Proteins that distinguish among serovars of gram-negative bacteria are found in which structures?
a) Fimbriae
b) Pili
c) Flagella
d) Axial filaments
Ans: c) Flagella
You might also like to view...
Dopamine derived from the hypothalamus is the prominent hormone controlling pituitary prolactin secretion. Dopamine inhibits prolactin secretion. What do you predict would happen if the pituitary were removed from the base of the brain and transplanted to some distant place in the body (for instance on top of the kidney), such that dopamine could no longer regulate prolactin secretion? You can
assume that the transplanted pituitary will be exposed to a ready supply of blood vessels. A. Dopamine secretion would increase. B. Dopamine secretion would decrease. C. Prolactin secretion would decrease. D. Prolactin secretion would increase. E. Both dopamine and prolactin secretion would decrease.
Cations are
A. atoms that have gained electrons. B. charged subatomic particles. C. atoms without protons. D. atoms that have gained neutrons. E. capable of forming ionic bonds with anions.
When CpG islands are unmethylated, __________
A) chromatin in the promoter region is open, allowing access by transcription factors and RNA polymerase B) chromatin in the promoter region is closed, preventing transcription factors and RNA polymerase from binding C) chromatin in the enhancer region is closed, so they are unable to bind regulatory proteins to initiate transcription D) DNAse hypersensitivity in that region of the chromosome is lost E) genes downstream of the CpG islands cannot be expressed, because the promoter region is blocked by histones
Fungi are more closely related to:
A) photosynthetic protists. B) animals. C) archaea. D) plants.