Biology (answered_ updated 2022)
any substance that takes up space and has mass is called _____
- matter
what is matter is composed of?
- elements
an ______ is a substance that has specific chemical and physical properties
- element
an _____ is the smallest unit of matter that still retains all the chemical
properties of an element
- atom
can an atom break-down into something smaller, while still retaining the
properties of the original element?
- no
molecules result whenever _____ atoms join together
- 2 or more
what atoms does carbon tend to bond with in an organic molecule?
- hydrogen; oxygen; nitrogen
_____ are molecules that contain more than one element
- compounds
(ex: H2O is a molecule/compound)
what are the strong attractive forces that hold atoms within a molecule?
- intramolecular forces
which type of force exists between molecules?
- intermolecular forces
which type of force is weaker... intra- or intermolecular?
,- intermolecular
which type of force (intra-/intermolecular) determines physical properties?
- intermolecular
_____ are molecules that have the potential of bonding to other identical
molecules through chemical reactions
- monomers
_____ is the process when monomers bond together, and it forms _____
- polymerization; polymers
_____ are substances that have a large # of monomers bonded together
- polymers
what are the 3 varieties of carbohydrates?
- monosaccharides; disaccharides; polysaccharides
monosaccharides have a ratio of precisely _____ _____ per water molecule, and
they have the empirical formula _____
- 1 carbon; (CH2O)n
5 carbon monosaccharides are called _____
- pentoses
6 carbon monosaccharides are called _____
- hexoses
a sugar molecule is classified as an alpha sugar if the hydroxyl (OH) group
points _____ on the first carbon
- down
a sugar molecule is classified as a beta sugar if the hydroxyl (OH) group points
_____ on the first carbon
- up
ribose is a _____ sugar (monosaccharide)
- pentose (five carbon)
, glucose and fructose are _____ sugars (monosaccharides)
- hexose (six carbon)
glucose and fructose are _____ of each other - isomers
what type of carbohydrate results when 2 monosaccharide monomers
bond/join together?
- disaccharide
monosaccharide monomers join together via what type of reaction?
- dehydration/condensation reactions
what functional group and atom combine in a dehydration/condensation
reaction?
- hydroxyl (OH) + hydrogen (H)
what type of bond is formed and what is released in a
dehydration/condensation reaction?
- covalent bond formation; release of H2O
what is the opposite of a condensation/dehydration reaction - why?
- A hydrolysis reaction; adds H2O to a covalent bond and splits monomers
apart
what is the name of the bond that forms when a carbohydrate attaches to
another molecule?
- glycosidic
carbohydrates linked to lipids are known as _____
- glycolipids
carbohydrates linked to proteins are known as _____
- glycoproteins
which disaccharide contains 1 glucose and 1 fructose?
- sucrose (table sugar)
which disaccharide contains 1 galactose and 1 glucose?
- lactose