Many bacteria facilitate the uptake of iron by secreting low molecular weight molecules, called ________, to form complexes with the iron that can then be readily transported into the cell.

Fill in the blank(s) with the appropriate word(s).


siderophores

Biology & Microbiology

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In female humans and other mammals, dosage compensation is achieved by the inactivation of one of the two X chromosomes in each cell. Which one of the following does not occur in the X-inactivation mechanism of female mammals?

A. X-inactivation begins with a small region of the X chromosome that contains a gene for an X-inactivation specific transcript (Xist). B. Xist is expressed in low levels except when an X chromosome is about to be inactivated. C. When an X chromosome is about to be inactivated, Xist RNA transcripts increase markedly and undergo splicing, but do not encode a protein. D. Xist RNA is attracted to and associates with a protein called the X-chromosome inactivation center (XIC), which becomes entirely coated with Xist. E. Xist RNA recruits factors that promote DNA methylation, histone modification, and other changes associated with transcriptional silencing.

Biology & Microbiology

The periodic table of the elements was devised by

a. Henri Becquerel. b. Demitri Mendeleev. c. Melvin Calvin. d. Marie Curie. e. Becquerel and Mendeleev.

Biology & Microbiology

High fever, headache, extreme fatigue, and a rash on the face that progresses to fluid- and pus-filled sores before crusting over and healing are signs and symptoms consistent with infection with

A. adenovirus. B. herpesvirus. C. papillomavirus. D. polyomavirus. E. poxvirus.

Biology & Microbiology

The gene responsible for the condition known as sickle-cell anemia demonstrates ________.

A) incomplete dominance B) a dominant genetic disorder C) a sex-linked genetic disorder D) a recessive genetic disorder

Biology & Microbiology