The element that is present in all proteins but not in carbohydrates is:
carbon.
hydrogen.
oxygen.
nitrogen.
The Correct Answer is D
A. carbon: Carbon is the "backbone" of all organic molecules, found in both proteins and carbohydrates.
B. hydrogen: Hydrogen is present in all organic molecules, including both proteins and carbohydrates.
C. oxygen: Oxygen is a key component of both proteins and carbohydrates.
D. nitrogen: Proteins are made of amino acids, which contain an amino group (-NH2). While carbohydrates typically only contain C, H, and O, nitrogen is a defining element for proteins.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
A. Glycerol: This is a component of triglycerides, not Vitamin D.
B. Steroids: Vitamin D is a fat-soluble vitamin synthesized from cholesterol (a steroid) in the skin when exposed to UV light.
C. Prostaglandins: These are tissue hormones derived from fatty acids, not vitamins.
D. Fatty acids: While Vitamin D is fat-soluble, its chemical structure is classified as a secosteroid.
Correct Answer is {"dropdown-group-1":"B"}
Explanation
A. positive: The outside of the neuron is more positive due to a higher concentration of sodium ions (Na+).
B. negative: During the resting membrane potential, the inside of the neuron is negatively charged (typically -70mV) relative to the outside, largely due to internal proteins and the leakage of potassium.
C. equal: If the charge were equal, there would be no membrane potential, and the neuron could not fire an impulse.
D. None of the above: Incorrect, as choice B is the standard physiological fact.
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