Describe two mechanisms that Archaea use to avoid their DNA melting at temperatures above 100 °C
What will be an ideal response?
Answer: Answers will vary. One mechanism involves reverse DNA gyrase which introduces positive supercoils in the DNA and prevents the spontaneous unwinding of the double helix. Another mechanism hyperthermophilic Archaea use is the processing of DNA into nucleosome-like structures, which involves positively charged proteins binding to DNA, and the formation of compacted and protected DNA.
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Describe the difficulty in distinguishing a cell in the late stages of prophase and the early stages of metaphase
What will be an ideal response?
Which type of cell structure is the nucleolus organizer (NOR) responsible for producing?
What will be an ideal response?
Metanephridial organs are common in:
a. mollusks. b. flatworms. c. cnidarians. d. sponges. e. insects.
DNA contains all of the following nitrogen-containing bases EXCEPT ____.
A. adenine B. uracil C. guanine D. cytosine E. thymine