In 1858, a German scientist named Rudolph Virchow stated that spontaneous generation of living things from nonliving matter was impossible. This statement contributed to the development of the cell theory. In effect, what was Virchow saying?
A) Cells exist in a wide variety of shapes and sizes.
B) All cells come from existing cells.
C) The cell is the basic unit of all organisms.
D) Cells are alive.
Ans: B) All cells come from existing cells.
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Amoebae move by crawling over a surface (cell crawling), which involves _____
A) growth of actin filaments to form bulges in the plasma membrane B) setting up microtubule extensions that vesicles can follow in the movement of cytoplasm C) reinforcing the pseudopod with intermediate filaments D) cytoplasmic streaming
Which type of eye can form an image?
A. eyecup B. compound eye C. single-lens eye D. compound eye and single-lens eye.
A young boy has DMD. What do you know about his parents?
a. Both of his parents are carriers of DMD. b. At least one of his parents is a carrier of DMD. c. His mother is a carrier of DMD. d. His father is a carrier of DMD.
Diatoms are single celled marine algae with walls composed of (chiton/cellulose/carbonate/silica)
What will be an ideal response?