Which of the following statements about aerobic respiration is correct?
Enzymes are called biological catalysts because they:
Which of the following are natural barriers to infection?
Ⅲ stomach acid
The following are all minerals EXCEPT for:
In the diagram of a section through a synovial joint, the part labelled X represents the:
Which of the following are examples of environmental variation in humans?
Ⅰ hair colour
Ⅳ body mass
Which of the following are advantages of asexual reproduction in a flowering plant?
Ⅰ Large numbers of offspring are rapidly produced.
Ⅱ Favourable genotypes are maintained from one generation to the next.
Ⅲ The plant does not need to rely on wind or insects for pollination.
Ⅳ Several identical individuals grow close together.
Cells become specialised to carry out different roles.This process is called:
A cell in an embryo divides by mitosis three times in succession. How many cells will be formed from these divisions?
All of the following are organelles EXCEPT for:
The length of an insect such as a grasshopper increases in steps.This is because:
The following are all features of insect-pollinated flowers EXCEPT for:
The white blood cells that produce antibodies are called:
The chemicals that make up the bodies of animals and plants are called:
Which one of the following is NOT an inherited disorder?
The wall of the left ventricle is thicker than that of the right ventricle because:
Anaerobic respiration takes place:
An alternate form of a gene is called an:
Vegetables like cauliflower, cabbage and broccoli have been bred from the original wild brassica plant by:
All of the following processes result in energy loss from an ecosystem EXCEPT for:
Single-celled organisms do not need a transport system because:
Which one of the following foods contains the most energy per 100 g?
Simple sugars are called monosaccharides because:
Decomposers are important in the process of decay because:
When a person who has diabetes injects himself with insulin it:
Genetic engineering involves:
A relationship between two organisms where one organism derives benefits from the relationship and the other organism derives no benefit, but is not harmed, is called:
Which one of the following is NOT a function of the placenta?
75 g of freshly dug soil was placed in an oven at 105 ℃ for 24 hours. It was allowed to cool, then reweighed. If the final mass of the dry soil was 66 g, what was the % water content of the original soil sample?
Enzymes catalyse specific reactions by having an active site where the substrate fits.This theory is called:
Which of one the following statements about phloem cells is NOT true?
The main taxonomic groups in order, starting with the largest, are:
The correct pathway of water through a plant is:
A species of mouse has 32 chromosomes in its muscle cells.What will be the numbers of chromosomes in the mouse′s skin cells and sperm cells?
The main site of action of ADH (antidiuretic hormone).
The following diagram shows a model used to show how breathing movements take place:
Which part of the model represents the diaphragm?
Leaves are thin and flat:
An enzyme which has an optimum pH of 3 will function best in the:
All of the following are components of an ecosystem EXCEPT for:
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