Researchers tend to name genes based on what
happens in their absence. The tinman gene in
Drosophila results in flies
a. without hearts.
b. with nonjointed legs.
c. with a thick exoskeleton.
d. with rust colored eyes.
e. without brains.
Answer: a
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Dendritic cells
A. contain granules with histamine and other pharmacologically active substances that contribute to the inflammatory response. B. are capable of recognizing specific pathogen-associated molecular patterns and play an important role in nonspecific resistance. C. are mainly important in the defense against protozoan and helminth parasites. D. play an important role in the development of allergies and hypersensitivity.
Which of the following statements is false?
a. Behavior patterns are inherited. b. Instinctive behavior involves a complete response to a sign stimulus the first time it is encountered. c. Behavior evolves as a result of natural selection. d. Reproductive success is responsible for perpetuating behavior patterns. e. The mechanisms underlying instinctive and learned behavior are the same.
Upon ingestion of a food particle by a protozoan, the food particle is in a(n) ________.
A. mitochondrion B. endoplasmic reticulum C. phagocytic vacuole D. lysosome
The sequence for the processing of proteins originating outside of the cell involves which of the following?
A. Proteins are broken into fragments, transported to the rough endoplasmic reticulum, fuse with a Golgi vesicle containing class II MHCs, and this complex is transported to the plasma membrane. B. Proteins are broken into fragments within a vesicle, which fuses with a Golgi vesicle containing class I MHCs, and this complex is transported to the plasma membrane. C. Proteins are broken into fragments within a vesicle, which fuses with a Golgi vesicle containing class II MHCs, and this complex is transported to the plasma membrane. D. Proteins are broken into fragments, transported to the rough endoplasmic reticulum, combined with class II MHCs, move to the Golgi apparatus, then to the plasma membrane. E. Proteins are broken into fragments, transported to the rough endoplasmic reticulum, combined with class I MHCs, move to the Golgi apparatus, then to the plasma membrane.