Question

1. which are examples of active transport across the cell membrane?

a. osmosis and diffusion
b. diffusion and facilitated diffusion
c. osmosis and chemiosmosis
d. endocytosis and exocytosis

1. wes places red blood cells in a petri dish with pure water and observes them under a microscope. he drew a model to illustrate his observations.

what is the most likely explanation for wess observations?
a. the red blood cells were placed into an isotonic solution. water moved into and out of the cells to maintain homeostasis.
b. the red blood cells were placed into an isotonic solution. water moved into the cells until the cells burst.
c. the red blood cells were placed in a hypertonic solution. water moved from the inside of the cells to the outside of the cells to maintain homeostasis.
d. the red blood cells were placed in a hypotonic solution. water moved from the outside of the cells to the inside of the cells until the cells burst.

Explanation:

Pregunta 2

La osmosis, la difusión y la difusión facilitada son procesos de transporte pasivo. La endocitosis y la exocitosis requieren energía (son procesos activos) para el transporte a través de la membrana celular.

Un medio hipotónico tiene una concentración de solutos menor que el interior de la célula. En este caso, el agua (que se mueve hacia la región de mayor concentración de solutos, es decir, hacia dentro de la célula) entrará en las glóbulas rojas hasta que éstas reventen. Un medio isotónico no provocaría cambios netos en el volumen de las células, y un medio hipertónico haría que el agua salga de las células.

Answer:

d. endocytosis and exocytosis

Pregunta 3