WorksheetsA&P Ch2 Chemical Basis of Life
Total questions: 25
Worksheet time: 5mins
All matter in the universe is composed of one or more fundamental substances known as
compounds
molecules
ions
elements
Organic compounds
are composed solely of ions
are found in all living things
break down to yield acids and bases
react only with inorganic compounds
Which of the following describes an atom?
cannot be broken down further w/o losing properties of the element
consists of negatively charged protons and positively charged electrons
its nucleus consists of protons and electrons
neutrons spin about the nucleus of the atom
An oxidation-reduction reaction is one in which
a double bond occurs
an acid breaks down into hydrogen ions and hydroxyl ions
a gain or loss of electrons takes place
monosaccharides react with disaccharides
The molecular mass of a molecule consists of
the sum of the atomic mass of its atoms
the sum of the masses of protons and electrons
the same as it's mass number
the sum of the number of bonds it forms
when the electrons of one atom are donated to a second atom, the bond that forms is known as a
a covalent bond
a molecular bond
a hydrogen bond
an ionic bond
Atoms of carbon enter into numerous bonds with other atoms because the carbon atom
lacks a single electron in its outer shell
has four electrons in it outer shell
breaks down easily to form an acid
for ionic bonds easily
When a base is placed in water
it attracts oxygen atoms from the water molecules
it releases numerous hydrogen atoms
it attracts hydrogen ions from water molecules and leaves an accumulation of hydroxyl ions
it reacts with weak acids only
Organic compounds composed exclusively of carbon, hydrogen, and oxygen include
proteins and fats
proteins and nucleic acids
nucleic acids and fats
carbohydrates and fats
All of the following are monosaccharides except
fructose
sucrose
galactose
glucose
Glycogen and starch are similar because
both are composed of glucose units
both are useful for structural materials in the cell
both are monosaccharides
both contain nitrogen
The polysaccaharide used as dietary fiber in the human body is
glycogen
lactose
cellulose
glucose
Starch is composed of thousands of units of
lactose
glycogen
fructose
glucose
Glycogen may be found in large amounts in the
human bone marrow
human brain
human liver
human spleen
Two major components of fats are
glucose and amino acids
glycerol and fatty acids
nitrogen and sulfur
amino acids and organic acids
Fats are stored in large, clear globules in the cells of
connective tissue
nerve tissue
epithelial tissue
adipose tissue
The linkage formed between amino acids in a protein is known as a(n)
ionic bond
peptide bond
hydrogen bond
amino bond
All of the following apply to proteins except
they are used as enzymes
they are composed of amino acids linked together
they are found in tendons, ligaments, and cartilage
they are composed exclusively of carbon, nitrogen, and oxygen
The information dictating the sequence of amino acids in proteins is located in the
lysosome of the cell
endoplasmic reticulum of the cell
cell membranes and their proteins
nucleus of the cell
RNA differs from DNA because RNA contains
adenine but no cytosine
cytosine but no adenine
adenine but no uracila
uracil but no thymine
The carbohydrate portion of a DNA molecule consists of
ribose
galactose
deoxyribose
cellulose
RNA may be found
in the nucleus and cytoplasm of the cell
only in the nucleus of the cell
only in the endoplasmic reticulum of the cell
in the lysosome of the cell
During the DNA replication process
two strands reunite
two new strands form a double helix
a new and an old strand bind to form a new double helix
the old strand dissolves and only the new strands are left
The essential element of DNA that determines the order of the amino acids in proteins is
the placement of the phosphate molecules
the existence of ribose molecules
the sequence of nitrogenous bases
how the deoxyribose molecules are linked to the phosphate group
All of the following are amino acids except
valine
glutamic acid
tyrosine
guanine
