key concepts Flashcards
is a plant cell a prokaryotic or a eukaryotic cell?
a eukaryotic cell (a complex cell)
in which sub cellular structures do most of the reactions for respiration take place?
mitochondria
which sub cellular structure maintains the internal pressure in a plant cell?
vacuole
where are ciliated epithelial cells found?
on the surface of organs
give 2 functions of an egg cell
to carry the female dna and to provide nutrients to the embryo in early stages
why do sperm contain a large number of mitochondria
to provide energy needed to swim to the egg (through respiration)
why is it important that egg and sperm cells are haploid
so that when the egg and sperm cells nucleus combine at fertilisation the resulting cell will have the right number of chromosomes
what is the purpose of the fine adjustment knob on a light microscope?
focus the lens until a clear image appears
is a picometer smaller or larger than a nanometer
smaller
how do enzymes affect the rate of a reaction?
increase the rate of a reaction as they act as biological catalysts
what is an active site of an enzyme
the part of the enzyme which joins on to its substrate to catalyse the reaction
which type of molecule are proteins broken down into
amino acids
what type of enzyme breaks down proteins
protease
T or F, oxygen entering the blood from the lungs is an example of osmosis
false
happens by diffusion
osmosis involves the movement of water
what type of membrane is needed for osmosis to happen
a partially permeable one
