Which of the following statements regarding transcription only apply to eukaryotes and not to prokaryotes?
A. A single RNA polymerase transcribes genes that encode mRNAs, tRNAs, and rRNA.
B. Sigma (?) subunit detaches from RNA polymerase shortly after transcription has initiated.
C. The C-terminal domain of the polymerase is phosphorylated after transcription has initiated.
D. RNA synthesis is inhibited by actinomycin D.
E. RNA synthesis is inhibited by rifampicin.
C
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A mass of hyphae in an ascomycete is commonly referred to as a(n)
A. mycelium. B. mycorrhizae. C. conidium. D. sporangium. E. ascus.
Multiple sclerosis (MS) is a progressive inflammatory disease of the central nervous system characterized by intermittent damage to myelin (called demyelination) caused by the destruction of specialized cells (oligodendrocytes) that form the substance. Given what you know about the function of myelin, predict the consequences associated with its progressive loss.
_____ Sensory abnormalities (e.g., tingling, numbness, itching, tightness, burning, shooting pain) and motor coordination loss. _____ Racing heartbeat, hyperactivity and nausea. _____ Low levels of potassium in the blood (hypokalemia). _____ Balance and equilibrium abnormalities (e.g., dizziness, vertigo, uncoordinated movements, tremor).
Following a properly-performed Gram stain, gram-positive bacteria will appear as pink or red cells.
Answer the following statement true (T) or false (F)
A process in which the plasma membrane surrounds particles and brings them into the cell is called exocytosis
1.True 2.False