Most of the carbon dioxide released from cells is transported in the blood as
A) carbohydrates, such as glucose. B) dissolved carbon monoxide.
C) bicarbonate ions in the plasma. D) carbon dioxide attached to hemoglobin.
C
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If humans reproduced by parthenogenesis,
a. males would need to produce more sperm. b. the number of males in the population would most likely increase. c. the number of females in the population would most likely increase. d. the children would be identical to their parents. e. there would be no need for mitosis.
In some plants, the direction of growth changes in
response to contact with an object. This is called __________. Fill in the blank(s) with the appropriate word(s).
The three steps, in order, of the Calvin Cycle are:
a) fixation of CO2, sugar creation, regeneration. b) sugar creation, regeneration, ATP production. c) ATP production, the electron transport chain, and fixation of NADPH. d) the splitting of water, the electron transport chain, the passing of electrons to NADP+. e) regeneration, fixation of NADP+, sugar creation.
Animals exploit the phospholipid asymmetry of their plasma membrane to distinguish between live cells and dead ones. When animal cells undergo a form of programmed cell death called apoptosis, phosphatidylserine—a phospholipid that is normally confined to the cytosolic monolayer of the plasma membrane—rapidly translocates to the extracellular, outer monolayer. The presence of phosphatidylserine on the cell surface serves as a signal that helps direct the rapid removal of the dead cell. How might a cell actively engineer this phospholipid redistribution?
A. by activating a scramblase and inactivating a flippase in the plasma membrane B. by inverting the existing plasma membrane C. by inactivating a scramblase in the plasma membrane D. by inactivating both a flippase and a scramblase in the plasma membrane E. by boosting the activity of a flippase in the plasma membrane