter.
initiator.
processor.
Question 7 2.5 / 2.5 points
The absence of a terminator in transcription will result in:
Question options:
the creation of a virus.
a strand of mRNA that lacks its cap and tail.
the production of a longer RNA molecule.
the production of a shorter RNA molecule.
Question 8 2.5 / 2.5 points
Which of the following enzymes is responsible for RNA synthesis?
Question options:
RNase
RNA helicase
RNA ligase
RNA polymerase
Question 9 0 / 2.5 points
Reproductive cloning can:
Question options:
reacquire the genes it lost during the course of development.
come from an early stage of embryonic development.
be differentiated.
be implanted in the egg of an organism that is capable of regenerating lost body parts.
Question 10 2.5 / 2.5 points
A couple has two female children. What is the probability that their next child will be male?
Question options:
25%
50%
33%
67%
Question 11 2.5 / 2.5 points
Where is translation accomplished?
Question options:
Lysosomes
Smooth endoplasmic reticulum
Ribosomes
Nucleoli
Question 12 2.5 / 2.5 points
In eukaryotic cells, repressor proteins inhibit transcription by binding to:
Question options:
silencers.
enhancers.
regulators.
operators.
Question 13 2.5 / 2.5 points
A mating between a purebred purple-flowered pea plant and a purebred white-flowered pea plant would produce a(n):
Question options:
purebred variety.
hybrid.
P generation.
F2 generation.
Question 14 2.5 / 2.5 points
Which risk factors are associated with cancer of the colon and rectum?
Question options:
Tobacco
Radio waves
UV radiation
Dietary fat
Question 15 2.5 / 2.5 points
The __________ is most commonly found in nature.
Question options:
recessive trait
wild-type trait
parental
dominant trait
Question 16 2.5 / 2.5 points
Which of the following techniques is used to collect fetal cells during pregnancy for genetic testing?
Question options:
Testcross
Dihybrid cross
Amniocentesis
Pedigree analysis
Question 17 2.5 / 2.5 points
Transcription is the:
Question options:
manufacture of a strand of RNA complementary to a strand of DNA.
manufacture of two new DNA double helices that are identical to an old DNA double helix.
modification of a strand of RNA prior to the manufacture of a protein.
manufacture of a protein based on information carried by RNA.
Question 18 2.5 / 2.5 points
More people die of __________ cancer than of any other cancer.
Question options:
lung
skin
pancreatic
breast
Question 19 2.5 / 2.5 points
What is the ultimate source of all diversity?
Question options:
Natural selection
Sexual recombination
Meiosis
Mutation
Question 20 2.5 / 2.5 points
__________ genes violate Mendel's principle of independent assortment.
Question options:
Codominant
Linked
Recessive
Pleiotropic
Lesson 3 & 4 Exam Part 1
Question 21 0 / 2.5 points
The Calvin cycle makes direct use of __________ to make __________.
Question options:
light energy and CO2; sugar
CO2, ATP, and NADPH; sugar and O2
light energy, CO2, and water; sugar and O2
CO2, ATP, and NADPH; sugar
Question 22 2.5 / 2.5 points
What is the function of stomata?
Question options:
Water absorption
Calvin cycle
Location of photosystems
Gas exchange
Question 23 2.5 / 2.5 points
Which of the following is an autotroph?
Question options:
Human
Mushroom
Pine tree
Fish
Question 24 2.5 / 2.5 points
How many chromosomes does an individual with Turner syndrome have?
Question options:
2n + 1
n + 1
2n - 1
n - 1
Question 25 2.5 / 2.5 points
What waste product do yeast produce under anaerobic conditions?
Question options:
Ethyl alcohol
Pyruvic acid
Lactic acid
Creatine
Question 26 2.5 / 2.5 points
What name is given to a discrete packet of light?
Question options:
Phaser
Wavelength
Photon
Quantum
Question 27 2.5 / 2.5 points
The ultimate source of the energy in food is:
Question options:
the sun.
producers.
ATP.
consumers.
Question 28 2.5 / 2.5 points
During metaphase:
Question options:
the nuclear envelope breaks up.
sister chromatids separate.
centromeres divide.
chromosomes line up in the middle of the cell.
Question 29 2.5 / 2.5 points
What is responsible for the yellow-orange coloration of leaves in the fall?
Question options:
RuBP
Chlorophyll a
Carotenoids
Chlorophyll b
Question 30 2.5 / 2.5 points
One difference between mitosis and meiosis is:
Question options:
mitosis produces cells genetically identical to the parent cell, but meiosis does not.
mitosis produces more daughter cells than meiosis.
mitosis produces haploid cells, but meiosis produces diploid cells.
mitosis requires only one parent cell, but meiosis requires two parent cells.
Question 31 2.5 / 2.5 points
When a molecule absorbs a photon, one of its electrons is raised to the __________ state.
Question options:
energetic
quantum
higher
excited
Question 32 2.5 / 2.5 points
What is the difference between a benign and a malignant tumor?
Question options:
Benign tumors are composed of cancer cells; malignant tumors are not.
Benign tumors are not the result of a failure of a cell cycle control system; malignant tumors are.
Benign tumors do not metastasize; malignant tumors do.
Benign tumors do not form lumps; malignant tumors do form lumps.
Question 33 2.5 / 2.5 points
The light reactions of photosynthesis take place:
Question options:
in the stroma.
on the cristae.
in the thylakoid membrane.
in the cytosol.
Question 34 2.5 / 2.5 points
If a plant appears blue to us, what wavelength of light is being reflected?
Question options:
Blue
Green
Red
Yellow
Question 35 2.5 / 2.5 points
A child is born with a rare disease in which mitochondria are missing from certain skeletal muscle cells. Physicians find that the muscle cells function. Not surprisingly, they also find that:
Question options:
the muscles contain large amounts of lactic acid following even mild physical exercise.
the muscles contain large amounts of carbon dioxide following even mild physical exercise.
the muscles require extremely high levels of oxygen to function.
the muscle cells cannot split glucose to pyruvic acid.
Question 36 2.5 / 2.5 points
A horse eating some hay is an example of:
Question options:
an autotroph eating a producer.
an autotroph eating a consumer.
a consumer eating a producer.
a consumer eating a heterotroph.
Question 37 2.5 / 2.5 points
Electron transport takes place in the:
Question options:
mitochondria.
chloroplasts.
cytoplasm.
ribosomes.
Question 38 2.5 / 2.5 points
A __________ describes a site of crossing over.
Question options:
chiasma
histone
synapse
centromere
Question 39 2.5 / 2.5 points
A(n) __________ is an example of an organism that can sometimes reproduce asexually.
Question options:
cat
human
Komodo dragon
mouse
Question 40 2.5 / 2.5 points
Chromosomes that do not determine the sex of an individual are called:
Question options:
homologous chromosomes.
nonhomologous chromosomes.
sex chromosomes.
autosomes.
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