Choose the description below that best matches the current model of RNA polymerase holoenzyme.
A. A core enzyme composed of five sigma factors bound by a polypeptide chain.
B. A core enzyme composed of five polypeptides bound by ribosomes.
C. An open complex or "bubble" formed by DNA, mRNA, and RNA polymerase.
D. A core enzyme composed of five polypeptides bound by a transcription factor.
Answer: D
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Members of the genus Micrococcus are usually ________.
A. microaerophilic B. facultatively anaerobic C. aerobic D. anaerobic
Which of the following organs of cephalopods resemble those of the vertebrates?
A. arms B. nephridia C. eyes D. digestive tissues E. foot
Which of the following is not a characteristic of parenchyma cells?
a. They all lack the ability to photosynthesize. b. They can differentiate into other kinds of cells in response to an injury to the plant. c. They may contain various storage materials, such as starch grains, oils, or water. d. They must be living cells in order to function. e. They may secrete substances of various types.
Explain how Bowman's capsule works.
What will be an ideal response?