Worksheets1-100 MCQs Biology Mid
Total questions: 100
Worksheet time: 50mins
A localized group of organisms that belong to the same species is called a
biosystem.
community.
population.
ecosystem.
family.
In what way(s) is the science of biology influencing and changing our culture?
by helping us understand the relevance of evolution to human health.
by revealing how mutations in genes can lead to disease.
by providing new tools for forensic investigations.
all of the above.
none of the above.
To understand the chemical basis of inheritance, we must understand the molecular structure of DNA. This is an example of the application of which concept to the study of biology?
evolution.
emergent properties.
reductionism.
feedback regulation.
the cell theory.
Which of the following sequences represents the hierarchy of biological organization from the least to the most complex level?
molecule, cell, organ, tissue, organism.
organism, tissue, organ, cell, molecule.
molecule, cell, tissue, organ, organism.
ecosystem, population, community, organism.
biosphere, ecosystem, community, population.
About 25 of the 92 natural elements are known to be essential to life. Which 4 of these 25 elements make up approximately 96% of living matter?
C, H, O, Fe.
C, H, O, Na.
C, H, O, N.
C, N, O, Na.
C, H, O, P.
In the term trace element, the adjective trace means that
the element is required in very small amounts.
the element is required in large quantities.
the element is easily detectable.
the element is essential but not required.
the element is toxic.
What is the simplest unit of matter that can be distinguished by its physical or chemical properties?
atom.
element.
molecule.
isotope.
ion.
Although all forms of life require iron, other elements are required only by certain species.
True
False
Only in prokaryotes
Only in eukaryotes
Only in plants
The reactivity of an atom arises from
the average distance of the outermost electron shell from the nucleus.
the existence of protons in the nucleus.
the placement of the electrons in shells
around the nucleus
the number of electrons in the outermost
shell.
the number of neutrons in the nucleus
In what type of microscope does visible light pass through a specimen and turn through glass lenses?
electron
light
scanning
transmission
confocal
Which of the following is a correct statement about the relationship between natural selection and evolution?
Natural selection is the mechanism that leads to evolution.
Evolution is the mechanism that leads to natural selection.
Natural selection and evolution are the same process.
Evolution occurs without natural selection.
Natural selection prevents evolution.
The core theme of biology, which explains both the unity and diversity of life, is
genetics.
ecology.
evolution.
metabolism.
cell theory.
Which of the following is not a property of life?
Order.
Energy processing.
Regulation.
Immortality.
Response to the environment.
A hypothesis is
a proven fact.
a tentative explanation.
a theory.
an observation.
data.
In scientific inquiry, a model is
always accurate.
never used.
a simplified representation of a complex system.
a final conclusion.
only for experiments.
The experimental approach taken in current biological investigations presumes that
biological "laws" are not absolute.
experiments must be repeated many times.
all variables must be controlled.
hypotheses are proven true.
data is always quantitative.
Which of the following is an example of inductive reasoning?
All mammals have hair, therefore dogs have hair.
All observed swans are white, therefore all swans are white.
If a plant is green, it has chlorophyll.
Water boils at 100°C.
Gravity pulls objects down.
Which level of biological organization includes all others?
Population.
Community.
Ecosystem.
Organism.
Biosphere.
Prokaryotic cells are found in the domains
Bacteria and Eukarya.
Bacteria and Protista.
Bacteria and Archaea.
Archaea and Eukarya.
Protista and Eukarya.
Which of the following is a key difference between science and technology?
Science seeks to understand nature, technology applies knowledge.
Technology is based on experiments, science is not.
Science uses tools, technology does not.
Both are the same.
Science is theoretical, technology is practical.
The process of science is
linear.
cyclical.
one-time.
random.
fixed.
A controlled experiment
has no variables.
tests multiple hypotheses.
manipulates one variable.
is always qualitative.
never uses models.
Which of the following is not one of the three domains of life?
Bacteria.
Archaea.
Eukarya.
Protista.
All are domains.
Which kingdom includes fungi, plants, and animals?
Bacteria.
Archaea.
Protista.
Plantae.
None, they are in Eukarya.
The study of life extends from the microscopic scale of molecules to
the global scale of the entire planet.
only cells.
only organisms.
only populations.
only ecosystems.
Which of the following is a unifying theme in biology?
