Bio 104 Exam/ Bio123 Exam / Bio101Exam
All Reviewed and Updated 2026/2027
All 900 Questions With Correct Answers
and Explanations Guaranteed Pass Already
Graded A+
About 25 of the 92 natural elements are known to be essential to life. Which 4 of
these 25 make of 96% of living matter? - Answer✔️carbon, hydrogen, nitrogen,
oxygen
Knowing just the whole number of an element allows inferences about which of
the following? - Answer✔️the number of protons plus neutrons in the element
When two atoms have the same level of attraction for electrons, the type of
interaction between these two atoms can be described as - Answer✔️nonpolar
covalent bond
What is the difference between covalent bonds and ionic bonds? -
Answer✔️covalent bonds involve the sharing of electrons between atoms;
ionic bonds involve the electrical attraction between atoms of opposite charge
Chemical bonding's: covalent bonds - Answer✔️formed by the sharing of
electrons between 2 atoms (e.g. H2o).
• atoms that form covalent bonds not only gain extra potential energy, they
become more stable because of more electrons on outer orbits.
• strongest type of chemical bonding in biological molecules
• allowing cells to build larger molecules and macromolecules.
*very strong bond; very difficult to break but once broken it releases lots of
energy.
Electronegativity - Answer✔️the attraction of an atom for shared Electrons.
,If the atoms in a molecule have similar electronegativity, the electrons remain
equally stored between 2 nuclei and the covalent bond is said to be non-polar.
If one element is more electronegative, it pulls the shared electrons closer to
itself, Creating polar covalent bond.
Chemical bonding's: hydrogen bonds - Answer✔️weakest chemical bond; but
very important bc it plays a key role in forming internal shaping and folding
of larger molecules.; can break and be remade again.
• hydrogen atoms contain only 1 proton and 1 electron, as a result when it is
sharing its electron with another atom, it has a partial
Positive charge (i.e. H+).
• h+ tends to be attracted to the partial negative charge of oxygen (o-) and
nitrogen (n-), forming hydrogen bonds.
Important properties of water (h2o): high polarity - Answer✔️partial electrical
charges of oxygen and Hydrogen atoms in water molecules cause polarity,
allowing water to interact with ions and other polar molecules.
Important properties of water (h2o): heat storage - Answer✔️hydrogen bonds
formed between water Molecules can absorb heat when they break (release
heat when they are formed), minimizing temperature changes in
Living organisms.
Important properties of water (h2o): high heat of vaporization - Answer✔️it takes
a lot of energy to break many hydrogen bonds in water before evaporation is
possible.
Important properties of water (h2o): low density of ice - Answer✔️in cold
temperature, hydrogen bonds in water spread farther apart, forming ice
crystal which is less dense than liquid water, and as a result ice can float on
water.
This prevents freezing of lakes.
Important properties of water (h2o): cohesion - Answer✔️hydrogen bonds hold
water molecules together, which allows water to be transported upward in the
vascular system of plants.
Water as a powerful solvent - Answer✔️ions and polar molecules are
,Attracted to the partial charges of water molecules, allowing these molecules to be
dissolved in water and from new chemical
Behavior.
The element present in all organic molecules is - Answer✔️carbon
A carbon atom is most likely to form which of the following bonds with other
atoms? - Answer✔️covalent bonds
Which two functional groups are always found in amino acids? -
Answer✔️carboxyl and amino
Which of the following is not a correct monomer/polymer pairing defining a
macromolecule? - Answer✔️amino acid/dna
Which of the following best summarizes the relationship between dehydration
reactions and hydrolysis? - Answer✔️dehydration reactions assemble polymers,
and hydrolysis reactions break down polymers
The smallest unit show below is: - Answer✔️atom
In the scientific method, a formulation of a hypothesis occurs before the: -
Answer✔️it comes first
During the citric acid cycle which is not produced: - Answer✔️nadph
A process which occurs in muscle cells during periods of oxygen deprivation is: -
Answer✔️anaerobic respiration
Atp is involved in the process of: - Answer✔️active transport
Phagocytosis is a type of: - Answer✔️endocytosis
Golgi complex - Answer✔️protein processing
Lysosomes - Answer✔️contain digestive enzymes that act on particles that are
phagocytosed
, Mitochondria - Answer✔️aerobic cellular respiration
Smooth er - Answer✔️detoxification of alcohol and membrane lipid production
Rough er - Answer✔️its ribsomes produce secretory proteins
Plasma membrane - Answer✔️a fluid mosaic
Thlyakoid - Answer✔️light-dependent reactions
Water - Answer✔️high specific heat
Carbon dioxide - Answer✔️organic fuel for photosynthesis
Cholesterol - Answer✔️confers fluidity
Energy is neither created nor destroyed (t or f) - Answer✔️true
A theory can never be disproven (t or f) - Answer✔️false
A solution with a low ph is more basic than a solution with a high ph (t or f) -
Answer✔️false
Isotopes of the same element differ in their atomic number (t or f) -
Answer✔️false
A neutral elemental atom's atomic number indicates the number of electrons (t or f)
- Answer✔️true
Polar covalent bonds are found linking adjacent water molecules (t or f) -
Answer✔️false
Hydrogen bonds are strong than covalent interactions (t or f) - Answer✔️false
Carbohydrates, lipids, and amino acids are defined as macromolecules (t or f) -
Answer✔️false
All Reviewed and Updated 2026/2027
All 900 Questions With Correct Answers
and Explanations Guaranteed Pass Already
Graded A+
About 25 of the 92 natural elements are known to be essential to life. Which 4 of
these 25 make of 96% of living matter? - Answer✔️carbon, hydrogen, nitrogen,
oxygen
Knowing just the whole number of an element allows inferences about which of
the following? - Answer✔️the number of protons plus neutrons in the element
When two atoms have the same level of attraction for electrons, the type of
interaction between these two atoms can be described as - Answer✔️nonpolar
covalent bond
What is the difference between covalent bonds and ionic bonds? -
Answer✔️covalent bonds involve the sharing of electrons between atoms;
ionic bonds involve the electrical attraction between atoms of opposite charge
Chemical bonding's: covalent bonds - Answer✔️formed by the sharing of
electrons between 2 atoms (e.g. H2o).
