Which of the following statements about the cytoskeleton is false?
A) The cytoskeleton helps to support cells.
B) Once laid down, the elements of the cytoskeleton are fixed and remain permanently in place.
C) The cytoskeleton is composed of three types of fibers: microfilaments, microtubules, and intermediate filaments.
D) The cytoskeleton plays an important role in amoeboid motion.
Answer: B
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What is the approximate size of the human population today?
A. 7 billion people B. 2 billion people C. 5 billion people D. 10 billion people E. 25 billion people
Choose the statement that correctly characterizes bound ribosomes.
a. Bound ribosomes are enclosed in their own membrane. b. Bound and free ribosomes are structurally different. c. Bound ribosomes generally synthesize membrane proteins and secretory proteins. d. The most common location for bound ribosomes is the cytoplasmic surface of the plasma membrane. e. All of the above.
What cytokine stimulates plasma cell secretion of IgE and IgG, and increases the number of class II MHC molecules on B cells and macrophages?
A) interleukin-4 B) interferon- C) interferon- D) interleukin-5 E) interleukin-10
Which feature is an evolutionary novelty of hexapods?
A. Antennae B. Mandibles C. Wings D. Jointed appendages E. Chitinous exoskeletons