Which of the following represents an abundant element found in living organisms?

A. calcium.
B. iron.
C. iodine.
D. hydrogen.
E. sodium.


D. hydrogen.

Biology & Microbiology

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A single atom of carbon may form up to

__________ covalent bonds with other atoms. a. 2 b. 3 c. 4 d. 5 e. 6

Biology & Microbiology

Which of these is an agent that is used to sterilize the plastic tubing of heart-lung machines?

A. Phenol B. Ethylene oxide C. Mercaptoethanol D. 70% ethanol

Biology & Microbiology

Insulin lowers blood sugar. If insulin levels are high shortly after a meal, we can conclude that insulin secretion is regulated by ________ feedback mechanisms

Fill in the blank(s) with correct word

Biology & Microbiology

Who challenged the case for spontaneous generation with the concept of biogenesis?

a) Pasteur b) Virchow c) Redi d) Needham

Biology & Microbiology