Biology Random Retrieval Y12

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

Which is an example of a Genetic Bottleneck?

Bounty hunters killing Florida Panthers almost to extinction, for a reward in the early 1900's.

A domesticated dog escaping, and breeding with wild dogs.

Two separated populations interbreeding.

2 / 20

True or False : The sex chromosomes ( X and Y) are not an homologous pair?

TRUE

FALSE

3 / 20

What happens to the solutes at the sink?

They are pumped back up phloem going the other way.

They are more dense so sink down, and gather in cells on the lower surface.

Enzymes break them down or join them together as insoluble storage.

4 / 20

What term is used to describe the 'sticking' together of water molecules?

Cohesion

Tension

Mass Flow

5 / 20

Which chamber do you think the green line represents?

Aorta

Atrium

Ventricle

6 / 20

During the Bohr Effect, what happens to the affinity of haemoglobin for oxygen?

Lowers the affinity

Increases the affinity

It does not affect the affinity

7 / 20

What is the function of the lamellae?

To maintain a concentration gradient over the whole filament.

To reduce the diffusion pathway.

To increase the surface area.

8 / 20

Which of the following is a similarity between diffusion an osmosis?

Both are a movement of a substance across a concentration gradient.

Both are a movement of a substance down a concentration gradient

Both are a movement of a substance along a concentration gradient.

9 / 20

Which part of the phospholipid bilayer prevents sodium ions leaving via simple diffusion?

Hydrophilic Heads

Hydrophobic Tails

Glycocalyx

10 / 20

Name molecule I.

Ethanol

Glycerol

Cholesterol

11 / 20

Assume the scale bar in this image is 2cm long, what is the magnification of this image?

X 40,000

X 400,000

X 250,000

12 / 20

What charge will be on the hydrogen atoms in this molecule?

A full negative charge

A partial Negative charge

A partial positive charge

13 / 20

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

DNA Ligase

DNA Polymerase

DNA Helicase

14 / 20

Which of the following is not true of RNA?

It is single stranded.

It contains deoxyribose.

It contains Uracil instead of 'T'.

15 / 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.

16 / 20

What is the next reagent to be added after this initial treatment?

Copper Carbonate

Copper Sulphate

Copper Oxide

17 / 20

What is the general formula for a saturated fatty acid?

C_nH_2nO_n

C_nH_nO₂

C_nH_2nO₂

18 / 20

It is highly branched, what type of glycosidic bond form the base of the branches?

1-4 Glycosidic Bond

1-6 Glycosidic Bond

1-2 Glycosidic Bond

19 / 20

What bonds hold the chains together, and make the these fibres strong?

Ionic

Peptide

Hydrogen

20 / 20

Which molecule is NOT glucose ?

Your score is

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 charge will be on the hydrogen atoms in this molecule?

A full negative charge

A partial Negative charge

A partial positive charge

3 / 20

In this experiment bacteria were grown in a growth medium containing N¹⁵. What isN¹⁵?

An isomer of Nitrogen.

An isochrome of Nitrogen

An isotope of Nitrogen

4 / 20

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

TRUE

FALSE

5 / 20

Which direction does the enzyme move along the template strand A?

3' to 5'

5' to 3'

6 / 20

Name the pentose sugar found in DNA.

Dioxyribose

Deoxyribose

Dideoxyribose

7 / 20

How do you reduce the effect of a competitive inhibitor?

Decrease the amount of substrate.

Increase the amount of substrate.

Reduce the pH.

8 / 20

Which letter on the above graph is the ' Saturation' point?

9 / 20

What substance are enzymes made out of?

Amino Acids

Fatty Acids

Polysaccharides

10 / 20

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

11 / 20

Triglycerides are good at storing energy. Which part of the molecule stores the most energy?

Glycerol

The bond between the glycerol and fatty acid

The fatty acid

12 / 20

What type of reaction is the formation of a triglyceride from its subunits?

Condensation

Hydrolysis

Lipolysis

13 / 20

Which of these three molecules is a fatty acid?

14 / 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

15 / 20

It forms strong, straight fibres called what ?

Myofibres

Microfibrils

Myosin

16 / 20

Name the polymer in the picture.

Amylose

Amylopectin

Cellulose

17 / 20

Which monomer is starch made out of?

Alpha Glucose

Beta Glucose

Fructose

18 / 20

Which diagram shows a glycosidic bond - A or B ?

19 / 20

What type of reaction is used to join two monosaccharides?

Hydrolysis

Condensation

Phosphorylation

20 / 20

Which of the following is NOT a monosaccharide?

Lactose

Galactose

Glucose

Your score is

Cells Random Retrieval

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

1 / 20

What happens to a B lymphocyte when it is activated?

Agglutination

Divides by Mitosis

Phagocytosis

2 / 20

What type of transport is osmosis?

