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Of the pathogenic organisms, which of the following are the most complex?

A.

Viruses

B.

Tapeworms

C.

Bacteria

D.

Protozoa

Answer and Explanation

The Correct Answer is B

A. Viruses: Viruses are the simplest pathogens, consisting only of genetic material and a protein coat.

B. Tapeworms: These are the most complex because they are multicellular animals (helminths) with specialized organ systems for reproduction and attachment.

C. Bacteria: These are single-celled prokaryotic organisms, which are more complex than viruses but less complex than multicellular animals.

D. Protozoa: These are single-celled eukaryotic organisms; while complex for a single cell, they lack the tissue and organ complexity of a worm.


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Related Questions

Correct Answer is A

Explanation

A. osteoblasts: These are the bone-forming cells that actively produce and secrete the organic bone matrix.

B. osteocytes: These are mature bone cells that maintain the matrix but are no longer responsible for producing it.

C. osteoclasts: These cells break down or "resorb" bone tissue.

D. chondrocytes: These cells produce the matrix for cartilage, not bone.

Correct Answer is C

Explanation

A. osteoclasts: These cells are responsible for the resorption (breakdown) of bone matrix.

B. osteons: These are structural units of compact bone, not individual cells.

C. osteoblasts: Osteoblasts are the cells that actively synthesize and secrete the organic components of the bone matrix.

D. osteocytes: These are mature bone cells that reside within the matrix to maintain it, but they no longer actively secrete it.

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