Two genes within an organism that arose from the duplication of a single gene in an ancestor are ________.
Fill in the blank(s) with the appropriate word(s).
paralogs
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Which of the following is true of introns?
A. RNA II polymerase transcribes the intronsequences along with exon sequences. B. More DNA of the human genome is devoted to exons than to introns. C. Introns are not found in bacteria or archaea, only eukaryotes. D. When annealing mature mRNA to corresponding chromosomal DNA sequences, the mRNA will form loops with intron sequences looped out.
Which of the following is an egg-laying mammalian group?
a. monotremes b. eutherians c. polytherians d. metatherians e. marsupiums
Sulfa drugs like Bactrim, given for bacterial infections, inhibit bacteria by blocking folic acid synthesis. The precursor molecule of folic acid is para-amino benzoic acid (PABA). Interestingly, PABA has a structure very similar to a sulfa drug. If a sulfa drug is present, the bacterial enzyme will bind the sulfa drug because of structural similarity. This is an example of ________.
A. competitive inhibition B. noncompetitive inhibition C. catabolite repression D. enzyme repression E. enzyme induction
Red algae ____
a. are primarily marine organisms b. are thought to have developed from green algae c. contain xanthophylls as their main accessory pigments d. are actually brown e. are primarily freshwater organisms