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
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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.
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.
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.
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