What is the function of gap junctions in cells?
a. Anchor the cells to basal lamina.
b. Hold the cell wall close to the plasma membrane.
c. Allow ions and small molecules to flow freely between cells of a given tissue type.
d. Serve as a scaffold for active transport proteins to cluster together.
e. Anchor the cells to neighboring cells.
ANSWER: c
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Water treatment processes for drinking water
A. are similar to wastewater treatment. B. are only necessary when using recycled water. C. includes disinfection but not filtration. D. has no biological treatment phase.
The Cambrian explosion refers to Earth's historical benchmark of life involving the
A. appearance of fossils for all major phyla of animals. B. origination of life, when the progenotes formed the first cells. C. All of the answer choices are correct. D. mass extinction of the nonavian dinosaurs. E. development of the first multicellular organisms.
What will happen by the end of the eighth week of development?
A. Limbs form, and paddles at their ends are sculpted into digits. B. The umbilical cord and the circulatory system develop. C. All of the organ systems will be formed, and apoptosis has eliminated the tail. D. The fetal heartbeat can be heard clearly through a stethoscope positioned on the mother’s abdomen. E. The fetus has begun not only to detect sounds but also to remember some of them.
In Bacillus subtilis, ________ controls expression of several sporulation genes; sporulation occurs when it is highly phosphorylated
a. CtrA b. Spo0A c. NtcA d. GFP