Allen's rule states that mammals from colder climates have shorter ears and appendages than individuals of the same species from warmer areas. The related Bergman's rule states that mammal body size varies with latitude, with larger body size in populations located closer to the poles and smaller body size in populations located closer to the equator. What can explain both of these rules?
A. Larger bodies can store proportionally more fat as insulation than smaller bodies.
B. Smaller bodies can store proportionally more fat as insulation than larger bodies.
C. Heat loss increases as the surface area to volume ratio of the animal increases.
D. Larger bodies have a proportionally larger surface area, and heat radiation varies with volume.
E. Smaller bodies have a proportionally smaller surface area, and heat radiation increases with surface area.
C. Heat loss increases as the surface area to volume ratio of the animal increases.
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Briefly describe the life cycle of an earthworm.
What will be an ideal response?
A mutation is more likely to affect a differentiated cell than a stem cell due to
A) skewed distribution of parental versus newly replicated DNA. B) a conscious effort on the part of the individual. C) lack of DNA replication in stem cells. D) skewed distribution of stem and progenitor cells.
Identify the stage of mitosis in photo A
a. interphase b. prophase c. metaphase d. anaphase e. telophase
A lung specimen from a pneumonia patient contains Gram-negative bacilli. Laboratory test results on the bacteria show they are non-motile coliforms with a thick capsule. Which pathogen is the likely cause of the pneumonia?
A. Escherichia coli B. Enterobacter C. Hafnia D. Klebsiella E. Serratia