2points
what must occur for a message to be sent from the outside of the cell to
inside the cell?

a. a small, nonpolar molecule crosses the membrane.

b. enzymes inside the cell catalyze a reaction.

c. a signaling molecule binds with a membrane protein.

d. transport proteins form a channel for a large molecule.

What is the difference between an igneous, sedimentary and metamorphic rock

Plz ! a frog has a genetic mutation in skin cells that causes part of its skin to turn orange the frog will not pass this genetic mutation onto its offspring because, a. the offspring will inherit skin cells from the other parent. b. mutated skin cells cannot divide and produce daughter skin cells. c. skin cells do not contribute genetic material to sex cells. d. parents do not contribute genetic material to their offspring.

The wings of insects, birds, and bats evolved independently but carry out similar functions. this is an example of a. analogous structures. b. embryonic structures. c. vestigial structures. d. homologous structures.