The normal sex chromosomal combination for a human female is

A. XYY.
B. XY.
C. YY.
D. XX.
E. XXX.


D. XX.

Biology & Microbiology

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The majority of bacterial DNA is negatively super coiled

Indicate whether the statement is true or false

Biology & Microbiology

Cyanobacteria are so named because many species have a blue-green appearance caused by the photosynthetic pigment phycocyanin.

Answer the following statement true (T) or false (F)

Biology & Microbiology

In addition to being a group of gram-negative bacteria considered normal flora of the gastroin-testinal tract of humans and animals, which one of the following also contains agents of impor-tant diseases such as gastroenteritis and enteric fevers, urinary tract infections, and bacterial pneumonia?

a. Neisseriaceae b. Micrococcaceae c. Enterococcus d. Enterobacteriaceae

Biology & Microbiology

The active site of DNA polymerase is similar

a. in archaea and bacteria only b. in archaea, bacteria, and eukaryotes c. in archaea and eukaryotes only d. in none of these groups e. in bacteria and eukaryotes only

Biology & Microbiology