The mites and ticks carry their mouthparts on a little anterior projection called the
a. Hypostome
b. Rostrum
c. Capitulum
d. Pedipalp
e. Pectin
Answer: c. Capitulum
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Many animals share homologues of the gene PAX6, which is important in the development of ________
a. legs b. eyes c. segmentation d. wings
A child may be given the vaccine for chickenpox. If the child goes to school and plays with other children who have the chickenpox virus, the vaccinated child will not get sick. Why is this?
A) Vaccines act like antibiotics so that any organism in the body will be destroyed before the immune system has to respond. B) Vaccines introduce a friendly virus into cells so they cannot be infected with a second virus. C) Vaccines produce a primary response in which memory cells are generated that respond rapidly in a second exposure. D) Vaccines stimulate macrophages to work extra hard to fight infections.
What happens next after the hormone glucagon binds to a G-protein coupled receptor (GPCR)?
A. The glucagon enters the cell through the GPCR and diffuses to the nucleus where it interacts with transcription factors. B. The G-protein loses GDP and gains GTP becoming activated. C. The G-protein loses GTP and gains GDP becoming activated. D. The G-protein loses GTP and gains GDP becoming inactivated. E. The G-protein loses GDP and gains GTP becoming inactivated.
Protection from infection known as species resistance is a result of
A. the lack of suitable environment in the body. B. the absence of receptors required for microbial attachment. C. the presence of phagocytes in the tissues. D. the salty, acidic condition of normal skin. E. both the absence of necessary receptors and lack of suitable environment in the body.