Which organelle can be compared to a security guard who decides whom may enter a building and whom may not?

A: cell membrane

B: cytoplasm

C: endoplasmic reticulum

D: mitochondrion

Which intercellular communication type changes membrane permeability? A. Transmembrane Receptor B. Molecular Receptor C. Enzyme-linked Receptor D. Ion Channel-linked Receptor

What are the advantages and disadvantages of building new hydroelectric dams?

Why does ice float on water? a. The temperature of ice is lower than the temperature of water. b. The temperature of water and ice are the same. c. The density of ice is less than the density of water. d.

You are dispatched to a priority assignment involving a motor vehicle collision. once at the scene, you find one patient and determined that she is stable. this condition is no longer a:

The reactants in aerobic cellular respiration are glucose and oxygen glucose and carbon dioxide water and oxygen water and carbon dioxide

Early microbial ecologists knew that hydrogen gas is oxidized in soil and that ammonia is oxidized in sewage. How did these scientists determine that microbes are responsible for these ecological reactions? Choose one: A.

If more genes for less arm hair are passed on more frequently after several generations will people have more or less arm hair?

What kind of tissue is the precursor of long bones in the fetal skeleton?

Why are old rocks rare on the ocean floor

What is a storage form of carbohydrate energy?