Which of the following levels of organization is least complex?

a) organ
b) tissues
c) organ system
d) cells


Ans: d) cells

Biology & Microbiology

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Explain how diet plays a role in host susceptibility to infection

What will be an ideal response?

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What word below is used to describe extracellular messenger molecules that bind to receptors at the extracellular surface of the responding cell?

a) bindand b) receptand c) ligand d) binder

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________ digestion is the process by which food particles are exposed to enzymes that break them down into smaller subunits

Fill in the blank(s) with correct word

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Suppose scientists discovered an organism that had a head with a brain at the anterior end of the dorsal nerve, eyes and other sensory organs, a skull, and a vertebral column. The organism could not be a/an

A) lamprey.
B) hagfish.
C) ray-finned shark.
D) amphibian.

Biology & Microbiology