calculated by multiplying the magnification of the eyepiece by the magnification of the objective lense
Compound Microscope
light microscope that has two lens systems: the objective and the eyepiece
Parfocal
Lens that stays in focus when magnification/focal length is changed.
Parcentered
the object in the center of view will remain in the center when the objective is rotated
Binocular
adapting for or using both eyes
Depth of Field
the distance between the nearest and the furthest objects that give an image judged to be in focus in
Field of View
The extent of the visible image field that can be seen
Working Distance
distance between the front lens of the objective and the coverslip
Osmosis
Process by which molecules of a solvent pass through a semipermeable membrane, equalizing the concentrations on each side
Facilitated Diffusion
process of passive transport which molecules diffuse across membranes with the help of transport proteins
Active Transport
the movement of ions across a cell membrane into a region of higher concentration assisted by enzymes which require energy
Passive Transport
transport of a substance across a cell membrane by diffusion that does not require energy
Tonicity
the state of a solution in respect of osmotic pressure
Hypotonic
lower osmotic pressure
Hypertonic
Increased pressure
Isotonic
having the same pressure
Nucleotides
a compound of nucleosides linked to a phosphate group
Semi-conservative replication
the synthesis of DNA consists of 1/2 original DNA strand and 1/2 new DNA
Anti-parallel
When one strand of the DNA runs in the 5' to 3' direction and the opposite strands runs in the 3' to 5' direction
Codon
a sequence of three nucleotides that together form a unit of genetic code in a DNA or RNA molecule
Anticodon
A sequence of three adjacent nucleotides in transfer RNA that binds to a corresponding codon in messenger RNA and designates a specific amino acid during protein synthesis
Haploid
having a single set of unpaired chromosomes
Diploid
containing two complete sets of chromosomes, one from each parent.
Homologous pairs
A pair of chromosomes having the same gene sequences, each derived form one parent
Sister chromatids
when a single chromosome is replicated into two copies of itself
Chromosome
Long strands of DNA and proteins that contain hereditary information
Centromere
the point on a chromosome by which it is attached to a spindle fiber during cell division.
Kinectochore
another term for centromere
Crossing-over
the exchange of genes between homologous chromosomes, resulting in a mixture of parental characteristics in offspring.