Cells that are the main water-conducting cells of a

plant are
a. sclereids.
b. tracheids.
c. sieve tubes.
d. parenchyma.
e. all of these.


Answer: b

Biology & Microbiology

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The functional unit of a muscle cell is:

A. a muscle fiber B. the sarcomere C. myosin D. actin

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Which of the following characteristics of transcription initiation by ?70-containing polymerase holoenzymes is different than for ?54-containing polymerase holoenzymes?

A. The holoenzyme binds to its promoter to initially form a closed complex. B. The formation of the closed complex is readily reversible. C. The closed complex spontaneously converts to the open complex. D. The opening of the DNA duplex is accompanied by energetically favorable conformational changes in the holoenzyme. E. Initiation is primer-independent.

Biology & Microbiology

Ultraviolet radiation is an effective means of sterilizing surfaces.

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

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A(n) ________ is a group of cells of similar type that work together to serve a common function

Fill in the blank(s) with correct word

Biology & Microbiology