Diversity of species.
Complexity of organisms.
Energy flow.
All of the above.
None of the above.
Emergent properties result from
reductionism.
interactions of components.
isolation of parts.
random chance.
evolution only.
Systems biology is
studying one gene at a time.
ignoring interactions.
modeling complex biological systems.
only for prokaryotes.
not useful.
Which of the following is an example of positive feedback?
Blood clotting.
Temperature regulation.
Blood sugar control.
Heart rate regulation.
DNA is the molecule of
energy.
inheritance.
structure.
movement.
regulation.
Which of the following is not a characteristic of all living organisms?
Metabolism.
Homeostasis.
Reproduction.
Photosynthesis.
Response to stimuli.
The scientific method includes
observation only.
hypothesis only.
experiment only.
conclusion only.
all of the above.
A theory in science is
a guess.
untested.
a well-substantiated explanation.
always true.
a law.
Which domain includes organisms with nuclei?
Bacteria.
Archaea.
Eukarya.
Protista.
Fungi.
Reductionism in biology involves
breaking systems into parts.
studying whole organisms only.
ignoring molecules.
only evolution.
no experiments.
Which of the following is a eukaryotic organism?
E. coli.
Methanogens.
Halophiles.
Yeast.
Cyanobacteria.
The biosphere consists of
only land.
all life and where it lives.
only water.
only air.
only soil.
Which of the following is an autotroph?
Plant.
Animal.
Fungus.
Bacterium (some).
Protist (some).
The cell theory states that
cells are basic units of life.
all organisms are made of cells.
cells come from pre-existing cells.
A and B.
all of the above.
Which of the following is a heterotroph?
Algae.
Cyanobacteria.
Human.
Grass.
Oak tree.
Natural selection acts on
genes.
phenotypes
genotypes
DNA
proteins
Which of the following is not a branch of biology?
Ecology.
Genetics.
Physiology.
Astrology.
Microbiology.
The unity of life is seen in
shared genetic code.
different cell structures.
varied metabolisms.
different reproduction.
no common ancestors.
Which of the following is a prokaryote?
A. Amoeba.
B. Mushroom.
C. E. coli.
D. Human.
E. Fern.
Inquiry in biology often involves
discovery science.
hypothesis testing.
both A and B.
neither.
A, B, and models.
A community includes
one species.
multiple interacting populations.
abiotic factors.
only plants.
only animals.
Which of the following is an ecosystem?
A population of fish.
A forest.
A single tree.
A pond with fish, plants, and water.
A group of birds.
The process by which organisms maintain internal stability is
homeostasis.
evolution.
metabolism.
reproduction.
growth.
Which of the following is a trace element?
Carbon.
Hydrogen.
Iodine.
Oxygen.
Nitrogen.
Biology is the study of
rocks.
stars.
chemicals.
physics.
life.
Which of the following is an example of negative feedback?
Childbirth.
Thermoregulation.
Blood clotting.
Fruit ripening.
Lactation.
The molecule that carries genetic information is
RNA
protein
lipid
Which of the following is a domain of life?
Animalia.
Plantae.
Archaea.
Fungi.
Protista.
The diversity of life arises from
mutations.
natural selection.
adaptation.
all of the above.
none of the above.
Which of the following is not a theme in biology?
Information.
Energy.
Evolution.
Interactions.
Magic.
A population is
same species in an area.
different species.
abiotic factors.
global life.
one organism.
Which of the following uses light microscopy?
TEM.
Compound microscope.
SEM.
AFM.
STM.
The smallest unit of life is
atom.
molecule.
cell.
tissue.
organ.
Which of the following is a eukaryotic feature?
No nucleus.
Circular DNA.
Small ribosomes.
Membrane-bound organelles.
Peptidoglycan wall.
Science cannot answer questions about
morality.
cell structure.
DNA replication.
evolution.
photosynthesis.
The four most common elements in living organisms are
C, H, O, Fe.
C, H, O, Na.
C, H, O, N.
C, N, O, Na.
C, H, O, P.
In the term trace element, the adjective trace means that
the element is required in very small amounts.
the element is not easily detectable.
the element is required in large quantities.
the element is essential but not required.
the element is toxic.
What is the simplest unit of matter that can be distinguished by its physical or chemical properties?
atom.
element.
molecule
isotope
Although all forms of life require iron, other elements are required only by certain species.
