The semifluid matrix that surrounds organelles in a cell is called the
A. nucleoplasm.
B. cytoplasm.
C. stroma.
D. ribosome.
Answer: B
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Which one of the following statements does not support the argument against multiple independent origins of eyes?
A. The light-sensitive molecule for all lightsensing cells is the same, a derivative of vitamin A complexed with a protein called opsin. B. Eye defects arise from Pax6 mutations in many different organisms. C. Pax6 DNA and protein sequences are highly conserved in a wide range of organisms. D. Pax6 protein is so central to eye development that after transferring the mouse Pax6 to the fruit fly, the fly produced eyes similar to that of a mouse. E. The Pax6 gene evolved early and is shared among a wide range of animals, despite the structural diversity in their final adult eyes.
The process of adding hydrogen to N2, creating NH3 and eventually NH4+, and which requires a substantial input of ATP, is called ____.
a. nitrification b. ammonification c. nitrogen cycling d. nitrogen fixation e. nitrogen assimilation
Which of these occurs during vigorous exercise?
a. glycolysis b. actin depletion c. lactate fermentation d. glycogen buildup
e. creatine phosphate formationWhat technique can be used for studying the gene for cystic fibrosis?
What will be an ideal response?