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BIO 107 - EXAM #1 – CSUN QUESTIONS AND ANSWERS (100% PASS) $11.49   Add to cart

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BIO 107 - EXAM #1 – CSUN QUESTIONS AND ANSWERS (100% PASS)

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BIO 107 - EXAM #1 – CSUN QUESTIONS AND ANSWERS (100% PASS)

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  • August 12, 2024
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©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



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, ©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




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