During photosynthesis in a leaf, sugars are loaded into the sieve tube by _____ followed by ______ to increase the pressure.
A. osmosis, facilitated diffusion
B. facilitated diffusion, osmosis
C. gravity, active transport
D. active transport, osmosis
E. osmosis, gravity
Ans: D. active transport, osmosis
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Melatonin regulates ____
a. heart rhythms in song birds b. the stimulation of cancer cell growth in humans c. the menstrual cycle in human females d. sleep cycles in humans e. milk production in mammals after giving birth
DPG (2,3?diphosphoglycerate) is produced when
a. carbon dioxide builds up. b. oxygen levels are high. c. tissues chronically receive too little oxygen. d. bicarbonate ion is low. e. sodium levels rise.
Which statement best describes the reproductive isolation between populations of Rhagoletis flies, one of which is found on apple trees and the other that is found on hawthorn trees?
A) Hybrid offspring of the two populations are sterile. B) Hawthorn trees and apple trees grow in different areas, so the two populations do not encounter each other. C) Male flies of one population cannot physically mate with females from the other population. D) Apple-liking males are more likely to encounter apple-liking females than hawthorn-liking females. E) Eggs laid by female flies mated with a male from the "wrong" population do not develop.
ATP is expended in which of the following processes?
A) facilitated diffusion B) diffusion C) group translocation D) active transport E) both active transport and group translocation