Which of the following statements concerning glial cells is true?
a. Astrocytes are phagocytic cells that remove debris in the central nervous system.
b. Schwann cells form sheaths around neurons within the central nervous system.
c. Oligodendrocytes regulate the concentration of neurotransmitters in neurons.
d. Microglia are involved in the neurological disease multiple sclerosis.
e. Ependymal cells help produce and circulate cerebrospinal fluid.
E
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The element needed for blood clotting, nerve
transmission, and bone formation is a. iron. b. iodine. c. calcium. d. zinc. e. magnesium.
Four of the five organelles listed below are part of the endomembrane system. Select the exception
a. smooth ER b. peroxisomes c. Golgi bodies d. vesicles e. mitochondria
A researcher wants to create a mouse model for a disease, to allow her team to study possible therapies. The disease is known to be caused by a small deletion that removes a certain gene. Which type of mouse would be the best choice for this purpose?
A. Knockout mouse B. Knockin mouse C. Conditional knockout mouse activated by a drug D. Mutant derived by traditional forward genetics screen E. Tissue-specific gene knockout Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? Gather Content · What do you already know about transgenic mouse technology? Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
The FtsZ gene in bacteria encodes an ancestral tubulin that is important in binary fission (the mechanism of cell division in prokaryotes). To study the FtsZ gene in eukaryotes, researchers made an FtsZ knockout in the moss What is true about this knockout plant?
A. The knockout plant is heterozygous for an abnormal FtsZ gene. B. The knockout plant does not produce any normal FtsZ protein. C. The knockout plant contains a copy of the bacterial FtsZ gene. D. The knockout plant makes bacterial FtsZ protein. E. The knockout plant makes half the normal amount of FtsZ protein.