True
False
Only in animals
Only in plants
Only in bacteria
The reactivity of an atom arises from
the average distance of the outermost electron shell from the nucleus.
the existence of protons in the nucleus.
the placement of the electrons in shells around the nucleus.
the number of electrons in the outermost shell.
the number of neutrons.
Which of the following best describes the relationship between the atoms described in the figure?
ionic bond.
nonpolar covalent bond.
polar covalent bond.
hydrogen bond.
ion-dipole interaction.
What results from the chemical reaction illustrated in the figure?
a nonpolar covalent bond.
an ionic bond.
a polar covalent bond.
a hydrogen bond.
a peptide bond.
What is the term used for a protein molecule that loses its shape?
denatured.
hydrolyzed.
activated.
folded.
saturated.
Which of the following pairs of elements would be most likely to form an ionic bond?
C and H.
Na and Cl.
N and O.
P and S.
C and N.
What is the atomic number of an element?
the number of protons in its nucleus.
the number of neutrons in its nucleus.
the number of electrons in its outermost shell.
the number of electron shells in its atom.
the number of atoms in a mole.
An atom with an atomic number of 8 has how many electrons in its valence shell?
2.
6.
8.
4.
10.
Which of the following is a nonpolar covalent bond?
A. O-O.
B. Na-Cl.
C. H-O.
D. K-Br.
E. Ca-O.
Water is a polar molecule because
it has equal electrons.
oxygen is more electronegative.
hydrogen is stronger.
it is nonpolar.
it has no charge.
The bond between sodium and chlorine is
covalent.
hydrogen.
ionic.
peptide.
van der Waals.
Isotopes of an element have the same
number of protons.
number of neutrons.
atomic mass.
electrons.
valence.
The mass number is
protons only.
electrons only.
neutrons only.
protons + neutrons.
protons - electrons.
Radioactive isotopes are used in
dating fossils.
medical imaging.
cancer treatment.
all of the above.
A and B only.
Which subatomic particle has no charge?
Proton.
Electron.
Neutron.
Ion.
Nucleus.
Electronegativity is
attraction for protons.
attraction for shared electrons.
repulsion of electrons.
atomic mass.
valence number.
A molecule with unequal sharing of electrons is
polar.
nonpolar.
ionic.
neutral.
radioactive.
Hydrogen bonds are
very strong.
covalent.
ionic.
weak individually.
permanent.
Cohesion in water is due to
hydrogen bonds.
ionic bonds.
covalent bonds.
van der Waals.
hydrophobic.
Water's high specific heat helps
freeze oceans.
boil quickly.
moderate temperature.
evaporate fast.
sink.
Ice floats because
it is heavier.
hydrogen bonds space molecules.
it is polar
it is nonpolar
it is
Water is a universal solvent because
it is polar.
it is nonpolar.
it is ionic.
it is gas.
it is solid.
Hydrophilic means
water-fearing.
oil-loving.
water-loving.
neutral.
charged.
A solution with pH 7 is
neutral.
acidic.
basic.
salty.
buffered.
Acids
accept H+.
donate H+.
donate OH-.
are neutral.
buffer.
Bases
donate H+.
are neutral.
accept H+.
buffer.
are salty.
Buffers
change pH rapidly.
are acids only.
are bases only.
resist pH change.
are water.
The element present in all organic molecules is
carbon.
hydrogen.
oxygen.
nitrogen.
phosphorus.
Carbon has how many valence electrons?
2.
6.
4.
8.
1.
Hydrocarbons are
polar.
nonpolar.
ionic.
acidic.
basic.
Isomers have
same formula, different structure.
different formula.
same structure.
no carbon.
no hydrogen.
Functional groups
are inert.
do not react.
are hydrophobic.
determine chemical properties.
are carbon only.
Hydroxyl group is found in
hydrocarbons.
amines
alcohols
acid
ketones
Carbonyl group is in
alcohols.
amines.
acids.
esters.
aldehydes and ketones.
Carboxyl group is
-OH.
-COOH.
-NH2.
-SH.
-PO4.
Amino group is
-COOH.
-OH.
-NH2.
-SH.
-PO4.
Phosphate group is in
DNA.
proteins.
carbohydrates.
lipids.
hydrocarbons.
