Unit 1; cell organelles and microscopes Flashcards
characteristics of living things
made up of cells reproduce-copy of hereditary info; genes use DNA as universal genetic code grow and develop obtain and use materials respond to environment homeostasis means evolve over time; population
biosphere then…
bioms, ecosystem, community, population, and finally organism or individual
magnification of drawing
drawing size divided by actual size
low, med, high magnification
low= 4x medium= 10x high=40x the eye piece magnifies 10x so when its on low, 4x 10= 40x magnification
field diameter =
actual size x number across field
what is the number across the field
how many times the drawing can fit across the view; or field diameter. to find you’d put the image in the microscope to the edge of the view and estimate how many times it will go across.
cell theory
all living things contain cells
cells are the basic unit of structure in all organisms
new cells are created from old cells
prokaryotes
smaller simpler cells such as bacteria that have no nucleus. the genetic material is just in the cell. these cells evolved before the nucleus
eukaryotes
more complex and larger cells with specialized functions; organelles. they contain a nucleus which contains the genetic information.there is greater variety of eukaryotes like single cellular or multicellular organisms.
organelle
specialized structures living in a cell that preform the different functions necessary to the cells survival needs.
cytoplasm
material outside of the nucleus
nuclear envolope
nuclear membrane. double lipid bilayer that surrounds the nucleus
chromatin
material that chromosomes are made out of; protein RNA DNA
chromosome
threadlike structure made of nucleic acid and protein. carries the genetic info in the form of genes
nucleolus
small dense sphere in the nucleus of a cell that makes ribosomes
ribosomes
small particles of RNA and protein. which produce protein by following coded instruction from the nucleus. like a small little protein factory. located on the rough endoplasmic reticulum and also in the cytoplasm
endoplasmic reticulum
ER. it is an internal membrane system where the lipid components of the cell are assembled and proteins.
two types of ER, rough er and smooth er.
rough er; synthesis of proteins because ribosomes are on the surface, assembly of proteins
smooth er; no ribosomes on surface. contains a collection of enzymes that preform specialized tasks.
golgi apparatus
proteins from rough er move in to it and it modifies, sorts and packages the portions for stories and secretion out side of the cell
lysosomes
filled with enzymes that digest, or break down lipids carbohydrates and proteins in the cell that are not needed. it cleans up the cell
vacuoles
storage; water, salts, proteins, carbohydrates. there are bigger vacuoles in plant cells.