Microevolution involves ___
A. changes to the number of individuals in a population.
B. changes in a population's gene pool.
C. a change in the ratio of males to females in a population.
D. the fixation of an allele over a long period of time.
B. changes in a population's gene pool.
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Artemia and Fast Plant™ bioassays can be used to identify
a. cytotoxins. b. herbicides. c. plant growth stimulators. d. all of the above.
Matching. Choose the one most appropriate answer
for each. 1. ___ nephron 2. ___ aldosterone 3. ___ tubular secretion 4. ___ ADH 5. ___ conduction 6. ___ convection 7. ___ pilomotor response 8. ___ ectothermic 9. ___ evaporation 10. ___ glomerular filtration 11. ___ hemodialysis 12. ___ hypothermia 13. ___ heterothermic 14. ___ radiation 15. ___ tubular reabsorption A. do not maintain the same body temperature at all times; are capable of internal heat production B. heat energy is released to the air when liquid water converts to gaseous form C. bulk flow of protein-free plasma from capillaries into Bowman’s capsule D. animals with more or less constant body temperature E. emission of heat from body surface when environmental temperature is lower than the body temperature F. movement of ions from peritubular capillaries into nephron tubules G. loss of too much body heat H. heat next to the body’s surface undergoes mass transport by air or water currents I. active and passive transport of solutes from peritubular capillaries into the glomerular capillaries J. a long, slender, tubular unit in the vertebrate kidney that forms urine K. body temperatures rise and fall with environmental changes L. secreted by adrenal glands; influences sodium reabsorption M. passive transport of water; active and passive transport of solutes out of the nephron into peritubular capillaries N. heat energy is transferred from high to low temperature regions due to collisions between adjacent molecules O. released from the posterior lobe of the pituitary in response to hypothalamic signals P. toxic substances are extracted from blood circulating in cellophane tubes suspended in a warm-water bath Q. erection of hairs and feathers by smooth muscles in the skin
If an individual for whatever reason cannot pass on
its genes to offspring, the best alternative is to show altruism to a. relatives. b. strangers. c. neighbors. d. other species. e. competitors.
In which type of vessel can blood flow be regulated by the nervous system?
a. artery b. arteriole c. capillary d. venule e. vein