WorksheetsBiology Test 1
Total questions: 76
Worksheet time: 39mins
What statement best describes "biology"?
the study of natural selection
the study of how organisms are related to one another
the science of life
the naming of organisms
by definition, an organism that is eukaryotic:
possesses a nucleus
is unicellular
is a protist
possesses organ system
In living organisms, chemical reactions responsible for growth, repair, and nutrition are actively referred to as:
metabolism
development
adaptation
homeostasis
The primary purpose of homeostasis is:
convert an organism to live in a harmful environment
provide unlimited growth within an organism
accept responses to stimuli
maintain a constant internal environment
What is the purpose of the flagella of cells?
they generate the cell's metabolism
they provide movement for the cell
they contract muscles
they generate cell signaling
What is the smallest chemical unit that retains the characteristic properties of a given element?
atom
molecule
tissue
cell
what is an end product of cellular respiration?
oxygen
glucose
carbon dioxide
sugar
Which stimulus most directly causes the Venus flytrap to catch an insect
touch
sound
gravity
scent
which statement best describes autotrophic organisms?
autotrophs are exemplified by animals and bacteria
autotrophs cannot carry out cellular respiration during the day.
autotrophs depend on heterotrophs for food and energy
autotrophs synthesize macromolecules from CO2, water, and energy
Using the Linnaean system of nomenclature, corn is named Zea mays. What is the specific epithet in this name?
Zea
corn
Zea mays
mays
which organizational unit included the fewest species of organisms?
community
class
ecosystem
population
Which is a characteristic of a good hypothesis?
it can be proven to be true
it represents important conclusions
it is a statement of fact
it can only be tested once
it is falsifiable
which is a byproduct of photosynthesis?
water
oxygen
glucose
carbon dioxide
when tissues organize, what do they form?
an organ
an atom
a cell
a nucleus
All members of the same species occupying the same area at the same time constitute a(n):
community
population
ecosystem
biosphere
similar families of organisms are next grouped together in the same:
class
phylum
kingdom
order
genus
The scientific name for coffee is Coffea arabica. More specifically, the species' name is arabica.
true
false
A hypothesis cannot be tested.
true
false
Two domains of prokaryotes are Bacteria and Fungie
true
false
similar orders are placed in the same class
true
false
An organism that reproduces asexually produces genetically variable offspring
true
false
what role does FUNGI play in the energy cycle?
decomposer
primary producer
secondary consumer
primary consumer
what role does a PLANT play in the energy cycle?
decomposer
primary producer
secondary consumer
primary consumer
what role does a BIRD play in the energy cycle?
decomposer
primary producer
secondary consumer
primary consumer
what role does a CATERPILLAR play in the energy cycle?
decomposer
primary producer
secondary consumer
primary consumer
The atomic mass determines the identity of an element
true
false
A solution having a pH of 8 is slightly acidic
true
false
what differentiates an organic compound from an inorganic compound?
an organic compound contains carbon
an organic compound is basic rather than acidic
an organic compound lacks isotopes
an organic compound contains two or more atoms
How can we identify a particular element?
by its number of electrons
by its number of protons
by its number of neutrons
by its amount of energy levels
A chlorine atom has 17 protons and 18 neutrons. What is its atomic mass?
18 amu
17 amu
1 amu
35 amu
Nitrogen has 5 valence electrons in its valence shell. How many electrons does it need to gain to complete its valence shell?
8
2
7
3
1
Which of the following is a common oxidizing agent?
carbon monoxide
iron
zinc
oxygen
lithium
A liquid with a pH of 7 is considered a(n) ______ solution.
neutral
basic
acidic
Which substance is an example of a very strong acid?
bleach
seawater
lemon juice
coffee
milk
Isotopes differ from each other with respect to the number of
electrons only
protons only
neutrons only
both protons and electrons
both neutrons and protons
water molecules have a strong tendency to stick to one another, a property known as __________.
capillary action
osmosis
cohesion
adhesion
which statement best describes an atom?
a substance that cannot be broken into a simpler substance
a substance that is held together by covalent bonds
a substance cannot burn
a substance that is soluble in both acid and base
a substance that is composed of more than one kind of atom
Which substance is a reactant in the following chemical equation?
CO2+H2O↔H2CO3
oxygen
hydrogen
water
carbonic acid
carbon
Sugar dissolves readily in water because it is a(n) ________ substance.
hydrophobic
adhesive
hydrophilic
evaportive
A base is defined as a(n) _____ acceptor.
proton
anion
electron
cation
neutron
sticking together of like molecules
cohesion
surface tension
capillary action
adhesion
enables certain insects to walk on water
cohesion
surface tension
capillary action
adhesion
tendency of water to move in narrow tubes
cohesion
surface tension
capillary action
adhesion
sticking together of unlike molecules
cohesion
surface tension
capillary action
adhesion
Since carbon has 4 valence electrons, it can complete its valence shell by forming a total of 4 hydrogen bonds.
true
false
A disaccharide is composed of 2 monosaccharides joined by a glycosidic bond
true
false
how many covalent bonds are formed by carbon atoms, producing a wide variety of molecular shapes and sizes?
