What is peristalsis?
A. a process of fat emulsification in the small intestine
B. voluntary control of the rectal sphincters regulating defecation
C. the transport of nutrients to the liver through the hepatic portal vein
D. loss of appetite, fatigue, dehydration, and nervous disorders
E. smooth muscle contractions that move food through the alimentary canal
E. smooth muscle contractions that move food through the alimentary canal
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What does the presence of the Widmanstätten patterns in iron meteorites tell us about their history?
What will be an ideal response?
Which of the following is NOT classified as an ectoparasite?
a. aphids b. bedbugs c. leeches d. mosquitoes e. tapeworm
Caldarchaeol lipids are extremely thermostable tetraethers found in many ________.
A. hypersalinic archaea B. autotrophic archaea C. psychrophile archaea D. hyperthermophilic archaea
What is the fate of the prophage during the lysogenic stage?
a. It is released from the cell by lysing the cell. b. It is copied every time the host DNA replicates. c. It is packaged into viral proteins and maintained until the host is exposed to an environmental stress. d. It is degraded by the activity of host defense enzymes.