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

In this experiment bacteria grown in N¹⁵, were then treansfered to N¹⁴, and allowed to divide for two generations ( tubeB). Describe what the cenrifuged DNA bands would look like.

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

Two bands: one at N.N¹⁴, and one at N¹⁵

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

2 / 20

The diagram shows a template strand of DNA. Which of the following is the order the first 5 new bases will be added (first in the sequence, would be first to be added)?

TAGCC

TGCCA

ATCGG

3 / 20

How many bonds form between the Bases C and G when the base pair?

1

2

3

4 / 20

Which of the following is not true of RNA?

It contains the organic bases A, T, C & G.

It is shorter than DNA.

It is much shorter than most DN strands.

5 / 20

DNA and RNA are both polymers of which monomer?

Amino Acids

Saccharides

Nucleotides

6 / 20

What has happened to the enzyme when it becomes denatured with a high temperature?

It has broken down all the substrate, so the reaction stops.

The substrate has changed shape, and is no longer complementary to the active site.

The tertiary structure of the active site has changed shape, and is no longer complementary to the substrate.

7 / 20

A scientist measured the rate of removal of amino acids from a polypeptide with and without an enzyme present. With the enzyme present, 500 amino acids were released per second. Without the enzyme, 2.0 × 10^-8 amino acids were released per second. Calculate by how many times the rate of reaction is greater with the enzyme present.

2.5 x 10^-10

4 x 10^-11

10 x 10^-10

8 / 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.

9 / 20

What substance are enzymes made out of?

Amino Acids

Fatty Acids

Polysaccharides

10 / 20

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

A

B

C

11 / 20

Enzymes are biological catalysts: they speed up reactions. This allows the reactions to happen at...

higher temperatures

lower temperatures

lower pH's

12 / 20

Other than peptide bonds, a folded protein also contains:

i) Hydrogen Bonds
ii) Ionic Bonds
iii) Di-Sulphide Bridges.

Which bonds form the secondary structure?

i)

i) and ii)

i), ii) and iii)

13 / 20

Which is the correct structure for an amino acid?

A

B

D

14 / 20

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

Amine

Ammonium

Azide

15 / 20

Which of the following is not true about triglycerides?

Insoluble in water.

Insoluble in lipids.

Soluble in lipids.

16 / 20

Which of these two molecules is a saturated fatty acid?

A

B

Neither

17 / 20

Which monomer is this polysaccharide made out of?

Alpha Glucose

Beta Glucose

Fructose

18 / 20

Which monomer is starch made out of?

Alpha Glucose

Beta Glucose

Fructose

19 / 20

What would the products be from the hydrolysis of sucrose?

Glucose and Fructose

Glucose, Fructose and Water

Glucose, Galactose and water

20 / 20

Which of the following is NOT a monosaccharide?

Lactose

Galactose

Glucose

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