The concept of homeostasis originated with:

A. Claude Bernard.
B. Charles Darwin.
C. James Watson.
D. Rosalind Franklin.
E. Gregor Mendel.


A. Claude Bernard.

Biology & Microbiology

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A ______ usually is the lymphoid tissue first to encounter pathogens and antigens that enter via the nose and mouth.

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An amino group is weakly basic and includes a(n) ____ atom covalently bonded to two hydrogen atoms

a. sulfur b. carbon c. oxygen d. nitrogen e. phosphate

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Upon closer inspection of the leaves of "flower of stone," one can observe tiny, cone-like structures. Each cone-like structure emits spores of two different sizes

Further investigation also reveals that the roots of "flower of stone" branch only at the growing tip of the root, forming a Y-shaped structure. Based on these additional observations, which of the following can be properly inferred about "flower of stone"? 1. It is heterosporous. 2. It is a fern. 3. The cone-like structures are sori. 4. It is a lycophyte. 5. It has separate male and female gametophytes. A) 1 and 5 B) 2 and 3 C) 1, 2, and 3 D) 1, 4, and 5

Biology & Microbiology

An acid is a substance that, in solution, releases 

A. oxygen ions in H2SO4. B. hydrogen ions, for example, HCl. C. —COOR ions from beer. D. chloride ions from NaCl.

Biology & Microbiology