Get ahead with a $300 test prep scholarship
| Enter to win by Tuesday 9/24
Honors Science Week 17
Terms in this set (26)
How can a molecule be considered alive?
Must be organic, have a metabolism, and be capable of replication
To be organic, a molecule must be
made of carbon and hydrogen
amino acids are the
building blocks of life because they create protein
whats sorts of traces are left by ancient microorganisms?
microscopic ffeatures, isotopic radiotos indicative of life
How do amino acids create proteins?
amino acids are linked together by covalent bonds to form polymers called polypeptide chains
primary protein structure
a sequence of a chain of amino acids
Each polypeptide chain consists of smaller sub-units or amino acids that are linked together. polypeptides serve as the building blocks of proteins.
how are different types of proteins formed/
when polypeptide chains are arranged in a specific order, so each kind of protein has a specificc order
why was the miller urey experiment performed?
To see if amino acids could originate in the environment thought to be present in the first years of Earth's existence,
to stimulate early atmosphere - placed methane, ammonia and hydrogen in a flask of heated water that created vapor
what did they do to the primordial soup
had sparks to stimulate lighting - which they thought could have been the nrg to create it. it worked
What mostly does the job of self replicating life?
DNA. some scientists think the first replication was DNA
the chemical work of cells that organic molecules must do. These chemical reactions help organism to live in environment, grow and reproduce
where does metabolism get energy from?
outer sources and it creates structrues needed in cells.
the chemical reactions that the metabolism creates. these pathways are similar between unicellular bacteria bill yrs ago and most complex life forms today. Evolved very early in earth's history
What are nucleic acids?
Organic molecules that living cells need to store genetic information and pass it to the next generation
What is DNA?
deoxyribonucleic acid - nucleic acid that carries information for nearly living cells today and most of earth's history
What is RNA?
Ribonucleic acid - delivers genetic instructions to the location in a cell where protein is
proteins are long chains of
Instructions for the sequence of the protein...
is copied from genes and carried by RNA to ribosomes where protein is being made to help make it
RNA world hypothesis
RNA is the most primitive organic molecule, and was the first replocator
What is some evidence for the RNA world hypothesis?
it catalyzes protein synthesis, so it could have come before proteins. Encode genetic instructions and carry to duaghter cells. like DNA
if DNA is like an add on and RNA came first...
every living thing
be capable of making RNA. There is a chunk of RNA shared by almost all microorganims
chunk of RNA shared by most microorganisms. All microorganisms need genetic code to function. it can can change w/o changing functionality. 16s RNA changes from species to species
What happens if a researcher comes across mystery bacteria?
Read genetic code in it's 16S RNA sequence, plug it into database. Can ne used to compare genes in all living organisms