Walden PUBH6170 week 2 quiz

27 Jun Walden PUBH6170 week 2 quiz

Question
Question 1
Which of the following is true regarding active transport?
Answer

Active transport requires energy

Molecules are moved across a plasma membrane from an area of higher concentration to an area of lower concentration.

Active transport relies on the process of diffusion.

Molecules to be transported attach to phospholipids in the plasma membrane; as the phospholipids change shape, the molecules are moved across the membrane.

This mechanism allows a cell to equalize the concentration of molecules on either side of the plasma membrane.
1 points

Question 2
A codon is:
Answer

a type of DNA repair enzyme.

a promoter that prevents the attachment of RNA polymerase.

a sequence of three nitrogenous bases on mRNA that corresponds to an amino acid.

the part of the ribosome to which mRNA attaches.

a sequence of three nitrogenous bases on tRNA that corresponds to an amino acid.
1 points

Question 3
Despite the positive effects of liposuction, research indicates that regular exercise and dieting are the best ways to lose body weight.
Answer
True

False

1 points

Question 4
Which of the following is not true regarding liposuction?
Answer

Complications include drug reactions, ultrasound burns, and blood clots.

Liposuction has proven to be just as beneficial to the health of an individual as losing the equivalent amount of weight through exercise and diet.

Liposuction is a fast way to lose weight and shape the body.

Liposuction is used to permanently remove localized bodies of fat.

A current development in liposuction involves the use of ultrasound which is used to break open the walls of the fat cells.
1 points

Question 5
During DNA replication, complementary nucleotides are added to the separated strands of the original DNA by enzymes. Which of the following bases would a nucleotide contain if it were paired to a nucleotide containing thymine?
Answer

adenine

uracil

another thymine

cytosine

guanine
1 points

Question 6
Although a specific codon specifies only one amino acid, several different codons can specify the same amino acid.
Answer
True

False

1 points

Question 7
Immediately after a meal, which of the following is first used by cells as an energy source?
Answer

fat

glycogen

lactic acid

amino acids

glucose
1 points

Question 8
Which of the following is not true regarding receptor proteins?
Answer

They are used to receive and transmit information across the plasma membrane.

All cells have the same receptor proteins.

When a receptor protein binds to a molecule, a series of biochemical reactions occur that eventually cause changes to occur in the cell.

The molecule that binds to a receptor protein does not enter the cell.

Receptor proteins bind to a specific molecule or group of molecules.
1 points

Question 9
During cell division, it is essential that the genetic material be distributed equally to the resulting cells. This is accomplished through the participation of which of the following organelles?
Answer

centrioles

ribosomes

peroxisomes

Golgi apparatus

nucleolus
1 points

Question 10
Which of the following is true regarding glial cells?
Answer

located in the matrix of cartilage

transmit nerve impulses from the brain to the internal organs

stimulate the contraction of cardiac muscle

support and protect neurons

produce blood plasma
1 points

Question 11
Muscle cells require more energy in order to function than most other cells. Therefore, muscle cells would be expected to have more ________ than most other cells.
Answer

mitochondria

cell membranes

lysosomes

centrioles

Golgi apparatus
1 points

Question 12
Vasoconstriction is a term that refers to the contraction of muscle in the walls of the blood vessels, thus causing the diameter of the blood vessel to decrease. Which of the following types of muscle would be involved in this contraction?
Answer

skeletal

smooth

cardiac

both cardiac and smooth

both skeletal and smooth
1 points

Question 13
The processes of initiation, elongation, and termination that occur in the production of a protein are all associated with:
Answer

DNA replication.

processing of a fat in the endoplasmic reticulum.

correction of a mutation.

formation of an intact ribosome.

translation.
1 points

Question 14
Which of the following is not a function of the skin?
Answer

production of vitamin D

storage of calcium

protection from dehydration

defense from microorganisms

regulation of body temperature
1 points

Question 15
Mutations in our DNA rarely impair normal cell function because
Answer

repair of DNA prevents all mutations from ever causing damage to a cell.

damaged cells will commit “suicide” to prevent damage to the body.

cells have one major repair enzyme that corrects the mutations quickly.

multiple DNA repair enzymes usually quickly correct the mutations before any damage can occur.

the cells attack disfunctional gene products, averting damage to a cell.