Biology Year 12 Random Retrieval

This quiz contains all the questions in the year 12 biology section. The website will pick 20 questions at random.

1 / 20

After a genetic bottleneck, what is true about the alleles of the survivors?

There is the same number of different of alleles.

There are fewer alleles in the surviving population.

There are more alleles in the surviving population

2 / 20

If a small tube is inserted into the phloem through the bark of a tree, sap containing sucrose leaks out. Where on the tree will the most sap leak from due to the highest hydrostatic pressure?

Top of the branch, nearest the leaves.

Middle of the tree, near the top of the trunk.

Bottom of the trunk.

3 / 20

Why are the Atrioventricular valves open at D?

Because the heart is in diastole.

Because the pressure is higher in the ventricle than the atrium.

Because the pressure has become higher in the atria than the ventricle.

4 / 20

What is the stroke volume of a patient if their cardiac output is 3500 cm³ min^-1, and their heart rate is 70 bpm?

50 dm³

50 cm³

500 cm³

5 / 20

The Great White Shark and Black-tipped Reef Shark are two species which must keep swimming to stay alive. Why is this?

To be able to hunt for prey 24 hours a day.

To stop them sinking.

To maintain a flow of oxygenated water over their gills.

6 / 20

Which two letters would be held open by C shaped cartilage rings?

B & C

C & D

D & E

E & F

7 / 20

On the diagram above, which structure is a phagosome?

B

C

D

8 / 20

Which term describes a solution with a lower water potential than the cells bathed in it?

Hypertonic

Hypotonic

Isotonic

9 / 20

Why can't glucose diffuse directly through the phospholipids?

Because it is too large

Because it is polar

Because it is large and polar

10 / 20

Name the function of organelle A

Transport of substances out of the cell

Transport of substances into the cell

Formation of new Gogi sacs

11 / 20

What type of bond forms between water molecules?

Hydrogen

Ionic

Hydroxide

12 / 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

13 / 20

True or False : The enzyme DNA polymerase can only bind to double stranded DNA?

TRUE

FALSE

14 / 20

Which enzyme breaks the bonds between complementary base pairs in preparation for DNA replication?

DNA Ligase

DNA Polymerase

DNA Helicase

15 / 20

Why does the graph plateau?

Because the enzyme has denatured so stops catalysing.

Because all the available active sites are occupied.

Because all the available substrate has been used up.

16 / 20

Which letter on the above graph shows when the most enzyme-substrate complexes will be formed?

A

B

C

17 / 20

What is the name of the biochemical test for proteins?

Biuret

Benedicts

Sudan III

18 / 20

Which of the following shows the correct structure of a peptide bond?

A

B

C

19 / 20

How many naturally occurring amino acids are there in all living things?

20

16

64

20 / 20

What does R stand for on an amino acid?

Reduction Region

Reactionary Region

Variable Region

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