Which of the following is NOT a checkpoint that controls the progression of the cell cycle?
A. The metaphase checkpoint determines if all chromosomes are attached to the spindle apparatus.
B. The restriction point determines if conditions are favorable for cell division and if the DNA is undamaged.
C. The G2 checkpoint checks for DNA damage and determines if all of the DNA is replicated.
D. Cyclins and cyclin-dependent kinases are proteins that are responsible for advancing a cell through the phases of the cell cycle.
E. Cytokinesis involves the formation of cleavage furrow to separate the cells.
Answer: E
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This portion of the graph shows the activation energy when there is no enzyme
a. A b. B c. C d. W + X e. Y + Z
In eukaryotic cells, we sometimes find reverse transcriptase activity, even though the cells are not infected with a retrovirus. This activity can be attributed to
A) the presence of transposons integrating into polymerase genes. B) the presence of viroids. C) the presence of retrotransposons. D) infection with small bacteria known as mycoplasmas. E) a novel prion infection.
Who developed a method using a series of dyes to view and differentiate groups of bacterial cells?
Louis Pasteur Hans Christian Gram Robert Koch John Snow
Which of the following is not a source of ATP for muscle contraction?
A. aerobic respiration B. ATP in the blood C. ATP produced in the cell D. fermentation E. the creatine phosphate pathway