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Bio 203 Study Guide Exam 1 Questions And Actual Answers.

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  • BIO 203
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  • BIO 203

Describe the properties of subatomic elements, elements, and compounds - Answer An element is a substance that cannot be broken down to other substance. Each element consists of unique atoms. Atoms composed of subatomic particles: neutron, proton, electron. Neutrons and Protons form the nucleus ...

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  • November 28, 2024
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  • 2024/2025
  • Exam (elaborations)
  • Questions & answers
  • BIO 203
  • BIO 203
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Bio 203 Study Guide Exam 1 Questions
And Actual Answers.
Describe the properties of subatomic elements, elements, and compounds - Answer An element is a
substance that cannot be broken down to other substance. Each element consists of unique atoms.
Atoms composed of subatomic particles: neutron, proton, electron. Neutrons and Protons form the
nucleus of an atom. Electrons are negatively charged particles that form a cloud around the nucleus. A
compound is a substance consisting of two or more elements in fixed ratio.



How can radioactive isotopes be utilized in biological research? - Answer -Dating fossils (Radioactive
Dating)

-Positron-emission Tomography (PET scan)

-Tracing atoms through metabolic processes

-Diagnosing medical disorders



What determines the chemical behavior of an atom? - Answer depends mostly on number of electrons
in outermost shell called valence electrons



Identify the natural occurring elements in the human body - Answer 96% oxygen, carbon, hydrogen &
nitrogen



What kind of bond occurs when a pair of electrons are shared by two atoms? - Answer covalent bond



How many covalent bonds can form for hydrogen, carbon, nitrogen, and oxygen? - Answer Hydrogen =
1 covalent

oxygen = 2 covalent

nitrogen = 3 covalent

carbon = 4 covalent



Describe week chemical bonds and how these bonds are important - Answer 1. ionic bond: transfers
bonds to another or could be described as stealing a bond from one another in order to complete the
octet rule. A metal with a non metal.

, 2. hydrogen bond: form when a hydrogen covalently bonded to one electronegative atom is also
attached to another electronegative atom



They are important because they reinforce the shapes of molecules and help molecules adhere to each
other



Describe electronegativity and compare non polar vs. polar bonds - Answer electronegativity is an
atoms tendency to "hog" electrons around itself in a chemical bond. In HF(H-F), for example, Fluorine is
extremely electronegative so the electrons of the bond spend nearly all their time around Fluorine,
which gives that side of the molecule a net-negative charge. This partial charge is described as polarity.
In a non-polar molecule, electrons spend their time equally around all the atoms and no one atom
attracts electrons more strongly.



What are the usual electronegative partners in living cells for a hydrogen atom covalently bonded to
water? - Answer nitrogen and oxygen



How do geckos climb walls? - Answer Van Der Waal interactions



Describe the unique structure and properties of water - Answer 1. water is able to donate and accept
hydrogen bonds

2. one of the most important properties of water is that it is significant for life



Identify the five critical properties of water which help to support life - Answer 1. Ice & liquid structures

In ice hydrogen bonds are stable. ice at < 4 Celsius

in liquid hydrogen bonds constantly break and reform. Water is a liquid at a high temperature > 0 Celsius.
Stays in a liquid form if temperature is <100 celsius.

2. Cohesion

Hydrogen bonds hold water molecules together in liquid

3. Moderation of temperature

Heat can be absorbed by breaking water molecules

water molecules are broken when absorbed

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