1. Which of the following describes an endocytosis? There may bemore than one answer.

Select one or more:

a. A cell engulfs a bacterium by pushing its cell membranearound the bacterium forming a phagosome that will pinched off fromthe cell membrane and enter the cytoplasm.

b. Specific solutes accumulate along an indented cell membranethat will form into an endosome and it will pinch off from the cellmembrane and enter the cytoplasm.

c. A process that transports molecules outside the cell viafusion of a vesicle with the plasma membrane.

d. A pinocytosis is an uptake of a non-selective materials, likethe extracellular fluid, into a cell via endosome that pinches offfrom the plasma membrane into the intracellular fluid.

e. The process is initiated when an influx of Ca²⁺interacts with rabs and snares in the intracellular fluid.

2.

What are the characteristics of the red blood cells (RBCs)?There may be more than one answer.

Select one or more:

a. RBCs are circular, flattened, and biconcave cells whichtransport oxygen from the tissues to the lungs and carbon dioxidefrom the lungs to the tissues.

b. RBCs lacked nucleus and organelles but contained glycolyticenzymes, carbonic anhydrase, and hemoglobin.

c. RBCs, leukocytes, and platelets are derived from uncommittedpluripotent hematopoietic stem cells.

d. Erythropoiesis in adult occurs in the liver, spleen, and allred bone marrow.

e. RBCs live for about 9 days.