Viruses defy characterization as living organisms even though they possess nucleic acids and proteins. The reason why viruses are not considered to be alive is because they

A. form spontaneously.
B. cannot form spontaneously.
C. cannot reproduce without a host cell.
D. lack genetic material.


C

Biology & Microbiology

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Which of the following statements about sister chromatids is TRUE? rev:

A. Sister chromatids are produced during mitosis. B. Sister chromatids are held together by complementary base pairing of DNA at the centromere. C. Sister chromatids are exact copies of each other and are formed just prior to cell division. D. After mitosis, sister chromatids contain the same genes, but they may have different alleles. E. All of these statements about sister chromatids are TRUE.

Biology & Microbiology

The production of interferon will protect the host cell from a viral infection.

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

Biology & Microbiology

An individual who inherits three copies of chromosome 18 will develop ________ syndrome

Fill in the blank(s) with correct word

Biology & Microbiology

Which of the following is not a science? 

A. economics B. astronomy C. engineering D. biology

Biology & Microbiology