module 1: what is life Flashcards
where do cells come from
pre existing cells
what does the structure of a cell or protein mean
the structure determines the function
can cells communicate with each other
yes they can
are virus alive
no
why are viruses not alive
because they are no comprised of cells, they cannot extract energy, cannot replicate
what are the 2 theory’s of the forces of life
1) life formed spontaneously
2) extra terrestrial life
what is a proto-cell
a lipid based semipermeable structure that allows some things in and some things out
- happens when lipids are put into water due to its hydroscopy properties
what are the 4 biomacromolecules
-proteins
-lipids
-carbohydrates
-nucleic acids
what are lipids comprised of
C, H and O
do lipids contains lots of oxygen
no, this means they are insoluble in water
why are lipids insoluable in water
because they are comprised of long hydrocarbon chains (non polar)
can lipids store energy
yes they can
what is a lipid made up from (structure)
phosphate head- which is hydrophilic water loving
fatty acid tail- hydrophobic (water hating)
what is a condensation reaction
building up a molecule, water is released
what is a hydrolysis reaction
breaking down of a molecule, water is needed
what are the 2 types of fatty acids
1) unsaturated
2) saturated
what is a saturated fatty acid
a fatty acid that only contains carbon carbon single bonds. this increases dispersion forces and allows these fatty acids to be solid at room temp
- more energy is required to break these bonds
what is an unsaturated fatty acid
a fatty acid that contains one carbon carbon double bond, these molecules are typically liquids at room temp because they contain a kink in the chain that decreased dispersion forces, thus less energy is needed to break the bonds
what are the 3 elements that a carbohydrate is made up of
C, H, O
what are carbohydrates used for
-source of energy
- structure (cellulose in plants)
what is the formular of a carbohydrate
(CH2)n
what is a monosaccharide
a single sugar molecule
what is a disaccharide
2 sugar molecules joined together
where is the hydroxyl group located on an alpha sugar
down the bottom
where is the hydroxyl group located on a beta sugar
up the top
what is a glycosidic link
the bond that joins 2 sugars together
-this bond is a —O— bond
- this process is known as condensation
what happens when glucose and glucose is bonded together
results in maltose (alpha 1-4)
what happens when galactose is bonded to glucose
results in lactose (beta 1-4)
what happens when glucose is bonded to fructose
results in sucrose (alpha 1-4)
what is cellulose
a long chain molecule that has little branching which creates a really strong cell wall
- a molecule in the cell wall of plants
is starch
- a molecule that used to store energy in plants
is starch branched
yes it is branched but only to a small degree
where does the branching occur in starch
at C1 and C6
what is glycogen
a molecule that stores energy in humans
is glycogen branched
yes
what are the bases in DNA
A, T, C and G
what are the bases in RNA
A, U, C and G
what are the pyrimidines
C, U, T
- only contain one hexagon
what is a purine
A and G
- contain 2 hexagons joined together
what direction does DNA run in
runs in a 5’ to 3’ direction
what bond joins 2 nucleotides together
a weak hydrogen bond
what is a monomer of a protein
amino acid
what does an animo acid consist of
- central carbon, hydrogen, R group, a carbonyl group and an amine group
what are some of the functions of proteins
- enzymes
- defense
- storage
- transport
- structure