Biochemistry of the Cell Flashcards
percentage of water in bones
20%
percentage of water in brain cells
85%
water content is greatest in?
young cells
It forms H bonds with each other
H2O
Five properties of water
cohesion & adhesion
good solvent
lower density as a solid
high specific heat
high heat of vaporization
H bonding between H2O molecules
water is “sticky”
surface tension
drinking straw
Cohesion
H bonding between H2O & other substances
capillary action
Meniscus
water climbs up paper towel or cloth
Adhesion
It makes H2O a good solvent
Polarity
During this season, only upper few inches would thaw
Summer
Resists changes in temperature
H2O
Takes a lot to heat it up
Takes a lot to cool it down
H2O moderates temperatures on Earth
Specific heat
active ingredient in the most widely used insect repellants, effective against mosquitoes, fleas and ticks
DEET
a very very large molecule
macromolecules
Four classes of biological macromolecules:
❑Proteins
❑ Lipids
❑Carbohydrates
❑Nucleic Acid
Contain carbon and hydrogen
Hydrocarbon
Monomer of Lipids
Fatty acids
Monomer of Nucleic acid
Nucleotides
Monomer of Carbohydrates
Monosaccharides
Monomer of Protein
Amino acid
Main source of energy of the body
Simple Carbohydrates
Long term storage for energy
Complex carbohydrates
made up of glucose polymers
Polysaccharides
Polysaccharide comprising glucose monomers
Starch
❑ also a glucose polymer
❑Offers plant support
❑Energy storage
❑Makes up the cell wall
❑Food source for seeds and plant bulbs
Cellulose
❑A branched polymer made up of numerous
glucose monomers.
❑Long-term energy storage found in the liver
❑Quickly broken down into glucose for
immediate energy
Glycogen
broken down for energy
stored energy
the internal organs for protection
Cushion
made up of fatty acid monomers
Fat
Glycerol group with 3 fatty acid chains
Triglycerides
Carbon, Hydrogen, Oxygen
Carbohydrates
Mostly Carbon, Hydrogen, and some Oxygen
Lipids
made up of mostly Carbon, Hydrogen, Oxygen and Nitrogen (some sulfur)
Proteins
Proteins that are involved in creating PROTEINS
Ribosomes
sequence of a chain of amino acids
primary protein structure
hydrogen bonding of the peptide backbone causes the amino acids to fold into a repeating pattern
Secondary protein structure
Three dimensional folding pattern of a protein due to side chain interactions.
Tertiary Protein Structure
Protein consisting of more than one amino acid chain.
Quaternary Protein Structure
❑ Chemical signaler protein produced in the
pancreas
❑ Causes cells in the liver, muscle, and fat tissue to take up glucose from blood and convert it to glycogen that can be stored in the liver and muscles
Insulin
a condition when a person has high
blood glucose (blood sugar),
Diabetes
Proteins in red blood cells that carries oxygen
Hemoglobin
part of immune system
Antibodies
❑ Speed up rate of chemical reactions ( a catalyst)by lowering the energy needed to begin the reaction.
❑ Re-usable; molecule specific (Lock and Key Model).
Enzymes
Information molecule
DNA
thousands of shorter segments of DNA
genes
three nucleotide subsegments
codons
universal information storage molecule for all forms of life
DNA
sugar in all four nucleotides, cyclical molecule
Deoxyribose
This creates consistency in the nucleotide sequences of the two DNA polymers that join together to make a chromosome
Complementary base pairing
❑functions in cellular protein synthesis
❑replaces DNA (deoxyribonucleic acid) as a carrier of genetic codes in some viruses
Ribonucleic acid
carries DNA message to ribosomes
messenger RNA (mRNA)
transfer amino acids to ribosomes
transfer RNA (tRNA)
makes up ribosome-protein factories of the cell
ribosomal RNA (rRNA)
Phosphorus atom with four oxygen atoms bonded to it
Phosphate group
low hemoglobin levels are associated with:
kidney disease, liver disease and anema
high hemoglobin levels are associated with:
Chronic lung disease, dehydration, and heart failure