Which of the following would, if it had acted upon a gene, prevent this gene from acting as a reliable molecular clock?
A) neutral mutations
B) genetic drift
C) mutations within introns
D) natural selection
D
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Review Figure 19.15 below: Which one of the following statements about the lactose operon is not correct?
A. The lacZ coding sequence for - galactosidase and lacY coding sequence for lactose permease are genes called structural genes. B. lacO is a gene sequence coding for the operator. C. The promoter sequence recruits RNA polymerase complex and the initiation of transcription. D. lacI is a gene sequence coding for the repressor which binds to the operator, inhibiting transcription. E. The CRP-cAMP binding site promotes transcription of lactose operon genes if cAMP is high, which indicates that glucose is low and lactose metabolism is needed for energy production.
While running in a garden, a girl steps on an old board and a nail goes through her shoe and skin,
causing a deep puncture wound. Which of the following non-specific defense mechanisms will aid in defense from pathogens?
a. epithelial cells with cilia b. lysozyme c. acidic skin secretions d. inflammation e. natural killer cells
What key advantage do angiosperms have over gymnosperms?
A. Angiosperms go through alternation of generations. B. The angiosperms can produce spores which are more stable than seeds from gymnosperms. C. Angiosperms produce pollen and do not require water to reproduce. D. Angiosperms can produce flowers and fruits to aid in seed dispersal. E. Angiosperms have a vascular system, which allowed them to grow taller.
An organism is a multicellular heterotroph made up of eukaryotic cells lacking cell walls. Into which taxonomic group should the organism be classified?
a) animals b) plants c) protists d) fungi