Porin proteins form large, barrel-like channels in the membrane. Which of the following is not true about these channels?
(a) They are made primarily of ? helices.
(b) They are made primarily of ? sheets.
(c) They cannot form narrow channels.
(d) They have alternating hydrophobic and hydrophilic amino acids.
(a)
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The e4 variation of the APOE gene increases a
person’s chances of developing
a. cystic fibrosis. b. Parkinson’s disease. c. Huntington’s disease. d. Alzheimer’s disease. e. Duchenne’s muscular dystrophy
Capping the ends of chromosomes are stretches of DNA called
a. centromeres. b. centrosomes. c. acrosomes. d. telomeres. e. isomers.
Plankton consists mainly of microscopic organisms that float in the water
____________________ Indicate whether the statement is true or false.
In the diagram below, what type of control, positive or negative, is operating?
What will be an ideal response?