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
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.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. cellulose: Humans lack the enzyme cellulase, so we cannot break down cellulose, a plant polysaccharide, for energy.
B. starch: Starch is digestible; humans have amylase to break it down into glucose.
C. glycogen: Glycogen is stored in human liver and muscle and is easily digested.
D. monosaccharides: These are already single sugar units, like glucose, and require no digestion.
Correct Answer is D
Explanation
A. Brain: The brain is the control center, not the effector.
B. Shivering: Shivering is a response, not an anatomical structure. The effector must be a structure that performs an action.
C. Thermoreceptors: These are the sensory receptors (detectors), not effectors.
D. Skeletal muscles: Skeletal muscles are the effectors that contract to produce shivering, generating heat in response to cold.
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