June 2018 QP Paper 1

Question 1

What is a main tissue that removes glucose from the blood in response to insulin?

Answer 1

Skeletal muscles and the liver.

Question 2

Why is ATP needed for muscle contraction?

Answer 2

ATP breaks the cross-bridges between myosin and actin.

Question 3

What happens to light wavelength in water?

Answer 3

It will decrease.

Question 4

What is a function of the membrane within cells?

Answer 4

Provide a site for chemical reactions. Provide an attachment site for enzymes.

Question 5

What is a property of cholesterol in the bilayer?

Answer 5

To regulate fluidity.

Question 6

What is the process of using a potometer?

Answer 6

1. • Cut the sample under the water. Then submerge the tubing and glass pipette tubes in the water making sure that there are no air bubbles. Attach the cutting to the end of the tube and then attach to glass pipette.
2. Use petroleum jelly to seal the attachment points and insure that everything stays underwater.
3. Attach equipment to a clamp stand.
4. Then time and measure the distance the air bubble moves to indicate transpiration rate.

Question 7

What are properties of cellulose?

Answer 7

-Insoluble
-Flexible
-High tensile strength

Question 8

What is the difference between extra and intracellular?

Answer 8

Intracellular consists of fluid from inside the cell compared to use of fluid from outside the cell for extracellular.

Question 9

What is the structural difference between alpha and beta glucose?

Answer 9

Beta glucose has the OH group on the bottom for carbon 1 and 4 whereas it alternates for alpha glucose.

Question 10

What are the reactants for ATP?

Answer 10

ADP + Pi

Question 11

In chemiosmosis, how is an H+ gradient achieved?

Answer 11

H+ ions pumped over membrane to produce a concentration gradient.