©PREP4EXAMS@2024 [REAL-EXAM-DUMPS] Monday, July 29, 2024 12:15 PM
BIO 107 - EXAM #1 – CSUN QUESTIONS AND ANSWERS (100% PASS)
All Matter including living organisms, are composed of: - ✔️✔️atoms and combinations of
atoms
Protons are: - ✔️✔️Positively charged particles located in the nucleus
Neutrons are: - ✔️✔️uncharged particles located in the nucleus
Electrons are: - ✔️✔️negatively charged particles found in orbitals surrounding the
nucleus
An Element is: - ✔️✔️a pure substance that cant be broken down into simpler
components by ordinary chemical or physical techniques.
Atoms combine chemically in fixed numbers and rations to form the: - ✔️✔️molecules
Each atom consists of an atomic __________ surrounded by negatively-charged
electrons - ✔️✔️Nucleus
The number of protons in a nuclei are called the: - ✔️✔️atomic number
The nuclei of all atoms also contain uncharged: - ✔️✔️neutrons
mass number = - ✔️✔️(# of protons) + (# of neutrons)
Isotopes are: - ✔️✔️distinct forms of atoms of an element with the same number of
protons but different numbers of neutrons.
Nuclei of some isotopes are unstable and break down giving off particles of matter and
energy, this is: - ✔️✔️radioactivity
The most important applications of radioisotopes are as labels or: - ✔️✔️tracers
1
, ©PREP4EXAMS@2024 [REAL-EXAM-DUMPS] Monday, July 29, 2024 12:15 PM
The region of space where an electron is found most frequently is its: - ✔️✔️orbital
Orbitals make up: - ✔️✔️energy levels or electron shells
electrons in an atoms outermost energy level are its: - ✔️✔️valence electrons
Atoms of reactive elements tend to combine into molecules by forming: - ✔️✔️Chemical
bonds
The five most important chemical interactions in biological molecules are: - ✔️✔️Covalent
bonds, Ionic bonds, Hydrogen bonds, Hydrophobic interactions, and Van Der Walls
Forces
Covalent bonds form when atoms share pairs of: - ✔️✔️valence electrons
for covalent bonds, stronger bonds are: - ✔️✔️shorter than longer bonds
In a nonpolar covalent bond: - ✔️✔️electrons are shared equally
In a polar covalent bond: - ✔️✔️electrons are shared unequally
In a polar covalent bond the atom that attracts the electrons: - ✔️✔️more strongly carries
a partial negative charge.
A cation carries a: - ✔️✔️positive charge
an anion carries a: - ✔️✔️negative charge
ionic bonds have three key features: - ✔️✔️-exert an attractive force
-force extends in all directions
-vary in strength
An atom with a high _________ will hold the electrons more tightly and have partial
negativity - ✔️✔️electronegativity
In nonpolar covalent bonds atoms have: - ✔️✔️no charge
2
BIO 107 - EXAM #1 – CSUN QUESTIONS AND ANSWERS (100% PASS)
All Matter including living organisms, are composed of: - ✔️✔️atoms and combinations of
atoms
Protons are: - ✔️✔️Positively charged particles located in the nucleus
Neutrons are: - ✔️✔️uncharged particles located in the nucleus
Electrons are: - ✔️✔️negatively charged particles found in orbitals surrounding the
nucleus
An Element is: - ✔️✔️a pure substance that cant be broken down into simpler
components by ordinary chemical or physical techniques.
Atoms combine chemically in fixed numbers and rations to form the: - ✔️✔️molecules
Each atom consists of an atomic __________ surrounded by negatively-charged
electrons - ✔️✔️Nucleus
The number of protons in a nuclei are called the: - ✔️✔️atomic number
The nuclei of all atoms also contain uncharged: - ✔️✔️neutrons
mass number = - ✔️✔️(# of protons) + (# of neutrons)
Isotopes are: - ✔️✔️distinct forms of atoms of an element with the same number of
protons but different numbers of neutrons.
Nuclei of some isotopes are unstable and break down giving off particles of matter and
energy, this is: - ✔️✔️radioactivity
The most important applications of radioisotopes are as labels or: - ✔️✔️tracers
1
, ©PREP4EXAMS@2024 [REAL-EXAM-DUMPS] Monday, July 29, 2024 12:15 PM
The region of space where an electron is found most frequently is its: - ✔️✔️orbital
Orbitals make up: - ✔️✔️energy levels or electron shells
electrons in an atoms outermost energy level are its: - ✔️✔️valence electrons
Atoms of reactive elements tend to combine into molecules by forming: - ✔️✔️Chemical
bonds
The five most important chemical interactions in biological molecules are: - ✔️✔️Covalent
bonds, Ionic bonds, Hydrogen bonds, Hydrophobic interactions, and Van Der Walls
Forces
Covalent bonds form when atoms share pairs of: - ✔️✔️valence electrons
for covalent bonds, stronger bonds are: - ✔️✔️shorter than longer bonds
In a nonpolar covalent bond: - ✔️✔️electrons are shared equally
In a polar covalent bond: - ✔️✔️electrons are shared unequally
In a polar covalent bond the atom that attracts the electrons: - ✔️✔️more strongly carries
a partial negative charge.
A cation carries a: - ✔️✔️positive charge
an anion carries a: - ✔️✔️negative charge
ionic bonds have three key features: - ✔️✔️-exert an attractive force
-force extends in all directions
-vary in strength
An atom with a high _________ will hold the electrons more tightly and have partial
negativity - ✔️✔️electronegativity
In nonpolar covalent bonds atoms have: - ✔️✔️no charge
2