Active Transport

Diffusion

Something else.

3 / 20

What piece of equipment can you use to measure the colour change? (spell it correctly)

4 / 20

Beetroot is a purple vegetable, the cells of which contain a pigment called Betalain. 4 tubes are set up with water and beetroot incubated at different temperatures: 20, 40, 60 and 80 ⁰C. which tube would you predict shows beetroot incubated at 20 ⁰C?

5 / 20

In a suspected lung cancer tissue sample, a histopathologist observed 19 cells out of a total of 320 in mitosis. The average mitotic index for healthy human lung tissue is 0.04. Is the patient likely to have cancer or not?

Likely to have Cancer

Not likely to have cancer

6 / 20

If you were to investigate mitosis in plant tissue, which part of a plant would you choose to look at?

Pallisade cells in a leaf

Root Tips

Phloem cells in the stem

7 / 20

Put these letters in the correct order

D, C, A, B, E

D, C, E, B, A

D, C, B, E, A

8 / 20

Name the area where the sister chromosomes together, and attach to the spindle fibres here. (Spell it correctly)

9 / 20

What term is given to describe G1 phase, S phase and G2 phase combined? ( Spell it correctly)

10 / 20

Which type of electron microscope produced this image?

TEM

SEM

11 / 20

Which type of electron microscope show the density of the specimen as a dark patch?

TEM

SEM

TEM & SEM

12 / 20

Which type of electron microscope produces a 2D image?

TEM

SEM

TEM & SEM

13 / 20

What does SEM stand for?

Scanning Electron Micriscope

Sensitive Electron Microscope

Superior Electron Microscope

14 / 20

Which of the following organelles are visible with a light microscope?

a) Nucleus
b) Lysosomes
c) Chloroplasts

A & B

A & C

A, B & C

15 / 20

What term describes the ability to see two separate points, as two separate points. Rather than one large point on an image ? (You need to spell it correctly!)

16 / 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

17 / 20

The image shows palisade cells in a leaf. Line A (width) measures 8mm, and the magnification of the image is x10,000. What is the actual width (A) of the palisade cell?

8 μm

1.25 μm

0.8 μm

18 / 20

True or False : plasmids are passed on by binary fission only.

TRUE

FALSE

19 / 20

What is structure F called?

Nucleus

Plasmid

Nucleosome

20 / 20

What substance is layer A made out of?

Cellulose

Other' Polysaccharides

Glycoprotein

Your score is

Exchanges of Substances with the Environment Random Retrieval

This quiz contains all the questions in the Exchanges of Substances with the Environment section. The website will pick 20 questions at random.

1 / 20

In the mass flow hypothesis, the water potential is reduced in the phloem near the sources. What will happen to water movement?

Water will move into the source cells via osmosis, from the phloem. Reducing the pressure in the phloem.

The same amount of water will move in as move out as it is now isotonic.

Water will move into the phloem via osmosis, increasing the pressure.

2 / 20

Which direction will the bubble move?

Towards the beaker

Towards the plant

3 / 20

Xylem or Phloem ? - No end plates on these cells

Xylem

Phloem

4 / 20

What is Cardiovascular Disease?

The same as CHD : when the arteries of the heart become damaged, often associated with a build up of fatty deposits.

When the arteries of the brain become damaged, often associated with a build up of fatty deposits.

When any blood vessels, including those of the heart, brain and lungs become damaged, often associated with a build up of fatty deposits.

5 / 20

What has happened at position D?

The Atrioventricular valves open.

The Atrioventricular valves close.

The Semi- Lunar valves open.

6 / 20

What has happened at position A?

The Atrioventricular valves open.

The Atrioventricular valves close.

The Semi- Lunar valves open.

7 / 20

Which chamber do you think the blue line represents?

Aorta

Atrium

Ventricle

8 / 20

Which chamber do you think the green line represents?

Aorta

Atrium

Ventricle

9 / 20

Cardiac Output ( CO) = Stroke Volume (SV) X Heart Rate ( HR). What is the cardiac output of an athlete with a SV of 95 cm³ , and a HR of 52 bpm?

4.94 dm³ hr^-1

4940 dm³ min^-1

4.94 dm³ min^-1

10 / 20

What happens during Ventricular Systole?

Atrial wall is relaxed, but the ventricular wall is contracted. The Atrioventricular valve is closed, but the Semi Lunar valve is open.

Atrial wall is relaxed, but the ventricular wall is contracted. The Atrioventricular valve is open, but the Semi Lunar valves are closed.

Atrial and ventricular walls are contracted, and the Atrioventricular valve is closed. The Semi Lunar valves are open.

11 / 20

Does this bar cart show a correlation between number of cigarettes smoked, and the risk of CVD?

Yes

12 / 20

Which type of blood vessel has the widest lumen?

