Placement Test AS level Biology V01
Which of the following is the structure of one DNA mononucleotide?
2) Messenger RNA (mRNA) and transfer RNA (tRNA) are involved in protein synthesis.
The diagram shows the sequence of bases in part of a DNA template (antisense) strand and the mRNA molecule formed during protein synthesis.
DNA template strand
|
A |
T |
G |
C |
C |
G |
T |
T |
Which letter indicates when the atrioventricular (mitral) valves close?
4) Red-green colour blindness is an inherited condition.
The table shows some statistics on red-green colour blindness in some countries.
Complete the table to show the number of people who are red-green colour blind in India and the percentage of people who are red-green colour blind in Malaysia, respectively.
The drawing shows a hydra with body length of 4.8 mm.
This hydra has an actual body length of 1.8 mm. Which is the magnification of this drawing?
6) A hydra has a hollow body that is made up of two layers of cells. Which is the adaption of hydra for gas exchange?
7) The graphs show differences in some features of blood vessels.
Which graph shows the permeability of the blood vessels?
8) Prenatal testing is used to screen for genetic disorders in developing embryos.
Phenylketonuria (PKU) is one genetic disorder that is screened for by prenatal testing. This disorder is inherited in a similar way to cystic fibrosis.
Which is the correct genetic diagram of PKU?
The photograph shows the rhizomes of a ginger plant.
These rhizomes have high levels of antioxidants. Some people believe that eating these rhizomes reduces the risk of CVD.
Which of the following is not the reason why eating these rhizomes may help to prevent CVD?
A student made a drawing of a cross-section of the bottom of the stem of the celery plant before it was placed into the beaker of stain.
One hour after being placed into the beaker of stain, the student observed a cross-section from half way up the celery stem.
Which of the following would be a different colour due to the presence of the stain?
11) Eye colour in humans is an example of polygenic inheritance. Two of the genes giving rise to this characteristic are found on chromosome 15.
One gene can give rise to more than one type of protein through post-transcriptional changes to the mRNA. One of these changes is the removal of introns.
Which is incorrectly described how different proteins can be synthesised from this mRNA that has had introns removed.
12) Plant cell walls contain cellulose.
How many of the following statements about cellulose molecules are correct?
- contain α-glucose molecules
- contain 1,4 and 1,6 glycosidic bonds
- form microfibrils
13) A certain structure contained 60 cells.
The mitotic index of cells from structure A was calculated as 15%.
Calculate the number of cells in structure A which were in mitosis.
14) The lack of some inorganic ions in soil can affect the yield of fruit from crop plants.
The photograph shows part of a vine plant growing in soil lacking certain ions. The vine plant shown has yellow leaves and reduced growth.
Which ion is lacking in the soil this plant grows?
16) A mimic octopus can change shape to look like other organisms.
The photographs show a venomous sea snake, a mimic octopus looking like a venomous sea snake.
Why does the mimic octopus change its appearance to look like a venomous sea snake?
17) The wound healing properties of an extract from plants were investigated.
Treatments were tested on four groups of six rats with identical skin wounds. The treatments were applied to the wounds twice a day. The time taken for the wounds to heal was recorded.
The table shows the treatment applied to each group and the results of this investigation.
