How do calcium ions affect muscle contractions?
What will be an ideal response?
The tropomyosin-troponin complex situates itself at the actin-myosin binding sites, preventing the formation of the cross-bridges. The tropomyosin-troponin complex can be moved once calcium ions bind to the troponin, exposing the myosin heads to the actin filaments and allowing the contraction to proceed.
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Your instructor wants you to bring in an example of a biofilm to your lab. Which choice is the best selection for bringing in an intact biofilm for further study?
A. Disconnecting and bringing in the old, mildewed showerhead from the showers in your dorm B. Scraping the mold off of the shower curtain in your dorm's bathroom into a paper cup using a butter knife C. Using a toothpick to scrape plaque off of your teeth and smearing it onto a slide to bring in to lab D. Wiping a sponge across a slimy boulder in a stream in a nearby park and bringing it in to lab
Ascomycetes produce which of the following?
A) Chytrids B) Penicillin C) Smuts and rusts D) Basidia E) Black bread mold
Indicate the proper order of events that occur in fertilization.
What will be an ideal response?
Which item below is unique to eukaryotic cells?
A. Cell wall B. Plasma membrane C. Nucleoid D. Ribosomes E. Vacuole