Which step of binary fission is the reason for genetically identical daughter cells?
a. There are four new daughter cells that result from one parental cell
b. Elongation of the cell
c. Splitting of the two daughter cells
d. Replication of the bacterial chromosome
Answer: d. Replication of the bacterial chromosome
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There are several checkpoints in the mitotic cell cycle. All occur in the S phase
Indicate whether the statement is true or false
In the experiment in which Frye and Edidin fused the plasma membranes of a mouse and a human cell, what happened
to the membrane proteins? a. They formed a bilayer. b. They formed a spherical structure. c. They moved laterally across the cell surface. d. They flip-flopped from one layer to the other. e. They reacted with cholesterol molecules on the membrane surface.
A biologist isolates numerous tiny, green pigment cells from a sample of lake water. The cells are covered with a mucilaginous sheath. They contain relatively large amounts of chlorophyll a and phycobilin pigments and lack a compact, organized nucleus. Electron microscopy will reveal that these cells are also contain which of the following pairs of subcellular structures?
A. Ribosomes and chloroplasts B. Ribosomes and mitochondria C. Golgi bodies and a cell wall D. Thylakoids and a cell wall E. Chloroplasts and mitochondria
Convert 1mL to liter.
A. 0.01 liter B. 100 liters C. 10 liters D. .001 liters