Control of transcription initiation of eukaryotic protein-coding genes involves
A) enhancers.
B) promoters.
C) repressors.
D) activators.
E) All of these
E
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Gram-positive bacteria produce endotoxins
Indicate whether the statement is true or false.
The largest fraction of saltwater is that which is frozen at the Earth's polar regions.
Answer the following statement true (T) or false (F)
Cilia and flagella of eukaryotic cells are composed of:
A. nine triplets of microtubules in a circle. B. actin filaments in a 9 + 2 arrangement. C. protein fibers in a helical arrangement. D. microtubules in a 9 + 2 arrangement.
During bacterial conjugation, bacterial DNA with different alleles get together. What is the name of the long tubular structure that bacteria use to obtain differing alleles?
a. the sex pilus b. the metabolic pilus c. the flagellum d. the asexual pilus