Stan, a champion athlete, sleeps up in the mountains at 10,000 feet every night to increase his red blood cell count for better athletic performance. Which hormone increases to make that possible?
A) erythropoietin B) hemoglobin C) fibrin D) Rh factor
Answer: A
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The type of RNA that carries out RNA interference is
A) tRNA. B) mRNA. C) rRNA. D) siRNA.
The phenomenon of microbial antagonism can be explained by
a. certain normal biota directly kill other species by phagocytosis b. normal biota members change the chemical environment making it hostile to other species c. the immune system only recognizes certain species for destruction d. there is limited space for occupation in or on certain areas of the human body
The 3? end of eukaryotic pre-mRNAs are changed by:
a. removing the last phosphate group. b. adding a "cap." c. copying the last few bases so that it can form a duplex structure. d. adding 100?250 adenine nucleotides. e. phosphorylation of the mRNA molecule
Cell theory is one of the foundations of biology. What are the tenets of the cell theory? Check all that apply.
A. Cells arise from other cells through the process of cell division. B. Cells carry genetic material passed to daughter cells during cellular division. C. All organisms are made up of more than one cell. D. Organisms are formed through spontaneous generation E. All living organisms consist of cells F. All cells have the ability to move.