Review the key concepts, formulae, and examples before starting your quiz.
🔑Concepts
The Cell Theory states that all living organisms are made of cells, and the cell is the basic unit of life.
The Nucleus acts as the control center of the cell and contains genetic material in the form of (Deoxyribonucleic acid).
Mitochondria are known as the 'powerhouse' of the cell where aerobic respiration occurs to produce energy in the form of .
Chloroplasts are found only in plant cells and some protists; they contain chlorophyll and are the site of photosynthesis where (glucose) is produced.
The Cell Membrane is a semi-permeable lipid bilayer that controls the movement of substances like , , and in and out of the cell.
The Cell Wall is a rigid outer layer made of cellulose, providing structural support to plant cells; it is absent in animal cells.
Ribosomes are small organelles responsible for protein synthesis.
Vacuoles store nutrients and waste products. Plant cells typically have one large central vacuole that maintains turgor pressure using .
📐Formulae
💡Examples
Problem 1:
A student observes a plant cell under a microscope. The image size of a chloroplast is measured to be , and the magnification used is . Calculate the actual size of the chloroplast in micrometers ().
Solution:
Explanation:
Using the magnification formula, we divide the image size by the magnification. Since , we convert the result to get the final answer in the correct unit.
Problem 2:
Identify which organelle would be most abundant in a muscle cell that requires a high amount of energy to function.
Solution:
The Mitochondria.
Explanation:
Mitochondria are responsible for cellular respiration, represented by the equation . Since muscle cells require significant energy for contraction, they contain a higher density of mitochondria compared to other cells.