Which of the following is an example of homeostasis?
a. A snake rests in the sun on a summer day, and its body temperature eventually becomes too hot for survival
b. A human participates in vigorous activity on a hot day and eventually suffers from dehydration.
c. A cactus stores water during wet periods, allowing it to live through dry periods
d. A human body loses too much heat on a cold day, and hypothermia occurs
c. A cactus stores water during wet periods, allowing it to live through dry periods
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P, D, and Q are three genes found on a single chromosome in greyhounds. The recombination frequencies between the three genes are shown below. In which order are these genes found on the greyhound chromosome? P - D = 50%; P - Q = 20%; D - Q = 30%
A. P-Q-D B. P-D-Q C. Q-D-P D. D-P-Q E. It is impossible to determine.
The bones that make up the digits of the hands or feet are known as the ________
A) metatarsals B) carpals C) phalanges D) tarsals
A cuboidal shaped cell with six sides is 1mm x 1mm x 1mm. What is the volume and the surface area of the cell?
A. 3mm3 : 1mm2 B. 3mm3 : 3mm2 C. 1mm3 : 6mm2 D. 1mm3 : 3mm2
Fibroblasts organize the collagen of the extracellular matrix by ______________
(a) cutting and rejoining the fibrils. (b) processing procollagen into collagen. (c) twisting fibrils together to make ropelike fibers. (d) pulling the collagen into sheets or cables after it has been secreted.