What method is often used by cells to move large solid material into the cell?
a. facilitated diffusion
b. exocytosis
c. simple diffusion
d. active transport
e. phagocytosis
E
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In angiosperms, meiosis of cells in the ovule give rise to haploid megaspores. What happens next?
a. Mitosis gives rise to a seed. b. Mitosis gives rise to an egg, a cell with two nuclei. c. Mitosis gives rise to a sporophyte. d. Meiosis gives rise to a dipold egg and a cell with two nuclei. e. Meiosis gives rise to a more megaspores.
A phenomenon in which sensations become less noticeable with prolonged exposure is called
A. gradient adaptation. B. an action potential. C. a graded potential. D. radiating adaptation. E. sensory adaptation.
White blood cells (WBCs) are more resistant to lysis than red blood cells (RBCs). When looking at a sample of blood for WBCs, what could you do to reduce interference from RBCs?
A) Mix the blood in a salty solution to cause the RBCs to lyse.
B) Mix the blood in an isotonic solution and allow the WBCs to float to the top.
C) Mix the blood in a hypotonic solution, which will cause the RBCs to lyse.
D) Mix the blood in a hypertonic solution, which will cause the RBCs to lyse.
Each angiosperm pollen grain contains how many sperm cells?
a. millions b. four c. one d. hundreds e. two