cytology and DNA Flashcards
what are the 10 characteristics of life?
absorption assimilation circulation digestion excretion growth movement respiration reproduction responsiveness
what do all living things require?
water
oxygen
food
heat
what is the smallest unit of all living organisms?
a cell
what is the most basic functional unit of a living organism
the cell
what is a tissue
collection of similarly specialized cells that are adapted to perform a specific function
what is the study of a cell
cytology
what is the study of tissues?
histology
what is an organ
two or more tissue types combined together to perform a specific function
what is a system
group of organs that work together
what is the outer boundary of an animal cell called
cell membrane
if a cell membrane allows only certain substances to pass through, it is…
semi-permeable
water molecules moving from low salt conc to high is called…
osmosis
the organelle that is the controlling body of the cell is the ….
nucleus
the organelle which is the site of protein synthesis is…
ribosomes
how many pairs of chromosomes does each human body cell contain
23
the process by which a cell creates two identical daughter cells is called…
meiosis
nucleus
- encloses the DNA
- this is where genes are TRANSCRIBED
Endoplasmic reticulum
- storage of the important substances
- transport DNA transcripts out of the nucleus.
Ribosomes
- translate DNA transcripts into PROTEIN
- where protein synthesis occurs
Golgi apparatus
directs DNA products to stay in or go out of the cell
Mitochondria
produces ATP for the cell; aka powerhouse of the cell
lysosomes
breakdown of cell waste or substances toxic to the cell
vacuoles
storage of substances in the cell; think how ‘vacuums’ store stuff
cytoskeleton
provides structural support for the cell and its organelles influencing shape; transport system for substances w/in the cell
centrosome
produces microtubules
centriole
a bundle of microtubules near the centrosome
cytoplasm
- is the fluid that consists of all the contents outside of the nucleus and enclosed within the cell membrane of a cell.
- fluid part of protoplasm
- nucleus is not included in the cytoplasm
protoplasm
colourless material consisting of the living part of the cell
-collection of cell membrane, cytoplasm AND NUCLEUS
plasma layer
lipid bi-layer, has hydrophilic and hydrophobic sides, only permeable to certain substances via diffusion or passive/active transport
what is each layer of plasma membrane called…
leaflet
hydrophobic side of leaflet is…
on the inside, hiding from the aqueous environment
hydrophilic side of the leaflet is…
on the outside
diffusion
doesnt require energy
4 kinds of diffusion
- lipid soluble through phospholipid matrix
- water soluble through protein channels-gated or non gated
- carrier mediated transport- ex.facilitated diffusion
- osmosis of water through protein channels.
active transport
requires energy(atp)
2 types of active transport
- direct active transport..ex sodium-potassium pump
2. Indirect active transport- ex. co-transport
phagocytosis is..
devouring cell action
ex. white blood cells killing dangerous toxic bacterium.
motor proteins
live inside nerve cells, travels through cell using cytoskeleton. Road is like cytoskeleton in cell and traffic is like the travelling proteins.