What structure does blood pass through from the right atrium to the right ventricle?
a. bicuspid valve
b. inferior vena cava
c. tricuspid valve
d. semilunar valve
c. tricuspid valve
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Which of the following would NOT be considered a cell-surface receptor?
A. a receptor that binds a nonpolar steroid hormone and activates transcription B. a receptor that allows ions to enter the cell when a ligand binds C. a receptor that causes GDP to be exchanged for GTP in a G protein D. a receptor that must form a dimer after binding the ligand to transmit a signal
What is it called when alleles are randomly lost from a population?
a. mutation b. gene flow c. genetic drift d. nonrandom mating
A transmembrane protein has 1000 amino acids. The fifth amino acid is found on the external surface of the cell membrane. It interacts with the aqueous environment outside the cell
Amino acids 25 and 205 are covalently bonded to each other and are required to give the protein its three-dimensional shape. Amino acid 554 is found on the outer surface of the protein, but it is deep in the interior of the membrane. Amino acid 979 is found on the external surface of the protein, where it forms a weak ionic bond with a chloride ion. Can you identify each of the numbered amino acids by structural group and name? Please note that there may be more than one specific amino acid possible in some cases. Amino acids: 5 25 205 554 979 What will be an ideal response?
Carbon is such an important element for life because it:
A) does not form isomers. B) forms strong ionic bonds. C) is part of the water molecule. D) can form chemical bonds with a maximum of four other atoms. E) can hydrogen bond to many different molecules.