There are an estimated ________ species of plants alive today.
A. 300,000
B. 1,000
C. 8,500
D. 15,000
Answer: A
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Intracellular structures surrounded by membranes, such as mitochondria and lysosomes, are referred to as ________
Fill in the blank(s) with correct word
In what tissues can adult stem cells be found?
A) Stem cells are found only in embryonic tissues. B) Adult stem cells can be found in bone marrow and the liver. C) Stem cells can be found in any tissue that reproduces. D) Adult stem cells are found in hair and fingernail tissues.
Cells that are programmed to die, shrivel and shrink in a process called
A. encoded death. B. necrosis. C. totipotency. D. induction. E. apoptosis.
A cell is exposed to a substance that prevents it from dividing. The cell becomes larger and larger. This situation
A) should present no problem to the cell, since it can continue to perform all other necessary functions. B) should present no problem to the cell, because the surface area of the cell will increase as the volume of the cell increases. C) will eventually be problematic, since the cell's ability to absorb nutrients through its outer membrane will not increase as quickly as its cytoplasmic needs. D) should be beneficial, since the cell will be able to divert the ATP normally used for cell division to other processes.