I am in the laboratory separating plasma membranes from the cytoplasm in cell cultures. Using my ultra high powered scanning electron microscope to look at the plasma membrane samples, which of the following would you expect to see in greatest abundance?

triglycerides

eicosanoids

steroids

phospholipids

Answer and Explanation

The Correct Answer is D

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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Correct Answer is A

Explanation

A. compounds that are ionically bonded together: Ionic compounds (like NaCl) dissociate easily in water because water's polarity can separate the positive and negative ions.
B. carbon-hydrogen chains, like saturated fats: These are nonpolar covalent compounds and are hydrophobic, so they don’t dissolve or dissociate well in water.
C. compounds that are covalently bonded together: Covalent bonds are strong and molecules remain intact in water; they don’t dissociate into ions.
D. compounds with covalent and some polar covalent bonds: These might partially dissolve but don’t dissociate readily into ions like ionic compounds do.

A. flagella B. cilia C. microvilli D. spindle fibers

Correct Answer is C

Explanation

A. flagella: Flagella are for cell movement (e.g., sperm), not absorption.
B. cilia: Cilia move fluid or particles across cell surfaces (e.g., respiratory tract), not primarily for absorption.
C. microvilli: Microvilli are tiny projections on intestinal cells that increase surface area for nutrient absorption.
D. spindle fibers: Spindle fibers are used during cell division (mitosis), not absorption.

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I am in the laboratory separating plasma membranes from the cytoplasm in cell cultures. Using my ultra high powered scanning electron microscope to look at the plasma membrane samples, which of the following would you expect to see in greatest abundance?

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Naxlex Comprehensive Predictor Exams

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Explanation

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Correct Answer is C

Explanation

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