If a cell has the same concentration of dissolved molecules as its outside environment, the cell's condition is referred to as being
A. isotonic.
B. hypertonic.
C. hydrophilic.
D. hydrophobic.
E. hypotonic.
Answer: A
You might also like to view...
Phosphofructokinase is regulated by a number of factors, including high levels of ATP. Why is this enzyme regulated by ATP levels?
A. If ATP levels are high, this provides a mechanism to directly inhibit the Krebs cycle, thus preventing further generation of NADH, FADH2 and ATP molecules that are not needed. B. If ATP levels are high, it is important to directly inhibit the reaction that commits the substrate to glycolysis to allow the substrate to be available for other reactions, since the cell has ample energy. C. If ATP levels are high, it is important to inhibit ATP synthase, and phosphofructokinase directly inhibits ATP synthase. D. If ATP levels are high, this provides a mechanism to directly inhibit the electron transport chain, thus preventing the formation of a proton gradient in the intermembrane space of mitochondria.
The separation of genes during the formation of the sperm and egg and the reunion of genes at fertilization is explained by the behavior of chromosomes in a form of cell division called meiosis
a. True b. False Indicate whether the statement is true or false
. Which cell feature is absent in bacterial cells?
a. plasma membrane b. nucleoid c. cytoplasm d. nucleus e. DNA
A sudden loud sound such as an explosion is most likely to impair hearing by damaging which of the following?
a. hair cells in the organ of Corti b. the vestibular nerve c. the utricle and saccule d. the otoliths e. the endolymph