Answer the following statements true (T) or false (F)
1. Myofibrils are made up of groups of muscle fibers.
2. The development of large muscle fibers is referred to as atrophy.
3. Slow-twitch muscle fibers do not fatigue as rapidly as fast-twitch muscle fibers.
4. Power activities, such as sprinting, use predominantly fast-twitch muscle fibers.
5. A person recruits more motor units when picking up a small weight than when picking up a large weight.
1. False
2. False
3. True
4. True
5. False
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What is the fate of an immature B cell that encounters and has specificity for self antigen?
a. If further heavy-chain and light-chain gene rearrangements are possible, it undergoes apoptosis. b. Somatic hypermutation. c. Decrease in production of IgD. d. Continued rearrangement of heavy-chain genes. e. Continued rearrangement of light-chain genes.
What is the dilution of the fifth tube in a 2-fold serial dilution when the first tube's dilution is 1:10?
a. 1:40 b. 1:1000 c. 1:160 d. 1:80
If 40 of the 120 scores in a distribution fall below a score of 50, what is the percentile rank of this score?
What will be an ideal response?
Anthropologist Helen Fisher and other scientists have described attraction as
A) a peaceful feeling due to the release of oxytocin. B) the degree of commitment in a relationship. C) feelings of elation and euphoria produced by neurochemicals. D) emotional reactions triggered by past experiences.