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

What happens to the number of different alleles during a genetic bottleneck?

They are increased, because of an increase in mutations.

They are reduced, because those wiped out alleles give a disadvantage to the organism.

They are reduced due to massive population reduction, but which alleles are removed is due to chance.

2 / 20

Which of the following is the result of a chromosome mutation?

Cystic Fibrosis

Down's Syndrome

Huntington's

3 / 20

What type of mutation is this ? ACCTGG becomes ACTGG

Addition

Substitution

Deletion

4 / 20

What is a gene mutation?

The addition of a marker molecule onto the DNA

A chemical which binds to DNA

A change in the DNA base sequence

5 / 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.

6 / 20

Which of the following would decrease the rate of transpiration?

High Humidity

High Light Intensity

High Temperature

7 / 20

Xylem or Phloem ? - No end plates on these cells

Xylem

Phloem

8 / 20

Would the number of carrier proteins present affect the rate of active transport across a membrane?

Yes

No

9 / 20

True or false : Active transport can go down a concentration gradient, or up a concentration gradient.

TRUE

FALSE

10 / 20

In the above experiment, two flasks contained identical masses of animal tissue, identical volume of a solution containing sodium ions, but an inhibitor of ATP production in flask F. Scientists concluded that flask G took up sodium ions by active transport. What is the evidence of this?

a) Uptake in flask G much greater than in flask F , showing use of ATP in flask G

b) Sodium ion concentration in flask G falls to zero, showing uptake against a concentration gradient

a

b

a & b

11 / 20

True or False: In order to function, carrier proteins have to change shape.

TRUE

FALSE

12 / 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

13 / 20

Assume the image of the scale bar in this picture is 2cm long. What is the magnification of this image?

x 200,000

x2,000

x20,000

14 / 20

Which of the following molecules contain a phosphate group?

Amino Acids, Nucleotides and ATP

Amino Acids and ATP

Nucleotides and ATP

15 / 20

What substance are enzymes made out of?

Amino Acids

Fatty Acids

Polysaccharides

16 / 20

The sample needs to be treated before adding the regent. How does it need to be treated?

Add a few drops of NaOH to make it alkaline.

Heated in a boiling water bath for 5 minutes.

Add a few drops of HCl to make it acidic.

17 / 20

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

COH₂

COH

COOH

18 / 20

What is the main structural difference between Amylose and Amylopectin?

Amylopectin is coiled, and amylose is branched.

Amylopectin and amylose are branched.

Amylopectin is branched, and amylose is coiled.

19 / 20

How do you convert sucrose (which will test negative for a reducing sugar) , into monosaccharides which will test positive as a reducing sugar?

Add sodium hydrogen carbonate to sucrose solution and heat.

Boil the sucrose solution first, then test for a reducing sugar.

Heat sucrose solution with HCl, then neutralise with sodium hydrogencarbonate. Then test for a reducing sugar.

20 / 20

Molecule D is NOT alpha glucose. What is wrong with it ?

The OH group is in the wrong place on carbon 1

The OH group is in the wrong place on carbon 2

The OH group is in the wrong place on carbon 4

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