Study guides, Class notes & Summaries

Bias - Answer Inclination of prejudice in a way considered to be unfair Economic Issue - Answer Related to the best use of limited, or scarce resources Environmental Issue - Answer Related to the harmful effects of human activity on the environment Ethical issue - Answer Ethically related aspects that may have affected how research was carried out Implication - Answer Effects or consequences of an action that may happen, although not explicitly stated Influence - An...

what do sensory neurones do - Answer carry nervous impulses from receptors into the central nervous system (CNS) what do motor neurones do - Answer carry impulses from the CNS to the effector organs What do relay neurones do? - Answer relay neurones are intermediate neurones they recieve impulses from a sensory neurone and relay them to motor neurones what are dendrites - Answer carries nervous impulses towards a cell body what is an axon - Answer carry nervous impulses ...

Atomic radius - Answer Size of the atom. Decreases in size with increasing protons or if atom loses electrons (cation) Increases in size with more shells or if atom gains electrons (anion). First Ionisation energy - Answer The energy needed to remove one mole of electrons from an atom in its gaseous atom First ionisation energy down groups - Answer Decreases More shells = more shielding = weaker attraction = easier (less energy) to lose one electron First ionisation ener...

What are the standard units of mass, length and time? - Answer Kilograms, metres and seconds What are the SI prefixes for 10^3, 10^6 and 10^9? - Answer kilo, mega, giga What are the SI prefixes for 10^-3, 10^-6 and 10^-9? - Answer milli, micro, nano What is work done? - Answer The energy transferred in moving something What is power? - Answer the rate at which work is done What happens to a gas when it is compressed? - Answer Particles get closer together Gas pressure...

Are bacteria prokaryotes or eukaryotes? - Answer bacteria name an advantage of visible light microscope - Answer they can observe sub-cellular structures name a disadvantage of light microscope - Answer does not have a very high magnification or resolution name an advantage of electron microscope - Answer has a high resolution and magnification name a disadvantage of electron microscope - Answer they destroy the sample what is the function of the golgi apparatus? - Answe...

What is the function of the mitochondria? - Answer cellular respiration What is the function of the ribosomes? - Answer protein synthesis What is the function of the smooth endoplasmic reticulum? - Answer Synthesis and transport of lipids and carbohydrates What is the function of the Golgi apparatus? - Answer Modified and packaged proteins into vesicles for transport What is the function of the lysosomes? - Answer Digests old cell material and waste What is the function ...

What is an electron shell? - Answer A group of atomic orbitals with the same principal quantum number, n. Also known as a main energy level. What is an electron sub-shell. - Answer A group of orbitals of the same type within a shell. What is an electron orbital? - Answer A region within an atom that can hold up to two electrons with opposite spin. What shape are s orbitals? - Answer Spherical What shape are p orbitals? - Answer Dumb-bell How many electrons can the an s s...

What are myofibrils? - Answer They are cylindrical organelles that run along the length of muscle fibres, they are the site of muscle contraction How are myosin and actin filaments arranged? - Answer In an alternating pattern in sarcomeres, thick myosin filaments overlap with the thin actin filaments at each end What is a pair of muscles called? - Answer An antagonistic pair What is the sarcolemma? - Answer The membrane of muscle fibres what is the mitochandria? - Answer ...

Oscillation - Answer Regularly repeating motion Periodic time - Answer Time taken for one whole cycle of an oscillation Displacement - Answer Distance and direction of an object's change in position from the starting point. Amplitude - Answer The maximum extent of a vibration or oscillation, measured from the position of equilibrium. Frequency - Answer Number of cycles per second EM spectrum - Answer •Radio waves •Microwaves •Infra-red •Visible light •...

Ion another name for a charged particle (when an atom loses or gains electrons) Ionic Bonding The strong force of attraction between positive metal ion and negative non-metal ion Covalent Bonding The strong force of attraction between positive nuclei and the shared pair of electrons Metallic Bonding The strong force of attraction between positive metal ions and the surrounding sea of free electrons Molecule atoms joined by covalent bonds Free (delocalised) electrons electrons that hav...