Membrane-like structures form when proteins or lipids are mixed with water. They serve as a model for __________,
which may have preceded cells. Fill in the blank(s) with the appropriate word(s).
ANSWER: protocells
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Regulatory transcription factors _____
A) influence the binding of sigma factor to DNA B) influence the assembly of the basal transcription complex C) influence the degree of unwinding of DNA at the promoter D) open the two strands of DNA so that RNA polymerase can begin transcription
The leakage of vascular fluid into tissues is called ________.
A. pus B. edema C. diapedesis D. chemotaxis E. vasoactivity
In the reproductive cycle of a fern, a zygote develops into
a. sperm and egg. b. spores. c. a young gametophyte. d. a young sporophyte.
Which factor initiates the intrinsic clotting mechanism?
a. factor X b. factor XI c. factor ACI d. thrombin e. prothrombin activator