South america obtains most of its caffeine from the seeds of this plant

What is a possible cause of solar prominences

Stellar equilibrium is a balance between what two things? A. Outward and inward gravity. B. Outward pressure from light and inward pressure from heat. C. Outward pressure from hydrogen and inward helium. D. Outward pressure and inward gravity

What species is on top of the food chain eagle, mountain, or a mouse

Which of the following drugs is most likely to cause psychosis, where a person starts becoming delusional (i. e., having false beliefs), and becomes paranoid?1. Amphetamines 2. Nicotine3. Barbiturates4. Alcohol5. Caffeine

A plant cell differs from an animal cell in that the annual cell does not have?

In what way do kinetochore microtubules facilitate the process of splitting the centromeres? they phosphorylate the centromere, thereby changing its conformation. they slide past each other like actin microfilaments.

Examples of analogous structures are a. the tails of mice and rats. b. the limbs of humans and apes. c. the wings of bats and birds. d. all of the above

Binding of a signaling molecule to which type of receptor leads directly to a change in the distribution of ions on opposite sides of the membrane? a. intracellular receptor b. G protein-coupled receptor c.

Which star has a lower temperature then our sun but is more luminous

Assuming that an ER signal peptide forms an alpha helix, is that helix likely to be amphipathic? Why or why not?