When is energy needed to move substances across the cell membrane

Why do cells go through Mitosis?

Humans have overpopulated Earth. Which is TRUE about the effect this has on another population? A. The size of the sea turtle population has increased. B. The size of the Florida panther population has decreased. C.

To be useful, a scientific hypothesis must: Select one: a. be true. b. be testable. c. be very specific. d. apply in all situations.

What tells the body how much sugar should be in the blood? a. thyroid gland b. pancreas c. pituitary gland d. endorphins

What is the function of horizontal cells in the eye? launchpad?

In a plants stem the vascular tissue is A. is always arranged in rings of vascular bundles B. is continuous from the roots to thel leaves C. carriers nutrients up the stem but not down D. plays a role in photosynthesis and storage.

During which stage of sex cell formation does the number of chromosomes decrease from diploid (2n) to haploid (n) ? a. prophase 1 b. prophase 2 c anaphase 1 d. anaphase 2

What would most likely interest an environmental scientist

Do you believe you have a personal responsibility to protect the environment

What happens to the total charge of the compound after the ions bond together?