The cell-mediated immune response is brought about by which cells?
A. Neutrophils
B. B cells
C. Erythrocytes
D. T cells
E. Monocytes
Answer: D
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As arthropods grow, they shed their exoskeletons at periodic intervals, allowing growth before formation of a new exoskeleton. This process of shedding the exoskeleton is known as:
A. expansion. B. a growth spurt. C. differentiation. D. molting.
Which of the following gives the correct rank order for relative toxicity (most to least) of the primary nitrogenous wastes used by different animals?
A. ammonia ? urea ? uric acid B. uric acid ? ammonia ? urea C. urea ? uric acid ? ammonia D. ammonia ? uric acid ? urea E. urea ? ammonia ? uric acid
What is critical to the development of neural crest cell derivatives?
A. close contact with the notochord B. regulation of N-cadherin C. muscle development genes like muscle myosin D. strong cellular adhesions that lock the cells in the place of their origin
What two organelles are both responsible for converting energy into forms that can be used by cells?
a. ribosomes and chloroplasts b. lysosomes and chloroplasts c. mitochondria and lysosomes d. mitochondria and peroxisomes e. mitochondria and chloroplasts