In autumn, the leaves of deciduous trees change colors. This is because chlorophyll is degraded and _____
A) carotenoids and other pigments are still present in the leaves
B) the degraded chlorophyll changes into many other colors
C) water supply to the leaves has been reduced
D) sugars are sent to most of the cells of the leaves
A
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Looking at the data in the figure above from the hare/lynx experiment, what conclusion can you draw?
I) Food is a factor in controlling hare population size. II) Excluding lynx is a factor in controlling hare population size. III) The effect of excluding predators and adding food in the same experiment is greater than the sum of excluding lynx alone plus adding food alone. A) only I B) only II C) only III D) only II and III E) I, II, and III
Cilia and flagella ____
a. are found only in cells that are actively moving b. are found only in sex cells and unicellular organisms c. use motor proteins to induce movement d. may also function as receptor sites for certain hormones e. are found only in unicellular organisms
A storm blows a small group of migrating birds off course and they land on an island where they remain for 100 generations. At this time a second storm brings more birds from the mainland population to the island. These new birds cannot mate with the established birds even though they are woriginally from the same population. What mechanisms are likely to have been involved in bringing about this speciation? Select all that apply.
A. Polyploidy in the mainland bird population. B. Founder effect C. Genetic drift D. Adaptation to a new ecological niche
Match the target of the G protein with the appropriate signaling outcome
adenylyl cyclase ________ A. cleavage of inositol phospholipids ion channels _________ B. increase in cAMP levels phospholipase C _________ C. changes in membrane potential Fill in the blank(s) with correct word