Science

• How would the this base sequence be coded on mRNA?

  ACAGTGC

  UGUCACG
• Unit for length


  meters (m)
• Unit for mass


  kilograms (kg)
• Unit for time


  second (s)
• Unit for electric current


  ampere (amp)
• Unit for temperature


  kelvin (K)
• Unit for amount of substance 


  mole (mol)
• Unit for luminous intensity


  candela (cd)
• The International

  System (SI) is the system of units that scientists have agreed upon and is legally enforced in almost all

  parts of the world.
• Density is the mass of the object per unit volume.
• In science, work is done only when the force applied to an object actually moves the object in the

  direction of the force. This is represented as:

  WORK = force x displacement
• Energy is the ability to do work or the ability to exert

  force on an object and make it move.
• A cell consists of three parts: the cell membrane, the nucleus, and, between the two, the cytoplasm.
• A cell is the structural and fundamental unit of life. Robert Hooke was the first Biologist who discovered cells.
• Cell Theory

  1. All living organisms are made of cells.
  2. Cells are the basic unit of life.
  3. All cells come from pre-existing cells.
• Cell membrane, also called plasma membrane serves as a support or to protect the cell. It is the outer covering of a cell within which all other organelles, such as the cytoplasm and nucleus, are enclosed.
• In a solution, the substance that does the dissolving is called solvent.
• Water is a good solvent due to its polarity and small molecular size.
• A solution that cannot hold any more solute at room temperature would be a saturated solution.
• Ethanol dissolved in water would be an example of a solution between two miscible liquids.
• A saturated solution is a solution that has dissolved as much solute as it is capable of dissolving.
• Liquids which mix with each other are called as miscible liquids.
• Liquids that do not mix with each other are called as immiscible liquids.
• Example: Coconut oil and water are immiscible liquids.
• Example: Milk and water are miscible liquids.
• Sugar dissolving in water is a physical change.
• Boiling an egg is an example of chemical change.
• The chemicals after a chemical change have properties different to the chemicals before the change.
• Cell membrane - an outer covering that separates the cell's interior from its surrounding environment.
• Cytoplasm - consisting of a jelly-like cytosol within the cell in which other cellular components are found.
• Nucleus - contains genetic material (DNA) and controls all activities of the cell.
• Cytoplasm - contain organic compound necessary for the survival of the cell.
• Prokaryotic cell - mostly single-celled (unicellular) organism that lacks a nucleus or any other membrane-bound organelle.
• Flagella - comparatively longer in length, less, and is found in prokaryotic cells and eukaryotic cells.
• Flagella - help in locomotion.
• Eukaryotic cells have:

  • membrane-bound nucleus
  • numerous membrane-bound organelles
  • several rod-shaped chromosomes
• Some membrane-bound organelles present in eukaryotic cell:

  • Smooth & Rough Endoplasmic Reticulum
  • Golgi-apparatus
  • Chloroplasts
  • Mitochondria
• Nucleus - control center of the cell because it contain the genetic material (DNA).
• Chromosomes - threadlike structures made of protein and a single molecule of DNA that serve to carry the genomic information from cell to cell. 
• Ribosomes - the cellular organelles responsible for protein synthesis.