Nearly half of the human genome is composed of a noncoding DNA that can move from one chromosomal location to another.  This type of noncoding DNA is/are called

A. introns.
B. pseudogenes.
C. microRNA genes.
D. transposons.
E. tandem clusters.


Answer: D

Biology & Microbiology

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Which of the following events takes place in the electron transport chain?

A) the breakdown of glucose into two pyruvate molecules B) the breakdown of an acetyl group to carbon dioxide C) the extraction of energy from high-energy electrons remaining from glycolysis and the citric acid cycle D) substrate-level phosphorylation

Biology & Microbiology

Which of the following eukaryotic organelles

are believed to have existed as independent prokaryotes in the past?

a. peroxisomes b. chloroplasts c. mitochondria d. lysosomes e. more than one of these

Biology & Microbiology

This cellular structure lacks a membrane:

endoplasmic reticulum chloroplast nucleus nucleoid Golgi body

Biology & Microbiology

)

A. These infections commonly occur in healthy individuals. B. E coli that causes UTIs is an example of a common opportunistic pathogen. C. Very young and very old patients are most susceptible to opportunistic infections. D. The presence of other pathogens in a patient has no effect on the development of opportunistic infections. E. Cancer patients are at a higher risk for opportunistic infections.

Biology & Microbiology