Describe the differences between fast-twitch and slow-twitch muscle fibers
What will be an ideal response?
Slow-twitch muscles fibers do not contract as fast as fast-twitch muscles; they have a lot of mitochondria, high levels of myoglobin, and a plentiful blood supply. Fast-twitch fibers twitch faster and more strongly than slow-twitch muscle fibers; they have fewer mitochondria and a smaller blood supply.
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Mutations in which of the following genes lead to transformations in the identity of entire body parts?
A) morphogens B) segmentation genes C) egg-polarity genes D) homeotic genes E) inducers
Genes that code for transcription factors that bind regulatory sites on DNA are called
a. ideotic genes b. homeobox c. Hox genes d. homeotic genes e. homeodomains
What types of DNA damage will trigger DNA repair?
What will be an ideal response?
Which of the following is a natural pain reliever?
A) Acetylcholine B) Dopamine C) Endorphins D) Substance P E) Epinephrine