Although heavy metals are no longer widely used as germicides, ________ is an effective algicide in lakes and swimming pools.

A. lead acetate
B. silver nitrate
C. mercuric chloride
D. copper sulfate


Answer: D

Biology & Microbiology

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The early cell divisions of human development differ from other mitotic cell divisions in that:

A. cells do not replicate all chromosomes prior to dividing; this helps the cells differentiate. B. cells do not grow in size; they subdivide the cytoplasm of the fertilized egg. C. cells move as they divide. D. they are unequal; some daughter cells are much larger than others. E. All of these choices are correct.

Biology & Microbiology

Metabolic pathways are designed to synthesize necessary cellular reagents as required for cellular and tissue function. To accomplish this, the reaction sequence _______.

a) does not include reactions for which the reverse reaction is significant b) includes both reactions that are essentially irreversible and reactions that are freely reversible (near equilibrium). c) utilized only chemical reactions that are energetically favorable (delta G is negative) under the conditions when synthesis is occurring. d) does not include reactions that are near equilibrium

Biology & Microbiology

Inversions are movements of DNA from one chromosome to another

Indicate whether the statement is true or false

Biology & Microbiology

All flatworms use their skin as a respiratory organ

Indicate whether the statement is true or false

Biology & Microbiology