Which ions are critical for the activation of some enzymes?
A) magnesium ions B) fluorine ions C) potassium ions D) chlorine ions
Answer: A
You might also like to view...
Which is not a membrane-bound organelle?
A. Ribosome B. Endoplasmic reticulum C. Peroxisome D. Golgi apparatus E. Lysosome
Placental functions are concentrated in a disc-shaped area in the endometrium called the
A) trophoblast. B) allantois. C) capsular decidua. D) basal decidua. E) parietal decidua.
The respiratory membrane is a combination of ________
A) respiratory bronchioles and alveolar ducts B) alveolar and capillary walls and their fused basement membranes C) respiratory bronchioles and alveolar sacs D) atria and alveolar sacs
Of the following muscles of the head, which one wraps around the mouth?
A) orbicularis oris B) nasalis C) frontalis D) zygomaticus major