In eukaryotes, specific transcription factors have two distinct domains:
A. a DNA-binding domain and a RNA-binding domain.
B. a DNA-binding domain and an operator domain.
C. a DNA-binding domain and a repressor domain.
D. a DNA-binding domain and an enhancer domain.
E. a DNA-binding domain and an activation domain.
Answer: E
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Use the following information to answer the question(s) below
Due to its system of air sacs connected to the lungs, the respiratory system of birds is arguably the most effective respiratory system of all air-breathers. Upon inhalation, air first flows into posterior air sacs, then into the lungs, and then into anterior air sacs on the way to being exhaled. Thus, there is one-way flow of air through the lungs, along thousands of tubules called parabronchi. If the inner lining of the air sacs is neither thin nor highly vascularized, then what can be inferred about the air sacs? A) They must not belong to the respiratory system. B) They cannot be derived from endoderm. C) They are not efficient sites of gas exchange between air and blood. D) They must obtain nutrition from some source other than the bloodstream. E) They cannot effectively moisturize the air before it reaches the lungs.
Explain how, when improper base pairing escapes repair by the proofreading system, cells are able to detect and repair mutations
What will be an ideal response?
The Y-shaped part of the DNA molecule where the actual replication process occurs is called the replication ________.
A. junction B. fork C. tongue D. splice
Tanisha and Tawanda are twins but do not look alike. They are the result of fertilization of
A) one oocyte by two sperm cells. B) two oocytes by one sperm cell. C) two oocytes by two sperm cells. D) one oogonium by one spermatogonium.