B4- The Processes Of Life Flashcards
Name three things that plant cells have and animal cells don’t?
Cell wall
Vacuole
Chloroplasts
What is the function of:
a) The Nucleus
b) Mitochondria
c) The Cell Membrane
d) The Cytoplasm
a) Nucleus contains the DNA
b) Where reactions take place
c) Holds the cell together
d) Where proteins are made
Yeast cells have mitochondria and a nucleus. True or false?
True
Give a definition of an enzyme
Enzymes are proteins that speed up chemical reactions
Describe the ‘lock and key’ model.
The lock and key model is where a substrate joins to an enzymes active site and the substrate has be the correct shape to fit into the active site.
Name two things that affect how quickly an enzyme works.
Temperature
Ph
Name two things that the energy released by respiration is used for.
Join molecules together
Make muscles contract
What type of respiration, aerobic or anaerobic, releases more energy per glucose molecule?
Aerobic
Write the word equation for aerobic respiration.
Glucose+oxygen»>carbon dioxide+water+(energy released)
Give an example of when human cells respire anaerobically.
Doing exercise vigorously
Anaerobic respiration releases energy. What else does it produce in:
a) Animal cells
b) Yeast cells
a) It can produce lactic acid in animal cells.
b) It produces ethanol and carbon dioxide
Briefly describe how bread is made using yeast.
Yeast ferments the carbohydrates in flour and this releases carbon dioxide and causes bread to rise.
What happens during photosynthesis?
Plants use energy from the sunlight to produce food which is glucose. The energy is converted into carbon dioxide and water into glucose and chlorophyll is needed for this to happen
Write the word equation for photosynthesis.
Carbon dioxide+water»>glucose+oxygen
Give three main ways plants use glucose.
Respiration
Chemicals for growth
Stored as starch
Name three factors that can limit the rate of photosynthesis.
Amount of light
Amount of carbon dioxide
Temperature
Describe how to take a transact.
You run a tape measure between two fixed points and then you start at one end of transect and collect the data you want.
Describe how you might use a quadrat when investigating plants.
You can see how much of the ground is covered by a plant species using a quadrat. You can count how much of the quadrat is covered by the species. This will give you the percentage covered
What is an identification key?
It’s a bunch of questions that you can use to figure out what a plant is.
Give a definition of diffusion.
Diffusion is the passive overall movement of particles from a region of their higher concentration to a region of their lower concentration.
Give two examples of chemicals that can move in or out of leaf cells by diffusion.
Carbon dioxide
Oxygen
What is osmosis?
Osmosis is the overall movement of water from a dilute to a more concentrated solution through a partially permeable membrane
