On the Galápagos Islands, the amazing tool-using "woodpecker finch" can modify twigs to pry out grubs. Because there are no true woodpeckers on the Galápagos Islands, this behavior allows this finch to exploit an untapped food source. However, not all members of this species exhibit this behavior, which is probably learned from watching other finches. Therefore,
A. there must be a great advantage to reaching this food source for this learned behavior to be repeated by most descendants of each generation.
B. young chicks isolated at hatching will not know how to do this.
C. it is probably not "hardwired" in the brain as a behavior passed on genetically.
D. All of the choices are correct.
Answer: D
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Which of the following statements about double fertilization in angiosperms is correct?
A) One pollen grain combines with the egg to form the zygote, and one pollen grain combines with the polar nuclei to form endosperm. Two sperm combine with a polar nucleus to form endosperm. B) Two pollen grains combine with two ovules to form the zygote and endosperm. C) One sperm combines with the polar nuclei to form the zygote, and one sperm combines with the egg to form endosperm. D) One sperm combines with the egg to form the zygote, and one sperm combines with the polar nuclei to form endosperm.
Which of the following has the phases of the Calvin-Benson cycle in the correct order, starting with the entry of ribulose 1,5-bisphosphate?
A. Carboxylation phase, reduction phase, regeneration phase B. Reduction phase, carboxylation phase, regeneration phase C. Carboxylation phase, regeneration phase, reduction phase D. Regeneration phase, carboxylation phase, reduction phase
__________ colored light triggers stomatal opening
a. Red b. Blue c. Orange d. Green e. Yellow
Answer the following questions true (T) or false (F)
1. Cleavage and gastrulation take place in animals such as humans and birds but not in frogs. 2. Early vertebrate embryos share a general similarity in shape in the period following somite development. 3. Cells first arrange themselves into layers during organogenesis.