During the process of muscle contraction, Ca2+ binds tropomyosin
____________________ Indicate whether the statement is true or false.
F, troponin
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The connection between stem cells and cancer is that
A) all stem cells are also cancer cells. B) cells may become cancerous by expressing "stemness" genes. C) stem cells rescue cells that have become cancerous. D) both stem cells and cancer cells have inactivated telomerase.
Mitochondria likely arose from _________ and chloroplasts likely arose from _________
Fill in the blank(s) with correct word
Denaturation disrupts the secondary and tertiary structure of proteins. However, denaturation is not strong enough to disrupt what interaction that is relevant to protein structure?
A. van der Waals attraction B. hydrophobic exclusion C. hydrogen bonds D. peptide bonds E. ionic bonds
The primary portal of entry for fungal infections is
A) Digestive system B) Nervous system C) Respiratory tract D) Through skin E) Urinary tract