In skeletal muscle contraction, which of the following must be moved to the grooves in the actin
double helix to uncover the crossbridge binding site?
a. troponin
b. Ca2+
c. tropomyosin
d. ATP
e. acetylcholine
C
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Which of the following processes is not a part of metagenomic analysis of an environment?
A. Polymerase chain reaction B. Extraction of DNA from original sample C. DNA sequence assembly D. Reverse transcription E. High-throughput sequencing
Which are recycling centers for the cell?
A. ribosome and Golgi apparatus B. endoplasmic reticulum and chloroplast C. mitochondria and nucleus D. central vacuole and lysosome E. All of the answer choices are correct.
Most of the absorption of nutrients (besides water) takes place in the ________.
A. stomach B. small intestine C. esophagus D. large intestine
The diarrhea that is a symptom of diseases like cholera is due to problems in the function of the
A. stomach. B. small intestine. C. appendix. D. large intestine. E. gall bladder.