The presence or absence of an envelope is not useful in classifying viruses because any given virus may at one time have an envelope and at another time not have an envelope.

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


False

Biology & Microbiology

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Which tissue type produces melanin?

A. epithelial B. connective C. muscle D. nervous E. endocrine

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Contraction of the diaphragm ____

a. diminishes the volume of the thoracic cavity b. increases the volume of the thoracic cavity c. pushes the rib cage downward d. causes external intercostal muscles to relax e. decreases lung capacity

Biology & Microbiology

Which organism's life depends on photosynthesis?

A. corals B. oak trees C. humans D. sea slug Elysia chlorotica E. All answers are correct.

Biology & Microbiology

Explain the significance of endospores.

What will be an ideal response?

Biology & Microbiology