Biology

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Biology

You will be given 18 biology questions to solve in 30 minutes or 1 minute and 40 seconds (100 seconds) per question.

1 / 18

The following organelles are involved in processing amino acids into glycoprotein:
1. Golgi apparatus
2. Ribsomes
3. RER
Which sequence is correct for this process?

2 / 18

Antibiotics are becoming less effective due to:

3 / 18

Which one of the following would be different in a pair of non­-identical twins?

4 / 18

In a set of genetic crosses the offspring produced showed the same phenotype ratio of 9:3:3:1. Which of the following statements could be true?
1. two genes each with two alleles were studied
2. all parents were heterozygous
3. some offspring had a phenotype different to the parents
4. some offspring had a phenotype the same as the parents

5 / 18

Haemophilia is caused by a recessive allele carried only on the X chromosome. A carrier female and a non haemophiliac male decide to have a child.
Which of the following four statements are correct?
1 they have a 25% chance of producing a haemophiliac son

2 they have a 25% chance of producing a haemophiliac daughter

3 they have a 25% chance of producing a carrier son

4 they have a 25% chance of producing a carrier daughter

6 / 18

A sample of DNA contains 32 % guanine. Which answer shows the percentage of thymine in the same sample?

7 / 18

The diagram below represents the fluid mosaic model of the cell (surface) membrane.

Only two of the labelled molecules have both hydrophobic and hydrophilic areas. Which two molecules are they?

8 / 18

Which one of the following molecules is made in both photosynthesis and respiration?

9 / 18

Which property of water is most important when heat is lost from human skin?

10 / 18

A section of one strand of DNA has a base sequence of:ACG­GCT­GGT­TCC. Which of the following are correct?
1. The other DNA strand would include a CGA triplet.
2. If adenine always binds with 2 H bonds to its complementary base and guanine with 3 H bonds, then each of these triplets will have a total of 8 H bonds.
3. The mRNA sequence transcribed from this DNA sequence would contain 3 uracil bases

11 / 18

Which of the features below may be present in both prokaryotic cells and eukaryotic animal cells?
1 glycogen
2 a cell wall
3 DNA in loops
4 cytoplasm containing rib

12 / 18

The increase in the frequency of one phenotype in a wild population of fish could be due to:
1. an advantageous mutation
2. increased reproductive success of individuals with that phenotype
3. a change in the environment

13 / 18

Which of the following are increased when the level of adrenaline rises in a human?
1. heart rate
2. breathing rate
3. impulse rate in a sensory neurone

14 / 18

Which of the components of DNA listed below are found on the outside of a DNA double helix?
1. Pentose sugar
2. Phosphate
3. Purine bases
4. Pyrimidine bases

15 / 18

Which one of the following labels, i to v, represents a nucleotide?

16 / 18

If a glucose molecule became incorporated as a non­terminal component of starch, which two regions, labelled i to v, would be involved in forming glycosidic bonds?

17 / 18

Which of the following organisms are subject to natural selection?
1. prokaryotes that reproduce asexually
2. single-celled eukaryotes that reproduce sexually
3. organisms living in a changing environment
4. organisms living in a stable environment

18 / 18

The diagram below shows a phospholipid:

When this molecule is broken into a phosphate, glycerol and two fatty acids, the number of water molecules released is:

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