The site of translation in all living cells is the ribosome, which is
a. made of large and small subunits in both prokaryotes and eukaryotes.
b. made of large and small subunits in eukaryotes, but is a single unit in prokaryotes.
c. a single unit in both prokaryotes and eukaryotes.
d. made of large and small subunits in prokaryotes but is a single unit in eukaryotes.
e. larger in prokaryotes than eukaryotes
A
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In the 1950s, Earl Sutherland and colleagues discovered that epinephrine ____
a. triggers the release of a second messenger which leads to the hydrolysis of glycogen to glucose b. triggers the release of a second messenger which lowers blood glucose by causing it to bind to liver cells c. interacts directly with the enzyme glycogen phosphorylase d. interacts directly with the cell membrane to help transport glucose into the cell e. is a signaling molecule that does not require a cell surface receptor
Which of the following best describes the overall goal of transcription?
A. To create a mRNA copy of a segment of DNA to take outside the nucleus. B. To retrieve amino acids and bring them to the ribosome for assembly into a polypeptide. C. To edit the mRNA strand and make it ready to leave the nucleus. D. To unpackage and unwind DNA so that enzymes can access the individual genes.
In Figure 16.1, how many mL is the inspiratory reserve volume?
A) 1700 B) 2200 C) 1300 D) 600 E) 2800
Which stimuli most directly causes the Venus flytrap to catch an insect?
a. gravity b. light c. touch d. scent e. sound