Which of the following is characteristic of slow-twitch fibers but not fast-twitch fibers?
A. Force
B. Twitch
C. Motor Unit
D. Latent Period
E. Summation
Answer: B. Twitch
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Wikelski and Romero (2003) found that large marine iguanas had higher reproductive success than smaller iguanas did. However, the large iguanas were generally in poor body condition because they could not eat enough; at higher temperatures their foraging efficiency improved, allowing them to eat more. Thus, Wikelski and Romero hypothesized that iguana size will _____ as global warming gradually increases air and water temperatures in the Galápagos Islands.
A) increase B) decrease C) stabilize around the mean body size D) remain unchanged, it is not clear that body size increases fitness
The directional growth response of plants to touch is called
A. phototropism. B. gravitropism. C. thigmotropism. D. photoperiodism. E. thermotropism.
Which early scientist proposed that cells arise only from preexisting cells by a process of division?
a. Anton van Leeuwenhoek b. Robert Brown c. Matthias Schleiden d. Theodor Schwann e. Rudolf Virchow
The unicellular alga Chlamydomonas
a. lacks an asexual stage. b. lacks a sexual stage. c. lacks a haploid and a diploid phase. d. possesses both a haploid and a diploid phase. e. produces thick-walled resistant spores.