Biology Molecules Random Retrieval

This quiz contains all the questions in the Biology Molecules section. The website will pick 20 questions at random.

1 / 20

What is the name of molecule B?

Ribulose

Ribose

Deoxyribose

2 / 20

If DNA replicated by a Dispersive method ( fragments from each strand mixed), what would the DNA bands look like after two generations in N¹⁴ medium (Tube B)?

One band at N¹⁴

One band imbetween N¹⁴, and N¹⁵

Two bands: one at N¹⁵, and one imbetween N¹⁵ and N¹⁴

3 / 20

Which pair of scientists proved the method by which DNA replicated?

Meselson and Stahl

Watson and Crick

Franklin and Wilkins

4 / 20

How many bonds form between a 'C' and a 'G' ?

1

2

3

5 / 20

Describe what the line would look like when a non-competitive inhibitor was added to the reaction.

The line would increase less steeply, but it would eventually plateau at the same rate as withut an inhibitor.

The line would be less steep at the start, and would plateau at a rate below the line without an inhibitor.

The line would go up at the same gradient at the start, but would then plateau at a lower rate.

6 / 20

In this reaction, what is the activation energy for the enzyme catalysed reaction?

300kJ mol^-1

50kJ mol^-1

250kJ mol^-1

7 / 20

Which of the following is true, in the currently accepted model of enzyme action?

The substrate is an exact fit to the active site.

The substrate changes shape slightly to fit into the active site.

The active site changes shape slightly to fit the substrate.

8 / 20

Enzymes have a very specific shape. What type of bonds hold it in that shape?

Hydrogen Bonds and Di-Sulphide Bridges

Hydrogen and Ionic Bonds

Hydrogen Bonds, Ionic Bonds, and Di-Sulphide Bridges

9 / 20

On the above diagram, which letter represents the product?

C

D

E

10 / 20

On the above diagram, what does structure '3' represent?

A fatty acid chain

A glycerol molecule

A phosphate 'head'

11 / 20

Which of the above three molecules shows a correct bond between glycerol and a fatty acid?

A

B

C

12 / 20

What is the general formula for a saturated fatty acid?

C_nH_2nO_n

C_nH_nO₂

C_nH_2nO₂

13 / 20

Which of these two molecules is a saturated fatty acid?

A

B

Neither

14 / 20

What is the formula for the group at the end of a fatty acid where it bonds to the glycerol?

COH₂

COH

COOH

15 / 20

What subunits make up a single triglyceride?

4 subunits: 1 glycerol and 3 fatty acids

3 subunits : 1 glycerol and 2 fatty acids

3 subunits : 1 glycerol, 1 fatty acid and 1 phosphate

16 / 20

What role does this polysaccharide have?

Structural support in cell walls of plants

Structural support in bones

Structural support in storage of DNA

17 / 20

Which reagent is used to test for reducing sugars?

Biurets

Benecol

Benedicts

18 / 20

Is one of the monomers beta glucose ?

Yes

No

19 / 20

Are molecules A,B and C isomers of each other?

Yes

No

20 / 20

Which molecule is NOT glucose ?

A

B

C

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