Membrane proteins are not very soluble in water, because they possess long stretches of non-polar amino acids that are
A. too long to interact with the water molecules.
B. hydrophobic.
C. are transmembranal.
D. hydrophilic.
E. used as transport channels.
B. hydrophobic.
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Many fully differentiated plant cells are totipotent, meaning that they
a. will grow roots if they touch the ground. b. will perform photosynthesis if exposed to sunlight. c. can fertilize an egg. d. have the potential to form a whole, fully-functional plant. e. can undergo meiosis.
Identify and briefly discuss two ecological roles filled by bacteria. What will be an ideal response?
Which of the following is a characteristic by which viruses are classified?
A) type of nucleic acid B) type of life cycle C) number of chromosomes D) type of host E) size
This opportunist is the most frequent cause of life-threatening pneumonia in AIDS patients.
A. Cryptococcus neoformans B. Malassezia furfur C. Candida albicans D. Pneumocystis jirovecii. E. None of the choices are correct.