Sulfa antibiotics damage bacteria by affecting a certain bacterial enzyme. The sulfa antibiotic looks similar to a substrate normally required by the bacterial cells to live
The sulfa antibiotic occupies the active site of the required enzyme and blocks entry of its normal substrate. This prevents the bacteria from making nucleotides that are required for their reproduction and survival. Based on this information, the action of sulfa antibiotics is an example of
A) activation energy. B) denaturing of proteins.
C) electron carriers. D) competitive inhibition.
D
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Staphylococcus aureus is a gram-positive organism that produces the enzyme ?-lactamase, which renders certain types of antibiotics inactive. The mode of action that is prevented in certain antibiotics sensitive to this enzyme is:
a. cell wall synthesis. b. protein synthesis to the 30S ribosomal subunit. c. protein synthesis to the 50S ribosomal subunit. d. deoxyribonucleic acid (DNA) synthesis.
Which of the following represents the high energy bond in ATP?
a. the bond between the ribose and adenine b. the bond between the alpha phosphate group and the ribose c. the bond between the phosphate groups d. the bond between the gamma phosphate and the water molecule
As cell lineages use varying subsets of genes during development, they become specialized through a
process called __________. Fill in the blank(s) with the appropriate word(s).
What is the sequence and polarity of the DNA strand complementary to the strand 5? AAATGTCCATGC 3??
A) 5? TTTACAGGTACG 3? B) 3? AAATGTCCATGC 5? C) 3? TTTACAGGTACG 5? D) 5? UUUACAGGUACG 3? E) 3? UUUACAGGUACG 5?