Atery

Vein

Arteriole

13 / 20

In which direction ( if any) , would the curve be for human foetal haemoglobin?

Same as human adult

14 / 20

Why is it useful that the Bohr Effect reduces the percentage saturation of Haemoglobin with oxygen?

reduction in saturation also causes a reduction in partial pressure, so a concentration gradient is maintained.

The oxygen has unloaded from the haemoglobin, so it can be exhaled via the lungs.

The oxygen has unloaded from the haemoglobin, so it is available for aerobic respiration in the tissues

15 / 20

Which term describes that guard cells when the plant has plenty of water available?

Turgid

Flaccid

Plasmolysed

16 / 20

Oxygen diffuses out of the tracheoles directly into what?

Respiring body cells.

The insect's open circulatory system.

Air Sacs.

17 / 20

What is 'Tidal Volume'?

Average volume inhaled and exhaled when at rest.

Average volume inhaled and exhaled during exercise.

Maximum volume inhaled and exhaled during a deep breath.

Minimum volume inhaled and exhaled at rest.

18 / 20

Some animals are adapted to higher temperatures in their environment. Which of the following is an example of this ?

Large ears decrease surface area to volume ratio.

Large ears increase surface area to volume ratio.

Large ears can fan the body, carrying away hot air.

Large ears look cute.

19 / 20

How have multicellular organisms adapted to not being able to absorb everything via diffusion over their surface?

A Transport System

Exchange Systems

Transport and Exchange Systems

Moving to maintain a concentration gradient.

20 / 20

What is the volume of the same palisde cell measuring 100 µm by 40 µm?

160,000 µm³

5,600µm³

400,000 µm³

1,600,000µm³

Your score is

Genetic Variation & Information Random Retrieval

This quiz contains all the questions in the Genetic Variation & Information section. The website will pick 20 questions at random.

1 / 20

What type of selection is shown on the graph?

Length of a giraffe's neck.

Thickness of blubber in a weddel seal.

Human Birth Weight.

2 / 20

The Western Corn Rootworm has developed resistance to a protein pesticide found in transgenic crops. The protein no longer damages the digestive tract of the insect.

Physiological

Anatomical

Behavioural

3 / 20

Stray dogs in the Moscow Subway have learnt to beg for food, and are able to identify humans most likely to feed them. What type of adaptation is this ?

Physiological

Anatomical

Behavioural

4 / 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.

5 / 20

Which of the following will reduce genetic diversity in a population?

Mutation

Genetic Bottleneck

Migration

6 / 20

Two of the above mutations will always cause a non functional protein. Why?

They add or remove an amino acid.

They alter both strands of the double helix.

They cause a frame-shift in the triplet code.

7 / 20

Which of the following gene mutations will have the least dramatic effect on the polypeptide produced?

Addition

Substitution

Deletion

8 / 20

The goat cardiomyocyte has 30 pairs of chromosomes. How many chromatids will be present in each cell formed at the end of meiosis Telophase 2?

9 / 20

What is the main cause of variation between siblings?

Recombination

Mutation

Independent Segregation

10 / 20

Is Anaphase 2 more similar to Anaphase 1, or Anaphase in mitosis?

More similar to Anaphase 1.

More similar to anaphase in mitosis.

11 / 20

There are now two identical copies of each chromosome, held together by the centromere. Which term best describes these identical copies?

Homologous Chromosome

Sister Chromatids

Homozygous Chromosomes

12 / 20

On this diagram, what does C represent?

Loci

Homologous Chromosomes

Centromeres

13 / 20

What molecule does the tRNA carry?

A specific amino acid

A specific base

A specific fatty acid

14 / 20

What is the name of the modification of pre-mRNA in eukaryotes?

Translating

Ligating

Splicing

15 / 20

During Transcription, the two DNA strands are separated. What attracts free floating RNA nucleotides to the exposed bases?

Negative charges on the phosphate group.

Partial charges on the organic base.

OH groups on the deoxyribose.

16 / 20

On this diagram, what does A represent?

Sister Chromatids

Homologous Chromosomes

Sex Chromosomes

17 / 20

True or False : The sex chromosomes ( X and Y) are not an homologous pair?

TRUE

FALSE

18 / 20

What is a 'sister chromatid' or 'sister chromosome'?

The same chromosome ( same number e.g. 21) but possibly with different alleles. Can be linear, or X shaped.

An identical copy of a chromosome, with identical alleles. Joined by the centromere to form a X shape.

A pair of linear, single chromosomes.

Two X sex- chromosomes (XX) .

19 / 20

Which of the following is not coded for by a gene?

Polysaccharide

Ribosomal RNA

tRNA

Polypeptide

20 / 20

Which type of DNA is not circular?

Mitochondrial

Plant Nuclear

Chloroplast

Bacterial

Your score is

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