2
4
7
6
what are compounds that have the same molecular formulas but different structures and different molecules?
isomers
monomers
amyloplasts
thiols
why are hydrogen carbons considered hydrophobic?
hydrocarbons exist as isomers
the hydrogen bonds between hydrogen and carbon are nonpolar
the covalent bonds between carbon atoms are polar
the covalent bonds between hydrogen and carbon are nonpolar
Which is the main structural component?
fatty acid
glucose
cellulose
sugars
starches
Glucose and fructose are ______ because they have identical molecular formulas but their atoms are arranged differently
polar
structural isomers
tertiary
geometric isomers
enantiomers
which of the following is sometimes referred to as animal starch?
sugars
cellulose
glycogen
starch
fatt acid
_________________ are isomers that are mirror images of each other.
amino groups
structural isomers
enantiomers
disaccharides
geometric isomers
What is the purpose of regulatory proteins?
to defend against foreign invaders
to catalyze a specific chemical reaction
to control the expression of specific genes
to store nutrients
to strengthen and protect cells and tissues
__________ is a region where a polypeptide chain forms a uniform helical cell.
alpha globin
beta-pleated sheet
a-helix
beta globin
why is ATP important in a living organism?
like all other nucleic acids, it stores hereditary information
It is an important structural component of cell membranes
Like RNA, it acts as a source code for the formation of proteins
It can transfer some of its energy to other chemicals
It is easily converted to starch for long-term storage
most are nonpolar
lipid
carbohydrate
protein
nucleic acid
cellulose
lipid
carbohydrate
protein
nucleic acid
has 20 different monomers
lipid
carbohydrate
protein
nucleic acid
a beta-pleated sheet is one typical structure
lipid
carbohydrate
protein
nucleic acid
monomers are joined by a glycosidic linkage
lipid
carbohydrate
protein
nucleic acid
contains purines and pyrimidines
lipid
carbohydrate
protein
nucleic acid
may contain thymine
lipid
carbohydrate
protein
nucleic acid
cholesterol
lipid
carbohydrate
protein
nucleic acid
What is the most abundant monosaccharide and used as the primary energy source?
Glucose
Fructose
Cellulose
Disaccharide
__________ are polymers that are made up of 3 parts
Nucleotides
Carbohydrates
Lipids
Protein
What 3 parts make up Nucleotides
A five-carbon sugar, either deoxyribose (in DNA) or ribose (in RNA)
One or more phosphate groups (make the molecule acidic)
A nitrogenous base (nitrogen-containing ring compound)
An acidic base (acid-containing compound)
which is the correct organization of the taxonomic category?
species, genus, family, order, class, phylum, kingdom, domain
genus, species, order, family, class, kingdom, domain, phylum
species, domain, genus, kingdom, family, phylum, order, class
what are the 4 primary elements that make up >96% of the mass of most organisms?
oxygen
carbon
hydrogen
nitrogen
sodium
what are cations?
atoms with 1, 2, or 3 valence electrons that lose electrons to other atoms and become positively charged
atoms with 5, 6, or 7 valence electrons that gain electrons from other atoms and become negatively charged
what are anions?
atoms with 1, 2, or 3 valence electrons that lose electrons to other atoms and become positively charged
atoms with 5, 6, or 7 valence electrons that gain electrons from other atoms and become negatively charged
what is a neutral solution?
pH 7; equal concentration of hydrogen and hydroxide ions (water)
pH <7; hydrogen ion concentration > hydroxide ion concentration (vinegar)
pH >7; hydrogen ion concentration < hydroxide ion concentration (household ammonia)
what is an acidic solution?
pH 7; equal concentration of hydrogen and hydroxide ions (water)
pH <7; hydrogen ion concentration > hydroxide ion concentration (vinegar)
pH >7; hydrogen ion concentration < hydroxide ion concentration (household ammonia)
what is a basic solution?
pH 7; equal concentration of hydrogen and hydroxide ions (water)
pH <7; hydrogen ion concentration > hydroxide ion concentration (vinegar)
pH >7; hydrogen ion concentration < hydroxide ion concentration (household ammonia)
what 4 nitrogenous bases does DNA contain?
two purines: adenine (A) and guanine (G)
two pyrimidines: cytosine (C) and thymine (t)
two pyrimidines: cytosine (C) and uracil (U)
what 4 nitrogenous bases does RNA contain?
two purines: adenine (A) and guanine (G)
two pyrimidines: cytosine (C) and thymine (t)
two pyrimidines: cytosine (C) and uracil (U)
