Fast-twitch muscle fibers, such as those that predominate in the legs of sprinters, ________ than slow-twitch fibers, which predominate in the legs of marathon runners
A) have a greater blood supply B) contain higher levels of myoglobin
C) contain fewer mitochondria D) produce more ATP
C
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The white, sticky, toxic liquid that runs through some plant veins and is particularly common in plants of the milkweed family is called ___________
A. filament B. nectar C. alkaloid D. latex E. tannin
Describe the similarities and differences between sperm and ova.
What will be an ideal response?
Heterotrophs that obtain energy and carbon by feeding on both animal and plant materials are called ____
a. detritivores b. herbivores c. carnivores d. omnivores e. decomposers
Which of the following sequences is incorrect?
a. Males: inhibin: secreted by Sertoli cells
b. Males: follicle-stimulating hormone: stimulate production of androgen binding protein c. Males: gonadotropin-releasing hormone: stimulate testosterone production d. Females: luteinizing hormone: stimulate ovulation e. Females: inhibin: decreased secretion of FSH