The smallest part of an element that still exhibits the chemical characteristics of that element is

an electron

an atom

a chemical bond

a proton

an orbital

Answer and Explanation

The Correct Answer is B

A. an electron: An electron is a subatomic particle; it doesn’t retain the chemical properties of the element.
B. an atom: The atom is the smallest unit of an element that maintains its chemical identity and properties.
C. a chemical bond: A bond is the interaction between atoms, not a part of an element.
D. a proton: A proton is also a subatomic particle; it contributes to identity (atomic number) but isn’t an element by itself.
E. an orbital: An orbital is a region around the nucleus where electrons are likely to be found-it is not a unit of matter.

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Correct Answer is C

Explanation

A. osmosis: Osmosis is passive (requires no energy), so it will still occur even if mitochondria are poisoned.
B. facilitated diffusion: Facilitated diffusion uses transport proteins but does not require ATP-still functional without mitochondria.
C. active transport: Active transport requires ATP, which is produced by the mitochondria. Blocking mitochondria interrupts ATP production, halting active transport.
D. through channels: Movement through ion channels is usually passive (e.g., diffusion), and does not require ATP.

A. triglycerides B. eicosanoids C. steroids D. phospholipids

Correct Answer is D

Explanation

A. triglycerides: Triglycerides are stored in fat cells, not a major component of membranes.
B. eicosanoids: These are signaling molecules, not structural components of the plasma membrane.
C. steroids: While cholesterol (a steroid) is present in membranes, it's not the most abundant.
D. phospholipids: The plasma membrane is primarily made of a phospholipid bilayer, forming the main structural framework.

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The smallest part of an element that still exhibits the chemical characteristics of that element is

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Naxlex Comprehensive Predictor Exams

A selective poison that blocked the function of the mitochondria was used on a group of cells. Which of the following mechanisms for crossing the membrane would most likely be interrupted by the presence of this poison?

Correct Answer is C

Explanation

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Correct Answer is D

Explanation

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