Which of the following are purine nitrogenous bases?
A) cytosine and guanine
B) guanine and adenine
C) adenine and thymine
D) thymine and uracil
E) uracil and cytosine
Answer: B
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What is a hybrid zone?
a. an area where no hybrids exist b. an area where two populations may breed and produce inviable, fertile offspring c. an area where two populations may breed and produce inviable, infertile offspring d. an area where two populations may breed and produce viable, fertile offspring e. an area where two populations may breed and produce viable, infertile offspring
Glycolysis is a metabolic process that is conducted by nearly all cells. However, in addition to glycolysis, some cells also make use of another metabolic process called the Krebs cycle. What does this tell you about the evolution of these processes?
A. Both the Krebs cycle and glycolysis likely evolved at the same time B. As a metabolic process, glycolysis likely evolved prior to the Krebs cycle C. As a metabolic process, the Krebs cycle likely evolved prior to glycolysis
A fly embryo that expresses the bicoid mutant phenotype
A. may be either genetically wild-type or mutant for bicoid, but definitely has a bicoid mutant mother. B. is mutant for bicoid and has a bicoid mutant mother. C. is genetically wild-type, but has a bicoid mutant mother. D. can be either genetically wild-type or mutant for bicoid. The genotype of the mother cannot be determined from the information provided.
What is an endergonic reaction?
What will be an ideal response?