RNA interference (RNAi) can be used by
A) researchers to induce the production of more mRNA.
B) researchers to artificially turn on gene expression.
C) viruses to stop the production of new proteins.
D) cells to prevent infections from double-stranded RNA viruses.
Answer: D
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In order to infect a cell, a virus must
A. have a special protein on its surface that can interact with a protein receptor on the surface of the host cell. B. produce a special extension of its cytoplasm when it comes into contact with the appropriate host cell. C. inject its protein into the cell while the nucleic acid remains attached to the host cell surface. D. active burrow through the cell wall or cell membrane of the host cell to reach the cell's nucleus.
Intron self-splicing occurs when two ________ reactions excise the intron and allow exons to ligate
Fill in the blank(s) with correct word
The causative agent of trachoma is ________.
A. herpes simplex virus type 1 (HSV-1) B. C. trachomatis C. S. aureus D. N. gonorrhoeae E. adenovirus
In the black bread mold, zygospore production begins with development of hyphal branches whose cytoplasm is isolated from the rest of the mycelium by cross walls. These structures are known as
a. asci b. basidia c. gametangia d. conidia e. sporangia