Question

question 13
1 pts
intracellular parasites that consist of dna or rna surrounded by a protein coat and sometimes by a lipoprotein envelope are called:
○ viruses.
○ bacteria.
○ fungi.
○ protozoa.

question 14
1 pts
shivering to try to raise your body temperature back to normal would be an example of:
○ the body trying to maintain homeostasis.
○ a positive - feedback mechanism.
○ a negative - feedback mechanism.
○ both a and c.

question 15
1 pts
of the 11 major body systems, which is the least involved in maintaining homeostasis?
○ circulatory
○ endocrine
○ lymphatic
○ reproductive

Explanation:

Question 13

Viruses are intracellular parasites with DNA or RNA, a protein coat (capsid), and sometimes a lipoprotein envelope. Bacteria are prokaryotic cells, fungi are eukaryotic with cell walls, and protozoa are single - celled eukaryotes. So the correct option is the one with "viruses".

Homeostasis is maintaining internal stability. Shivering raises body temperature to normal, which is homeostasis. Negative - feedback mechanisms reverse deviations from set points (like temperature), while positive - feedback amplifies changes. Shivering is negative feedback and for homeostasis, so both A and C are correct.

Circulatory (transports nutrients, gases), Endocrine (hormonal regulation), and Lymphatic (immune, fluid balance) are involved in homeostasis. Reproductive system's main role is reproduction, so it is least involved in homeostasis.

Answer:

A. viruses.

Question 14