A scientist wishes to develop an antimicrobial agent that specifically targets replication elongation in Escherichia coli without interfering with proteins that catalyze other replication processes. Which of the following experimental designs is most appropriate for the scientist to explore?
A. Create a novel protein that acts as a competitive inhibitor of the DNA ligase binding site.
B. Modify an existing antibiotic to act as a competitive inhibitor of DNA polymerase I.
C. Design a drug that modifies the structural configuration of DNA at the oriC locus.
D. Develop a molecule that interferes with the DNA-binding ability of DNA polymerase III core enzyme.
Answer: D
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The choanocytes have a flagellum that moves water through the sponge and a collar that extracts food particles from the water. In what group have you encountered very similar cells before?
A. the choanoflagellates B. the chytrids C. the Euglenozoa D. the charophytes E. the Foraminifera
Nondisjunction can occur during _____ of meiosis
a. anaphase I b. telophase I c. anaphase II d. [anaphase I] and [anaphase II]
Which of the following statements about an organ is false?
A) An organ represents a higher level of structure than the tissues composing it. B) An organ consists of several tissues. C) An organ can only carry out the functions of its component tissues. D) An organ consists of many cells.
Whisk ferns, club mosses, and horsetails have all the following characteristics in common with ferns except:
A. all of these plants are seedless tracheophyte plants. B. all of these plants produce flagellated sperm. C. all of these plants form antheridia and archegonia. D. all of these plants require free water for the process of fertilization to occur. E. all of these plants have no vascular tissue.