Science semester 1 revision

Rylee Cruz
Flashcards by Rylee Cruz, updated more than 1 year ago
Rylee Cruz
Created by Rylee Cruz over 4 years ago
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Flashcards on Science semester 1 revision, created by Rylee Cruz on 06/02/2016.

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Question Answer
what is a homologous pair of chromosomes? one gene that determines a certain physical factor from the mother and one from the father. These are homologous pairs.
describe a chromosome inside the nucleus of each cell, there are DNA molecules packed into thread like structures called chromosomes.
How many chromosomes in all human body cells. 23 from each parent therefore 46.
what is an allele? alleles are either dominant or recessive and there is one from each parent regarding physical traits.
whats a phenotype? the set of observable characteristics of an individual resulting from the interaction of its genotype with the environment.
whats a genotype? the genes for a particular characteristic present in n organism.
homozygous definition two of the same genotypes.
heterozygous definition different genotypes.
what do genes do tell your body to create proteins
what are gametes sex cells
what is the first cell called the zygote
diagram of a cell cell -nucleus-chromosomes-DNA- proteins
what bases go together? at and gc
what does DNA stand for? deoxyribonucleic acid
what does A,C,T,G stand for a=adenine c=cytosine t=thymine g=guanine
what is meiosis? a type of cell division that results in four daughter cells each with half the number of chromosomes of the parent cell
what is mitosis? a type of cell division that results in two daughter cells each having the same number and kind of chromosomes as the parent nucleus
define genetic modification the deliberate modification of the characteristics of an organism by manipulating its genetic materia
how has gene technology been used to help humans? disease resistant plants, vaccine production and human insulin etc
what is a genetically modified plant? plants used in agriculture, the DNA of which has been modified using genetic engineering techniques. In most cases, the aim is to introduce a new trait to the plant which does not occur naturally in the species.
what is a transgenic animal? animals that have had a foreign gene deliberately inserted into their genome.
what is a plasmid? a genetic structure in a cell that can replicate independently of the chromosomes, typically a small circular DNA strand in the cytoplasm of a bacterium or protozoan
what is recombinant DNA? DNA that has been formed artificially by combining constituents from different organisms
what is distance? how far something travels
what is time? an interval or a period
what is speed? the rate at which something moves
how do you convert km/h to m/s? divide by 3.6
distance formula speed x time
time formula distance / speed
speed formula distance / time
what is deceleration? acceleration that causes an object to slow down.
newtons first law Every object in a state of uniform motion tends to remain in that state of motion unless an external force is applied to it.
newtons second law The acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force, in the same direction as the net force, and inversely proportional to the mass of the object.
newtons third law For every action there is an equal and opposite reaction.
example of newtons 1st law a box sitting on a desk is in uniform motion until a force is applied to it and it is pushed.
example of newtons second law bigger the mass, smaller the acceleration / smaller the mass, bigger the acceleration.
example of third law if a cannon is shot, the equal and opposite reaction occurs to a person standing behind.
what is inertia? the resistance an object has to a change in its state of motion.
define gravity the force of attraction between all masses in the universe; especially the attraction of the earth's mass for bodies near its surface
what is air resistance? Air resistance is a force that is caused by air. The force acts in the opposite direction to an object moving through the air.
what is weight? the force exerted on a body by gravity.
what is mass? the quantity of matter in a body regardless of its volume or of any forces acting on it.
what does acid and metal create? metal salt and hydrogen
how to test for the presence of hydrogen pop test
what does acid and base make? salt and water
acid and metal carbonate makes? carbon dioxide and metal salt
what is limewater used for? to indicate the presence of co2
metal and oxygen? metal oxide
what is incomplete combustion only partial burning of the fuel / due to lack of oxygen or low temperature.
what is complete combustion needs a full supply of oxygen
how to speed up corrosion? adding water especially salt water
what is necessary for corrosion? oxygen
what is ch4 methane
HCC hyrdrochloric cid
H2SO4 sulfuric acid
what is the law of conservation of mass mass of the products must equal the mass of the reactants
what is the name of the group of substances that are used to determine if a solution is basic or acidic? indicators
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