No student devices needed. Know more
30 questions
A
B
C
D
In a plant, what is formed by a group of xylem vessels?
a cell
a tissue
an organ
an organ system
A
B
C
D
Which organelles are present in large numbers in cells that produce insulin?
nuclei and mitochondria
ribosomes and mitochondria
rough endoplasmic reticulum and cell walls
vesicles and nuclei
In which part of the cell is oxygen used to release energy from nutrient molecules?
mitochondrion
ribosome
rough endoplasmic reticulum
vesicle
The diagram shows different types of cells.
Which structure do all these cells have?
cell membrane
cell wall
chloroplast
nucleus
The diagram shows a student’s drawing of two guard cells. Which label line is not correct?
A
B
C
D
Which description of the heart is correct?
The heart is an organ, containing several systems, which forms part of the circulatory tissue.
The heart is an organ, containing several tissues, which forms part of the circulatory system.
The heart is a system, containing several organs, which forms part of the circulatory tissue.
The heart is a system, containing several tissues, which forms part of the circulatory organ.
The diagram shows a specialised cell cut in half.
What does this diagram indicate about the structure of this cell?
The cell has a cell wall.
The cell is concave on each side.
The cell is long and thin.
The cell is red and carries oxygen.
Which diagram shows the appearance of a plant cell several minutes after it has been placed in a concentrated solution of sugar?
The diagram shows an experiment to demonstrate the movement of molecules.
After one hour, the water in the beaker turned red. What is the most likely reason for this colour change?
Molecules of red ink move through the membrane by diffusion.
Molecules of red ink move through the membrane by osmosis.
Molecules of water move through the membrane by diffusion.
Molecules of water move through the membrane by osmosis.
Why does oxygen diffuse into the blood from an alveolus in the lungs?
The oxygen concentration in the alveolus is greater than the carbon dioxide concentration in the blood.
The oxygen concentration in the alveolus is greater than in the blood.
The oxygen concentration in the blood is greater than in the alveolus.
The oxygen concentration in the blood is greater than the carbon dioxide concentration in the alveolus.
The diagram shows two cells. The net movement of water is from cell X to cell Y.
What causes water to pass from cell X to cell Y?
water potential is higher in cell X and active transport occurs
water potential is higher in cell X and osmosis occurs
water potential is lower in cell X and active transport occurs
water potential is lower in cell X and osmosis occurs
Which structure provides the best surface for diffusion?
atrium
bronchioles
ileum
trachea
A student cuts out four pieces of carrot root of equal size. The pieces are treated as shown in the diagram, and then left for two hours.
After two hours, which piece of carrot will be the smallest?
Which process in humans does not use energy released from respiration?
cell division
diffusion of oxygen
muscle contraction
protein synthesis
Small molecules are used as the basic units in the synthesis of large food molecules.
Which statement is correct?
Amino acids are basic units of carbohydrates.
Fatty acids are basic units of glycogen.
Glycerol is a basic unit of oils.
Simple sugar is a basic unit of protein.
The diagram shows part of a protein molecule.
What does X represent?
amino acid
fatty acid
glycerol
sugar
A
B
C
D
A
B
C
D
An amino acid is deaminated. This is the removal of
the carbon-containing part.
the nitrogen-containing part.
the oxygen-containing part.
the sulfur-containing part.
A
B
C
D
A food stain on a table cloth is where meat cooked in oil has been spilt. It is washed in a biological washing powder. Which combination of enzymes should be in the washing powder to remove the stain?
amylase and lipase
lipase and protease
pectinase and amylase
protease and pectinase
A
B
C
D
The diagram shows the effect of an enzyme working in the human digestive system.
What would reduce the rate of production of amino acids?
removing the amino acids as they are formed
increasing the amount of protein
raising the temperature to 40 °C
raising the pH to 7.5
A
B
C
D
An enzyme in potato cells causes oxygen to be produced from hydrogen peroxide. Cubes of potato were incubated with hydrogen peroxide at different temperatures. The numbers of bubbles of oxygen released per minute were counted at each temperature. The table shows the results.
The results suggest the optimum temperature for the enzyme is between which two values?
15°C and 35°C
35°C and 45°C
35°C and 55°C
45°C and 55°C
What happens to most enzymes above 60°C?
They are denatured.
They are destroyed by white blood cells.
They are digested.
They are made more active.
. What is a characteristic of all catalysts?
They are broken down in the reaction.
They are made of protein.
They are not changed by the reaction.
They do not change the rate of the reaction.
Which substance is an enzyme?
bile
fibrinogen
lipase
maltose
Explore all questions with a free account