What is the substance the influences a reaction but doesn't become a part of it

What is the role of pollen grains in fertilization process?

How has technology broadened our understanding of microorganisms?

Sickle cell anemia is known to run in a family. A pedigree chart for this family is shown below. The parents are shown at the top and from left to right appear as a half-shaded circle next to a half shaded square.

Semisolid media such as MIO are used to determine motility. Another such medium such is SIM (sulfide, indole, motility) medium. When would you use SIM instead of MIO?

An amniocentesis or amniotic fluid test has identified a defect on the short arm of the 21st pair of chromosomes in a developing embryo. it is likely that this child will have

Gee's arm was cut during an industrial accident. the blood was pouring from the wound in spurts. which type of vessel was severed?

Why does Betelgeuse have a much greater absolute magnitude than apparent magnitude?

The cell's nucleus is filled with a substance called protein.

How are genes related to chromosomes?

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