Which of the following statements is NOT true about sister chromatids?
A. They are identical DNA sequences.
B. They are attached to each other at a
region of their DNA sequence called the
centromere.
C. They are formed in the S phase of the cell
cycle when the chromosome undergoes
replication.
D. They are formed when the prokaryotic
circular chromosome attaches at the plasma
membrane.
E. All of these statements about sister
chromatids are false.
D
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Electron flow through the transport chains causes hydrogen ions to be pumped from:
a. the matrix to the intermembrane space b. the cytoplasm to the intermembrane space c. the intracellular fluid to the cytoplasm d. cytoplasm to the mitochondria e. the intermembrane space to the matrix
The production of cyclic AMP in Dictyostelium results in
a. sexual reproduction. b. cell division. c. swimming. d. spore production. e. aggregation of cells.
Which theory of water transport states that hydrogen bonding allows water molecules to maintain a continuous fluid
column as water is pulled from roots to leaves? a. pressure flow b. evaporation-condensation c. cohesion-tension d. osmotic pressure e. bulk flow
The effect of smoking on the respiratory tract includes
a. reduced production of mucus. b. increased development of cells. c. immobilization of ciliated cells. d. destruction of white blood cells that patrol the respiratory tract. e. both immobilization of ciliated cells and destruction of white blood cells that patrol the respiratory tract.