An individual's ability to excel in certain types of sports may be due to different muscle fiber types
Certain muscle types allow some people, like marathoners, to have the ability to be
involved in sports which require sustained activity of their muscles, while other muscle types,
like in sprinters, allow people to excel in sports which require a rapid burst of muscle activity
but fatigue quickly. The sustained activity of muscles in marathon runners is due to the higher
yield of ATP per glucose. What differences would you predict for marathoners' muscles
compared to sprinters'?
What will be an ideal response?
Marathoners' muscles rely more on oxidative phosphorylation.
Marathoners' muscles require greater oxygen delivery to the muscle cells.
Marathoners' muscles have a greater number of mitochondria.
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Scientists have found that the lifetimes of mRNAs coding for pair-rule regulatory elements in Drosophila embryos may last only a few minutes. What does this suggest about the overall developmental plan of an animal body?
A) The role of mRNAs is less important than the position of genes in chromosomes. B) Homeotic genes have greater impact in forming an embryo than mRNA from pair-rule genes. C) Building an animal body requires a sequence of precisely timed steps. D) Timing of pair-rule sequence determination is not as important as spatial signaling.
Which of the following is true?
a. No species of slime mold form colonies. b. All species of slime mold form colonies. c. Slime molds form colonies only for reproduction. d. Some species of slime molds form colonies.
The sex chromosome in humans that make an individual a male are __________.
A. a and b B. X and X C. A and B D. X and Y
The degree to which a microbe is able to cause disease is known as its (morbidity/virulence/toxicity).
Fill in the blank(s) with the appropriate word(s).