17325081
Description
Flashcards by Paige Snowling, updated more than 1 year ago
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Created by Paige Snowling
about 5 years ago
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| Question | Answer |
| Which sub-cellular structure controls the activities inside the cell? | The nucleus is the sub-cellular structure that controls the activities inside the cell. |
| Where are proteins made in a cell? | Ribosomes are the place in which proteins are made. |
| Write down three structures that are found in plant cells but not in animal cells | Three structures that are found in plant cells but not animals cells are the permanent vacuole, chloroplasts and the cell wall. |
| What is the function of cell sap? | The function of cell sap is to support the plant. |
| Where is DNA found in a bacterium? | The DNA in a bacterium is found in small loops called plasmids |
| Arrange these structures in order of size: Bacterium, liver cell, nucleus, ribosome | BIGGEST: liver cell nucleus bacterium SMALLEST: ribosome |
| A nucleus is measured as 0.005mm in diameters. How many micrometres is this? | 0.005milimeteres is equal to 0.5micrometres |
| How many chromosomes are there in each human body cell? | There are 46 chromosomes in each human body cell, which is equal to 23 pairs of chromosomes |
| Why is it important that the chromosomes are copied before mitosis takes place? | It is important that chromosomes are copied before mitosis takes place so that each new cell gets the full amount of chromosomes. |
| What is a stem cell? | A stem cell is a cell that is not specialised and can divide to form various types of cells. |
| Why does a plant have a meristem at the tip of the shoot and the tip of each root? | A plant has a meristem in these places to produce new cells so that the root and shoot can grow. |
| What is required for substances to be absorbed against a concentration gradient? | Energy for respiration is required for substances to be absorbed against a concentration gradient. |
| Why do cells differentiate? | Cells differentiate to become specialised and more efficient. |
| Why do sperm cells contain a lot of mitochondria? | Sperm cells contain a lot of mitochondria to provide energy for the sperm to swim. |
| What is a group of cells with a similar structure and function called? | A group of cells with a similar structure and function are called a tissue. |
| What is the function of epithelia? | The function of epithelia is to cover the body. |
| Is the heart, a tissue, an organ or an organ system? | The heart is an organ. |
| What type of molecule is an enzyme? | An enzyme is a protein molecule. |
| Give two factors that affect the rate at which enzymes work? | Two factors that affect the rate at which enzymes work is the concentration of the enzyme and the temperature. |
| What type of enzyme breaks down lipids? | The enzyme that breaks down lipids is lipase. |
| Where are protease enzymes produced in the body? | Protease enzymes are produced in the pancreas, stomach and the small intestine. |
| Where is bile produced? | Bile is produced in the liver. |
| Which component of blood makes it clot? | The component of blood that makes it clot are called platelets. |
| How are red blood cells adapted to carry oxygen? | The ways in which red blood cells are adapted to carry oxygen is that they have no nucleus, they have a biconcave structure and they also have haemoglobin which the oxygen latches to. |
| What type of blood vessel carries blood away from the heart? | The blood vessel that carries blood away from the heart is called the artery. |
| In which chamber does deoxygenated blood enter the heart? | The chamber in which deoxygenated blood enters the body is called the right ventricle. |
| What do the heart and veins contain to prevent backflow of blood? | The heart and veins contain valves to stop the backflow of blood. |
| State whether each of these diseases are communicable or non-communicable. a)flu b)Scurvy c)lung cancer | flu-communicable scurvy-non-communicable lung cancer-non-communicable |
| hy can spending too long in the sun result in skin cancer? | Spending too long in the sun can result in skin cancer because the UV light can trigger cancer. |
| Give one risk for type two diabetes. | One risk for type two diabetes is being overweight. |
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