Mast cells are primarily responsible for constricting blood vessels at the site of an infection due to their secretion of which chemical messenger?

When a person is experiencing heartburn he or she feels a burning sensation in the throat and mid chest. What most likely causes the burning sensation

What do eukaryotes and archaea have in common that is lacking from bacteria? a. Unique membrane lipids in the cell membrane b. A membrane surrounding the genetic material c. Splicing machinery for introns d. The presence of ribosomes

Explain why human eggs all contain one X chromosome

Use the concept of a computer system to explain why it is difficult to determine clear distinct boundaries to a system. Include sample descriptions

What are the special organs that store leukocytes

What is the least common multiple for 8,27, and 35?

Students were tasked with developing a model of how pesticide resistance is developed in a population of farming pests. Each student submitted the scenario they would model to their teacher.

Which organs are responsible for producing fluid to give sperm nourishment and motility? a) vas deferens b) testes c) seminal vesicles d) prostate glands

Are genetic mutations bad

What is the taxonomy of each organism from largest to smallest grouping? List or organisms: brown bear, gold fish, honey bee, fruit fly.