451. Which of the following is not a human organ system?
A. Integumentary
B. Muscular
C. Epithelial
D. None of these
452. Which of the following does not depend on the depth of the aquatic environment in a predictable way?
A. Salinity
B. Temperature
C. Penetration by sunlight
D. None of these
453. The quantity of available nutrients __ from the lower levels of the energy pyramids to the higher ones:
A. Increases
B. Decreases
C. Remains stable
D. None of these
454. Which of the following is not a major subdivision of the biosphere?
A. Hydrosphere
B. Stratosphere
C. Lithosphere
D. None of these
455. Vaccination is synonymous with __ immunity:
A. Natural active
B. Artificial passive
C. Artificial active
D. None of these
456. When a patient’s immune system becomes reactive to a drug, this is an example of:
A. Superinfection
B. Drug resistance
C. Allergy
D. None of these
457. What is the smallest unit of heredity?
A. Chromosomes
B. Gene
C. Nucleotides
D. None of these
458. Pellagra is a disease of?
(A) Heart
(B) Kidney
(C) Brain
D) Skin
459. Which gland in the body produces T-Cells?
(A) Heart
B) Liver
(C) Thyroid glands
(D) None of the above
460. Vitamin which makes young bones strong is?
(A) Vitamin A
(B) Vitamin B
(C) Vitamin C
D) Vitamin D
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