Accessory organ infections are caused by

A) human herpesvirus 1.
B) norovirus.
C) mumps virus.
D) rotavirus.
E) enterovirus.


C

Biology & Microbiology

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Allolactose, an isomer of lactose, is formed in small amounts from lactose. An E. coli cell is presented for the first time with the sugar lactose (containing allolactose) as a potential food source. Which of the following occurs when lactose enters

the cell? A) The repressor protein attaches to the regulator. B) Allolactose binds to the repressor protein. C) Allolactose binds to the regulator gene. D) The repressor protein and allolactose bind to RNA polymerase. E) RNA polymerase attaches to the regulator.

Biology & Microbiology

In gene knockouts a normal gene is replaced with a defective gene that can't express a functional protein

1.True 2.False

Biology & Microbiology

How would the hydrolysis of phosphodiester bonds impede the origin of life?

A. It would stop the formation of cell membranes. B. It would prevent the assembly of nucleic acids. C. It would digest amino acids. D. It would slow the rate of protein synthesis.

Biology & Microbiology

Which of the following is the most common place to find DNA methylation?

A) on cytosines when adjacent to guanines B) on cytosines when adjacent to other cytosines C) on guanines when adjacent to cytosines D) on cytosines when they are base paired to guanines E) on guanines when adjacent to other guanines

Biology & Microbiology