BIOLOGY

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Question 23 of 48

3.75 Points

Noncompetitive inhibition occurs when

A.a substance binds at the activity site

B.a substance binds on a site away from the active site

C.denaturing an enzyme

D.increasing the activity of an enzyme Reset Selection

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Question 24 of 48

3.75 Points

Organisms must use macromolecules that have properties to match their functional requirements. In the list below, choose the appropriate macromolecule whose properties meet the requirement.

A. glycogen

B. RNA

C. DNA

D. cellulose

E. starch

1. Requirement:

Strong cell walls

Properties:

Linear polymer rigid and strong

2. Requirement

Stable storage of information

Properties:

4 base pairs, not easily hydrolyzed

3. Requirement:

Energy storage for seeds

Properties:

Energy-rich polysaccharides

4. Requirement:

Short-term energy storage (animals)

Properties:

Energy-rich polysaccharide

5. Requirement:

Transient transmission of information

Properties:

4 base pairs, easily hydrolyzed

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Question 25 of 48

3.75 Points

Membrane proteins are able to cross because sections are composed of

A.nonpolar phosphate regions

B.hydrophilic amino acids.

C.hydrophobic amino acids

D.polar amino acids

E.hydrophilic phosphate regions Reset Selection

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Question 26 of 48

3.75 Points

The shape of the cell is predominantly maintained by the

A.plasma membrane

B.cytoskeleton

C.cytoplasm

D.endomembrane system Reset Selection

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Question 27 of 48

3.75 Points

What is the function of cholesterol in plasma membranes?

A.allows ions to pass

B.regulates pH

C.promotesartherosclerosis

D.regulates fluidity Reset Selection

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Question 28 of 48

3.75 Points

When donating blood, hemoglobin levels are measured by using a narrow glass tube to obtain blood from a finger prick. The blood is pulled up the tube by _____________________.

A.cohesiveness

B.covalent bonds

C.hydrophobic interactions

D.hydrogen bonds

E.ionic bonds Reset Selection

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Question 29 of 48

3.75 Points

What protein is matched with its function?

A.aquaporins – move water through the membrane by active transport

B.carrier protein – nonspecific and will allow material to pass directly through

C.channel protein – allow passage of material through the hydrophilic pore

D.transport proteins – allow passage of material with the aid of ATP

Reset Selection

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Question 30 of 48

3.75 Points

C6H12O6 + 6O2 à 6H2O + 6CO2 is an example of ________________.

A.catabolism

B.anabolism

C.synthesis Reset Selection

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Question 31 of 48

3.75 Points

Carbon-12, Carbon-13, and Carbon-14 are examples of

A.isomers

B.molecules

C.ions

D.isotopes

E.enantiomers Reset Selection

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Question 32 of 48

3.75 Points

What statement(s) describes a concentration gradient?

A. Oxygen in blood plasma is .31 per 100 ml. Oxygen carried with hemoglobin is .69 per 100 ml.

B. Extracellular fluid contains 13.5 mmol of calcium, and 9 mmol of calcium is in the plasma.

C. The temperature inside the car is 39 degrees Celsius and the temperature outside the care is 39 degree Celsius.

D. Red blood cells cytoplasm contains a 0.9% salt solution. The extracellular fluid is 1.0%.

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Question 33 of 48

3.75 Points

How can ice float?

A.the covalent bonds expand, decreasing density

B.the hydrogen bonds expand, decreasing density

C.the covalent bonds collapse, increasing density

D.the hydrogen bonds collapse, increasing density Reset Selection

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Question 34 of 48

3.75 Points

Which of the following form the foundation of plasma membranes?

A.Glycoproteins

B.Fatty acids

C.Glycolipids

D.Phospholipids

E.Proteins Reset Selection

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Question 35 of 48

3.75 Points

You and your roommate are grocery shopping. “I don’t get it,” she says. “My doctor said I should buy this special milk because I don’t digest it well. But this brand says ‘lactose-free’ and this brand says ‘lactase added’ – which do I want?”

You reply: “The

_______________ is a sugar in milk that you have trouble digesting, and

_________________ is an enzyme that will digest it for you.

A.lactase, lactose

B.lactose,lactase Reset Selection

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Question 36 of 48

3.75 Points

If sodium does not move down its gradient in the co-transport pump, what would be the outcome?

A.Sugar would not be affected

B.Sugar would not be able to move down the gradient

C.Sugar would not be able to move up the gradient Reset Selection

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