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:

  

<i>DD</i>

 

<i>Dd</i>

 

<i>dd</i>

 

<i>DI</i>

 

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:

  

2<i>n</i> + 1

 

<i>n</i> + 1

 

2<i>n</i> - 1

 

<i>n</i> - 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

 

<p> Chlorophyll   <i>a</i></p>

 

Carotenoids

 

<p> Chlorophyll   <i>b</i></p>

 

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.