What organism produces cysts that contaminate food and water and cause amebic dysentery?
a) Cyclospora cayetanensis
b) Giardia lamblia
c) Entamoeba histolytica
d) Aspergillus flavus
Ans: c) Entamoeba histolytica
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A twitch is contraction and relaxation of
A. one neuron. B. one muscle cell. C. an entire muscle. D. one sarcomere. E. several muscles.
Which of the following helps to create the electric gradient?
a. negatively charged proteins b. positively charged proteins c. neutral proteins d. cholesterol in the cell membrane e. hydrogen ions in the cytoplasm
Nutrients are often transformed and cycled by oxidation-reduction reactions that can change the chemical and physical characteristics of the nutrients.
Answer the following statement true (T) or false (F)
What level of structure in proteins is held together by intermolecular R group interactions?
A) quaternary structure B) secondary structure C) primary structure D) tertiary structure