Imagine that you have been miniaturized and are riding through the circulatory system using a red blood cell as a life raft. You are nearly deafened by the first heart sound, which is caused by __________.

Fill in the blank(s) with the appropriate word(s).


Ans: the closing of the atrioventricular valves

Biology & Microbiology

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Which of the following terms describes gene regulation that occurs by rendering a protein non-functional?

a. epigenetic level of regulation b. post-transcriptional level of regulation c. translational level of regulation d. post-translational level of regulation

Biology & Microbiology

Modern cladists feel which of these organisms is different enough from the others that they should be placed in a different group?

A. snake B. lizards C. crocodiles D. all of the choices should be placed in the same group or taxon.

Biology & Microbiology

How is the leucine zipper formed, and what is its function?

What will be an ideal response?

Biology & Microbiology

Clades are equivalent to taxonomic rankings

1.True 2.False

Biology & Microbiology