A double-stranded, enveloped DNA virus that contains reverse transcriptase belongs to which family?
A. Hepadnaviridae
B. Poxviridae
C. Picornaviridae
D. Retroviridae
E. Rhabdoviridae
Ans: A. Hepadnaviridae
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Capsules are particularly important for
A) making bacteria more vulnerable to host defense mechanisms. B) making bacteria less pathogenic. C) protecting bacteria from host defense mechanisms. D) allowing bacteria to become more phagocytic.
In the fall, leaves of most deciduous trees change color. This color change takes place when the chlorophyll in the cells breaks down and the other pigments become visible as the green color fades. What is the purpose of the other pigments within a plant cell?
A) The other pigments are waste products of cellular activities and are stored within the vacuoles of the cells. B) The other pigments assist in absorbing specific wavelengths of light for photosynthesis. C) The other pigments are used in the dark reaction of photosynthesis. D) The other pigments are for color only and assist in camouflage.
Which structures are restricted, causing an asthma attack?
a. Trachea b. Bronchioles c. Alveoli d. Capillaries
Which of the following cells would undergo osmotic lysis?
a. gram- cell in distilled water b. gram- cell in salt water c. gram+ cell in distilled water plus penicillin d. gram+ cell in salt water