In the absence of a nerve connection or electrical stimulation, can a muscle cell be made to contract in a laboratory
setting? Explain your answer. What will be an ideal response?
ANSWER: Yes. The key event in causing a muscle to contract is increasing the cytoplasmic calcium
levels, as calcium is responsible for removing the tropomyosin from the binding sites on the
actin. Thus, by injecting calcium into the cells they could be made to contract.
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During meiosis II in sperm development
A) primary spermatocytes divide meiotically to form diploid secondary spermatocytes. B) secondary spermatocytes divide meiotically to form haploid spermatids. C) spermatids divide meiotically to form haploid spermatozoa. D) sperm and oocyte meet and merge.
Ectomycorrhizae hyphae pass through the walls of the cells in the root cortex
a. True b. False
Fragmentation is a type of ____ for drift algae, like Sargassum
a. mechanism that leads to genetic population structure b. sexual reproduction c. asexual reproduction d. response to high water temperature e. response to herbivory
The probability that two random events will occur together is equal to the __________
a. sum of their individual probabilities b. difference between their individual probabilities c. product of their individual probabilities