Several of the structures in the muscle cell are given special names. For example, the cytoplasm of a muscle fiber is called the sarcoplasm. Which of the following is truly a unique structure to muscle cells (not just a renamed one)? 

A. endoplasmic reticulum
B. plasma membrane
C. transverse (T) system
D. cytoplasm
E. nucleus


Answer: C

Biology & Microbiology

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Sexual reproduction:

A. results in offspring that are not genetically identical. B. results from combining genetic material from two gametes. C. results in a new generation that is not genetically identical to its parents. D. results in a new generation with the same number of chromosomes as the parents. E. All of these choices are correct.

Biology & Microbiology

The effect of red light on plants is to:

a. inactivate phytochrome. b. convert Pfr to Pr. c. inhibit germination in some seeds. d. initiate shade avoidance responses. e. impact processes in plants that use phytochrome to detect day length.

Biology & Microbiology

A cross between a male horse and a female donkey produces a mule. Mules are an example of

A. hybrid infertility. B. gametic isolation. C. zygote mortality. D. temporal isolation.

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Which pair includes a phase of the cell cycle and a cellular process that occurs during that phase?

A) G1 phase, DNA replication B) G2 phase, preparation for mitosis C) S phase, cell division D) M phase, cell growth

Biology & Microbiology