__________ moves food down the esophagus and
through a __________ (a ring of muscle that can
close off an opening) into the stomach. Fill in the blank(s) with the appropriate word(s).
Answer: Peristalsis; sphincter
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In a set of classic experiments performed in the early 1950s, Urey and Miller subjected an experimental system composed of H2, CH4 (methane), and NH4 (ammonia) to electrical sparks. A few days later, they found ________________ in their system.
a. cells b. rRNA c. DNA d. tRNA e. amino acids
Which of the following statements explains how N-formylmethionine (fMet) is incorporated only in response to the 5'-AUG initiation codon in E. coli, given that methionine has only one codon?
A. There is only one tRNA with the CAU anticodon. B. Only Met-tRNAmet can bind to a specific ribosomal entry site. C. The N-formyl group on methionine prevents fMet from entering interior positions in a polypeptide. D. fMet is always incorporated at interior AUG sites and then deformylated after translation.
A sheath of connective tissue that encloses each skeletal muscles is known as _____
a. cartilage b. a ligament c. a sphincter d. a joint e. a tendon
Which of the following would have the most surface area assuming the same volume?
A) a golf ball B) a perfect sphere C) a cube D) a tube