Key Science from test Flashcards
a cell (nucleus) which contains 2 complete sets of chromosomes:
Diploid
a cell (nucleus) which contains 1 complete sets of homologous chromosomes:
Haploid
Difference between meiosis and mitosis?
Meiosis takes place in testes & ovaries, 4 haploid daughter cells , 23 chromosomes
Mitosis takes place in nearly every cell, 2 identical daughter cells, 46 chromosomes
What is the direction of blood through the heart and body?
right atrium, right ventricle, left atrium, left ventricle
How would a artery, capillary, and vein look like?
Artery - Small lumen, thick muscles
Capillary - one blood cell wide
Vein - Biggest lumen
What are the 3 subatomic particle charges?
Proton - positive
Neutron - neutral (no charge)
Electron - negative
substance consisting of two or more metals
alloy
ability to draw metal out into thin wire
ductile
Difference between anion and cation
anion is negative, cation is positive
When there is hydro in an equation what must be a product?
hydrogen gas
How can you protect metals from corrosion?
Paint it, oxide layer, or zinc layer
What are the first four most. reactive metals?
sodium, lithium, magnesium, and aluminium
Name the monomer to make polyethene
ethene
the measure of the amount of matter in an object
mass
the measure of the force of gravity on an object
weight
unit used to measure current
amp
unit used to measure amount of energy carried by the electrons
work
What is work measure in?
Joules
What is the unit for power?
Watts
What is the unit for weight?
Kg
Name a contact force when rubbing a balloon on a jersey and its charge?
Friction and positive
What is the difference between static and current electricity?
Static electricity is when charges collect on a surface (insulators) and do not flow away immediately. Current electricity is the flow of electrons through a material.
What do a and v measure
a - electrical charge
v - energy
