In what way do the membranes of a eukaryotic cell vary?
A) Phospholipids are found only in certain membranes.
B) Certain proteins are unique to each membrane.
C) Only certain membranes of the cell are selectively permeable.
D) Only certain membranes are constructed from amphipathic molecules.
E) Some membranes have hydrophobic surfaces exposed to the cytoplasm, while others have hydrophilic surfaces facing the cytoplasm.
Answer: B
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According to the current model, which of the following is the correct sequence of microtubule assembly?
A) dimers, oligomers, sheets of protofilaments, protofilaments, closing of microtubule, elongating microtubule B) dimers, sheets of protofilaments, closing of microtubule, oligomers, protofilaments, elongating microtubule C) dimers, oligomers, protofilaments, sheets of protofilaments, closing of microtubule, elongating microtubule D) protofilaments, sheets of protofilaments, closing of microtubule, elongating microtubule, dimers, oligomers E) dimers, oligomers, protofilaments, elongating microtubule, sheets of protofilaments, closing of microtubule
The source of glucocorticoids is the
a. pituitary gland. b. adrenal cortex. c. adrenal medulla. d. thymus gland. e. thyroid gland.
________ wrap aroung neurons in the preiheral nervous system, covering them with layers of plasma membrane.
A. Schwann cells B. oligodendrocytes C. microglia D. astrocytes
Microbial biodegradation of wastewater occurs PRIMARILY during
a. primary treatment. b. secondary treatment. c. tertiary treatment. d. all stages of treatment.