TPA, or tissue plasminogen activator, is a compound sometimes given to a person suffering from a heart attack. Why would a compound that apparently activates plasminogen be useful in treating a heart attack?

What will be an ideal response?


Plasminogen is a protein that forms plasmin, a clot-dissolving enzyme that is naturally produced in the body. When blood clots inappropriately form, they can block blood flow to the heart, thus causing a heart attack. If the blood clots can be dissolved, then blood flow may be restored.

Biology & Microbiology

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Choose the direction in which phloem can transport materials

A. sink to source B. source to sink C. sink to sink D. source to source

Biology & Microbiology

The stalk-like support for a leaf is called a(n)

A. blade. B. node. C. internode. D. companion cell. E. petiole.

Biology & Microbiology

Liquids must absorb energy

What will be an ideal response?

Biology & Microbiology

The "X" shaped chromosomal hereditary material can be packaged in this organelle in eukaryotic cells but not in prokaryotic cells. This organelle is the:

A. nucleoid. B. chloroplast. C. ribosomes. D. nucleus. E. mitochondria.

Biology & Microbiology