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.
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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
The stalk-like support for a leaf is called a(n)
A. blade. B. node. C. internode. D. companion cell. E. petiole.
Liquids must absorb energy
What will be an ideal response?
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.