Chapter 2 Flashcards
What is the smallest chemical unit of matter
atom
What is element ?
It is matter composed of one type of atom
What is a molecule ?
combination of two or more atom
What is the combination of different types of atoms ?
compound
What is in the center of an atom ?
nucleus
What is the nucleus of an atom composed of ?
protons and neutrons
What is the charge of the protons ?
positive charge
What is the charge of the neutrons ?
neutral charge
Where are the electrons found in an atom ?
outside of the nucleus of an atom on shells of the atom
What is the charge of the electrons ?
negatively charge
What is the purpose of the electron in an atom ?
It is to stabilize the positive charge of the nucleus
How are chemical bonds form between atoms ?
It is formed the interactions of electrons on the outer shells of atoms
What is the goal of every atom and how is it done ?
It is to become chemically stable and this is done by filling the outermost shell with atom
What is an ion ?
It is an atom that is positive or negatively charge
What is the charge of an atom that looses an electron ?
It is positive charge
What is the charge of an atom that gained an electron ?
negative charge
What are type of chemical bonds found in a living organism ?
It is ionic bonding ,covalent bonding and hydrogen bonds
How are covalent bonds form ?
Formed by sharing electrons
What is weakest bond among ionic,covalent and hydrogen bonds ?
hydrogen bonds
What is the purpose of hydrogen bonds ?
It is to serve to bridge separate molecules together
What does organic molecules contain ?
carbon and hydrogen
What are the four major classes of organic molecules make up the building
blocks of life ?
Carbohydrates,Lipids,Proteins and Nucleic Acid
Types of Carbohydrates ?
Monosaccharides-one saccharides
Disaccharides-two saccharides
Polysaccharides-many saccharides
What is the purpose of Lipids ?
It is used to store energy and it is essential to the structure and function of membranes
What are Fats made from ?
Made from a glycerol backbone
+1 or more fatty acids
Monoacylglycerides
1 fatty acid
Diacylglycerides:
2 fatty acid
Triacylglycerides:
3 fatty acid
Types of fatty acid ?
saturated =no double bonds
unsaturated= double bonds
What is phospholipids made up of ?
2 fatty acids,
and a phosphate group
phosphate group
polar and hydrophillic
fatty acid
non polar and hydrophobic
What type of membrane does saturated fatty acid make ?
more solid
What type of membrane does unsaturated fatty acid make ?
more fluid
What are Steroids built on ?
built on hydrophobic 4 ring structure
Which organisms are steroids found ?
Eukaryotes not prokaryotes
What are protein made up of ?
building blocks name amino acid
What element does all amino acid contain ?
Carbon, Hydrogen, Oxygen and Nitrogen
some Sulphur
How many type of amino acid doe s protein typicaly has ?
20
have at least one amino (-NH2) and one carboxyl (-COOH) group
What type of bond does amino acids ?
covalent peptide bond
What is protein ?
polypeptide = chain of amino acid
What are types of nucleic acids ?
DNA-deoxyribonucleic acid
RNA-ribonucleic acid
What are nucleic acid build of ?
building blocks called nucleotide
What are the three parts of nucleotide ?
Nitrogenous base
Pentose sugar- 5 carbon sugar
Phosphate
What are the 2 type of Nitrogenous base?
Purine = 2 rings
Pyrimidine =1 ring
What are the nitrogen base does Purine contains ?
Adenine (A) or Guanine (G)
What does Pyrimidine contains ?
Thymine (T), Cytosine (C), Uracil (U
What are nucleotides joined together ?
by covalent bonds to form a strand of nucleic acid
What are the Nitrogen bases of DNA ?
: A, G, T and C
What is the structure of DNA ?
Double stranded
What type of sugar does DNA has ?
deoxyribose
What is the purpose of DNA ?
Stores the genetic info of all cellular organisms
What is the function of RNA ?
Stores the genetic info of all cellular organisms
What type of sugar does RNA has ?
ribose
What is structure of RNA ?
single stranded
What is the purpose of RNA ?
Involved in communicating the instructions stored in DNA.
Base pairing
A - T (A-U RNA)
G -C