Which of the following is an active enzyme?

A) apoenzyme
B) cofactor
C) coenzyme
D) holoenzyme
E) subtrate


D

Biology & Microbiology

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Most atmospheric oxygen comes from photosynthesis. From which of the following molecules is the oxygen derived?  

A.  water B.  carbon dioxide C.  glucose D.  chlorophyll a E.  chlorophyll b

Biology & Microbiology

Free fetal DNA (ffDNA) originates from the breakdown of fetal cells and their nuclei in the ____________________

Fill in the blank(s) with correct word

Biology & Microbiology

A person's spleen may be removed (splenectomy) if it becomes enlarged due to certain types of cancer, traumatic injury, or damage. What part of the immune system will be most affected by a splenectomy?

A) internal innate immunity B) external innate immunity C) adaptive immunity D) lymphatic system

Biology & Microbiology

A membranous sac that contains interacting organic molecules, hypothesized to have formed prior to the earliest life-forms:

A. protocell. B. archaea. C. ribozyme. D. chemotroph. E. protist.

Biology & Microbiology