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BIOL 1121-01 Biology 1 for Health Studies - AY2025-T5

BIOL 1121-01 Biology 1 for Health Studies - AY2025-T5

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Water's polarity is, primarily due to:

Its molecular weight.

A partial negative charge on the oxygen atom and partial positive charges on the hydrogen atoms.

The absence of hydrogen bonds.

An equal sharing of electrons between hydrogen and oxygen atoms.

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Which of the following statements about isotopes is true?

Isotopes have the same chemical properties but different physical properties.

Isotopes have the same number of neutrons but different numbers of protons.

Isotopes have the same mass number but different atomic numbers.

Isotopes have the same atomic number but different mass numbers.

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Which of the following statements about water is true?

Water molecules are non-polar, leading to poor solvent properties.

Water molecules form strong hydrogen bonds, leading to high cohesion and surface tension.

Water has a neutral pH due to its equal concentration of H+ and OH- ions.

Water molecules have high vaporization energy, leading to rapid evaporation.

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The octet rule states that:

Atoms tend to gain or lose protons to achieve stability.

Atoms tend to lose electrons to achieve a full outer shell.

Atoms tend to gain, lose, or share electrons to achieve a full outer shell.

Elements in the same group have similar properties.

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Why is a buffer solution important in biological systems?

It provides essential nutrients to cells.

It maintains a stable pH environment for biochemical reactions.

It prevents the growth of microorganisms.

It enhances the color of biological samples under a microscope.

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Why is carbon considered the "backbone" of organic compounds?

Because it can form strong ionic bonds.

Because it has a unique color.

Because it is the most abundant element in organic compounds

Because it can readily form four covalent bonds with other atoms.

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What property of water allows it to have a high surface tension?

High heat capacity

High vapor pressure

Hydrogen bonding between water molecules

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The options below are the characteristic of covalent bonds, EXCEPT:

Occurrence between two non-metal atoms.

Sharing of electrons between atoms.

Transfer of electrons from one atom to another.

Formation of molecules with strong bonds.

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