Characteristics of Organism
State ALL characteristics of a living organism
Movement, Respiration, Sensitivity, Growth, Reproduction, Excretion and Nutrition.
What is osmosis
osmosis is the movement of water molecules from a solution with a high concentration of water molecules to a solution with a lower concentration of water molecules, through a cell's partially permeable membrane.
function as the protein synthesis machinery of the cell. They read the genetic code carried by messenger RNA and use this information to link amino acids together in the correct order to create a polypeptide chain, which then folds into a functional protein.
Name 5 speciallized cells
Neuron, RBC, muscle, root hair, palisade, ciliated, sperm, egg cells.
What is diffusion?
Diffusion is the movement of particles from an area of high concentration to low concentration, until they are evenly spread.
Why is sensitivity critical for an organism’s survival in changing environments?
it allows the organism to detect and respond to harmful stimuli (e.g. predators, temperature changes), helping it adapt, and avoid danger.
Why do animal cells burst if placed in pure water?
Because water enters the cell by osmosis, and since animal cells lack a cell wall, too much water intake causes them to swell and eventually burst (lysis).
Give 3 differences between animal and plant cell
no Cell wall, chloroplasts, big vacoule/vacoule.
name 3 parts of a ciliated cell
Cilia, mitochondria, nucleus, cell membrane, cytoplasm.
Name one example of diffusion in the human body.
Oxygen diffusing from the lungs into the blood in the alveoli.
This life process occurs in mitochondria and provides ATP, the energy currency of the cell, what is this characteristic called?
Respiration
Why does osmosis only involve water molecules and not solutes?
The membrane allows only small molecules like water to pass through, but not larger solute molecules such as sugars or salts in order to balance the concentration of both sides of the membrane.
Which part of the cell that has the partially permeable function
cell membrane
How does a red blood cell adapted to its function
Biconcave shape, has haemoglobin to transport oxygen, lack of nucleus, thin outer membrane, small and flexible.
What factors affect the rate of diffusion?
Temperature (higher = faster), Concentration difference (steeper = faster), Surface area, x`Distance (shorter = faster)