A macrophage is also referred to as an antigen-presenting cell. explain why that is an appropriate term.

Which of the following is the conversion factor used to convert light-years to miles? A. 5.9 X 102 miles 1 light-year B. 1 light-year 5.9 trillion miles C. 1 light-year 5.9 million miles D. 1 light-year = 5.9 x 101 miles

What caused the fox population to go up?

How does the skin protect the body from dehydration?

8. The function of lipoproteins in blood serum is to: a. aid in blood clotting b. transport cholesterol c. maintain pH d. remove defective red blood cells

Name the group of animals whose ancestors were related to the earliest chordates

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?