The first multicellular organisms probably arose about

A. 1.2 billion years ago.
B. 500 million years ago.
C. two billion years ago.
D. 3.5 billion years ago.
E. six billion years ago.


Answer: A. 1.2 billion years ago.

Biology & Microbiology

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Type I and Type 2 diabetes mellitus have different underlying causes. Type I diabetes is characterized by a loss of the insulin-producing cells of the pancreas, leading to insulin deficiency

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A mutation that changes a normal codon to a stop codon is called a ________ mutation.

A. missense B. silent C. point D. nonsense E. back

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Gated ion channels include each of the following except

A) voltage-gated channels. B) ligand-gated channels. C) mechanosensitive channels. D) patch clamp-gated channels. E) All of the above are types of gated channels.

Biology & Microbiology