Comparative genomics can be used to identify:
A. homologs, genes having demonstrable sequence similarity.
B. homologs, genes having demonstrable sequence similarity and function.
C. orthologs, genes in the same species that have demonstrable sequence similarity.
D. orthologs, genes in the same species that have demonstrable sequence similarity and function.
E. paralogs, genes in different species that have clear sequence similarity to each other.
A
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You identify an enzyme involved in a cellular reaction. How does the enzyme affect the reaction equilibrium between reactants and products and the time needed to reach equilibrium?
A. It alters the reaction equilibrium and shortens the time needed to reach equilibrium. B. The reaction equilibrium is unaffected, but it shortens the time needed to reach equilibrium. C. It alters the reaction equilibrium and lengthens the time needed to reach equilibrium. D. The reaction equilibrium is unaffected, but it lengthens the time needed to reach equilibrium.
What feature, among living animals, is completely unique to birds?
a. Laying amniotic eggs b. Four chambered heart c. The ability to fly d. Feathers e. Making a nest for rearing the offspring
Lactose is a disaccharide found in milk. What makes some people "lactose intolerant" as adults?
A) Some people don't produce any enzymes, including the one needed to digest lactose. B) Lactose can only be digested by people who produce enough lipase to digest it. C) Lactose-intolerant people don't produce adequate amounts of lactase. D) The active site of the lactose-digesting enzyme can vary from person to person.
Bacterial populations have been exposed to an antibiotic and have developed resistance to the antibiotic over time
Would this be an example of stabilizing selection, directional selection, or disruptive selection? Explain your reasoning. What will be an ideal response?