• atoms that form covalent bonds not only gain extra potential energy, they
become more stable because of more electrons on outer orbits.
• strongest type of chemical bonding in biological molecules
• allowing cells to build larger molecules and macromolecules.
*very strong bond; very difficult to break but once broken it releases lots of
energy.
Electronegativity - Answer✔️the attraction of an atom for shared Electrons.
,If the atoms in a molecule have similar electronegativity, the electrons remain
equally stored between 2 nuclei and the covalent bond is said to be non-polar.
If one element is more electronegative, it pulls the shared electrons closer to
itself, Creating polar covalent bond.
Chemical bonding's: hydrogen bonds - Answer✔️weakest chemical bond; but
very important bc it plays a key role in forming internal shaping and folding
of larger molecules.; can break and be remade again.
• hydrogen atoms contain only 1 proton and 1 electron, as a result when it is
sharing its electron with another atom, it has a partial
Positive charge (i.e. H+).
• h+ tends to be attracted to the partial negative charge of oxygen (o-) and
nitrogen (n-), forming hydrogen bonds.
Important properties of water (h2o): high polarity - Answer✔️partial electrical
charges of oxygen and Hydrogen atoms in water molecules cause polarity,
allowing water to interact with ions and other polar molecules.
Important properties of water (h2o): heat storage - Answer✔️hydrogen bonds
formed between water Molecules can absorb heat when they break (release
heat when they are formed), minimizing temperature changes in
Living organisms.
Important properties of water (h2o): high heat of vaporization - Answer✔️it takes
a lot of energy to break many hydrogen bonds in water before evaporation is
possible.
Important properties of water (h2o): low density of ice - Answer✔️in cold
temperature, hydrogen bonds in water spread farther apart, forming ice
crystal which is less dense than liquid water, and as a result ice can float on
water.
This prevents freezing of lakes.
Important properties of water (h2o): cohesion - Answer✔️hydrogen bonds hold
water molecules together, which allows water to be transported upward in the
vascular system of plants.
Water as a powerful solvent - Answer✔️ions and polar molecules are
,Attracted to the partial charges of water molecules, allowing these molecules to be
dissolved in water and from new chemical
Behavior.
The element present in all organic molecules is - Answer✔️carbon
A carbon atom is most likely to form which of the following bonds with other
atoms? - Answer✔️covalent bonds
Which two functional groups are always found in amino acids? -
Answer✔️carboxyl and amino
Which of the following is not a correct monomer/polymer pairing defining a
macromolecule? - Answer✔️amino acid/dna
Which of the following best summarizes the relationship between dehydration
reactions and hydrolysis? - Answer✔️dehydration reactions assemble polymers,
and hydrolysis reactions break down polymers
The smallest unit show below is: - Answer✔️atom
In the scientific method, a formulation of a hypothesis occurs before the: -
Answer✔️it comes first
During the citric acid cycle which is not produced: - Answer✔️nadph
A process which occurs in muscle cells during periods of oxygen deprivation is: -
Answer✔️anaerobic respiration
Atp is involved in the process of: - Answer✔️active transport
Phagocytosis is a type of: - Answer✔️endocytosis
Golgi complex - Answer✔️protein processing
Lysosomes - Answer✔️contain digestive enzymes that act on particles that are
phagocytosed
, Mitochondria - Answer✔️aerobic cellular respiration
Smooth er - Answer✔️detoxification of alcohol and membrane lipid production
Rough er - Answer✔️its ribsomes produce secretory proteins
Plasma membrane - Answer✔️a fluid mosaic
Thlyakoid - Answer✔️light-dependent reactions
Water - Answer✔️high specific heat
Carbon dioxide - Answer✔️organic fuel for photosynthesis
Cholesterol - Answer✔️confers fluidity
Energy is neither created nor destroyed (t or f) - Answer✔️true
A theory can never be disproven (t or f) - Answer✔️false
A solution with a low ph is more basic than a solution with a high ph (t or f) -
Answer✔️false
Isotopes of the same element differ in their atomic number (t or f) -
Answer✔️false
A neutral elemental atom's atomic number indicates the number of electrons (t or f)
- Answer✔️true
Polar covalent bonds are found linking adjacent water molecules (t or f) -
Answer✔️false
Hydrogen bonds are strong than covalent interactions (t or f) - Answer✔️false
Carbohydrates, lipids, and amino acids are defined as macromolecules (t or f) -
Answer✔️false
