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

Many important substances in biological systems are ionic. What property of water allows these substances to dissolve and make water a good solvent?

Cohesion between molecules

A High latent heat of vaporisation

Polar Molecules

2 / 20

What word best describes this molecule?

Ionic

Polar

Neutral

3 / 20

What type of reaction is involved in the breakdown of ATP?

Condensation

Hydrolysis

4 / 20

True or False : The enzyme DNA polymerase can only move in one direction along the template strand.

TRUE

FALSE

5 / 20

Which enzyme works along the template DNA strand, joining new monomers together?

DNA Ligase

DNA Polymerase

DNA Helicase

6 / 20

In a section of double stranded DNA, there were 62 bases. Of these, 20 were A. How many of the bases were G?

22

21

11

7 / 20

What type of bond forms between complementary base pairs?

Phosphodiester

Ionic

Hydrogen

8 / 20

What is the difference in the pentose sugar in DNA, compared to RNA?

RNA has two oxygens missing

RNA has an oxygen missing

DNA has an oxygen missing

9 / 20

Explain why line B forms a plateau:

Because the enzyme has denatured.

Because the enzyme is catalysing as fast as it can, and cannot make any more enzyme-substrate complexes.

Because eventually all the substrate is used up, and no new product can be formed, no matter how much enzyme is added.

10 / 20

The optimum temperature for this enzyme is actually 40^oC. Describe what the line would look like on the above graph.

It would rise at the same rate as 25oC, but the extend beyond, and plateau above it.

It would rise steeper than 25oC at the start , but then plateau above it.

It would rise steeper than 25oC at the start , but then plateau at the same mass.

11 / 20

On the above graph, lines A and B represent the same enzyme, in identical conditions; the only difference is the temperature.

What would happen to the red line after this point ?

It would eventually plateau below the black line

It would eventually plateau on the black line.

It would not plateau, but continue straight.

12 / 20

On the above diagram, which letter represents the activation energy with an enzyme?

A

B

C

13 / 20

Which of the following is the best description of the 'Quaternary Structure' of a protein?

A polypeptide and an extra group such as a prosthetic group (like haem in hemoglobin).

More than one polypeptide held together by bonds.

The folding of a polypeptie into a complicated globular structure.

14 / 20

What is the name of the NH₂ group on an amino acid molecule?

Amine

Ammonium

Azide

15 / 20

Which biochemical test is used to identify lipids?

Benedict's Test

The Emulsion Test

Iodine Test

16 / 20

What is the general formula for a saturated fatty acid?

C_nH_2nO_n

C_nH_nO₂

C_nH_2nO₂

17 / 20

Which polysaccharide do animal cells use as storage?

Starch

Fat

Glycogen

18 / 20

This polysaccharide of glucose is branched. What is the advantage to the organism of branching ?

It fits around organelles easily.

More sites for enzymes it to bind to.

Can form structural support iside cells.

19 / 20

Which two types of polysaccharide form starch?

Amylose and Cellulose

Amylose and Amylopectin

Amylopectin and Cellulose

20 / 20

Which reagent is used to test for reducing sugars?

Biurets

Benecol

Benedicts

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