SC160 Lesson 3&4 Exam SCORE 95 PERCENT

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.