BIOLOGY

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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Question 37 of 48

3.75 Points

When phospholipids are placed in water, why does a bilayer form?

A.Phospholipids are naturally attracted to each other, forcing phosphate heads to face the aqueous areas.

B.The fatty acid tails are forced together away from the water, and water can create hydrogen bonds with the phosphate heads.

C.Lipids are hydrophilic and will from hydrogen bonds with the water, forcing the hydrophobic heads towards the middle of the bilayer.

D.The polar tails will be attracted to the water and the nonpolar heads will be attracted to each other.   Reset Selection

 

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