The classic Hershey and Chase (1952 ) experiment that offered evidence in support of DNA being the genetic material in bacteriophages made use of which of the following labeled component(s)?
A) tritium
B) hydrogen
C) nitrogen and oxygen
D) phosphorus and sulfur
E) None of the answers listed is correct.
D
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The three major components of a cell are the nucleus, cytoplasm, and __________
a. plasma membrane b. phospholipids c. epithelium d. receptor proteins
In marine sticklebacks, the Pitx1 gene is ____, but in freshwater sticklebacks, the Pitx1 gene is ____
a. not expressed and spines are present; expressed and spines are absent b. not expressed and spines are absent; expressed and spines are present c. expressed and spines are present; not expressed and spines are absent d. expressed and spines are absent; not expressed and spines are present e. present so spines develop; absent so spines do not develop
When Melvin Calvin and Andrew Benson reduced the CO2 available to cells in the photosynthesis
experiments, they discovered that RuBP accumulated. Why did this molecule accumulate?
a. There wasn't sufficient light to drive photosynthesis. b. The cells had too little ATP. c. There were not enough reactants to generate 3PGA. d. The RuBP was defective in structure and unable to form a bond with CO2. e. Rubisco was inhibited by the RuBP excess.
Explain how the world's food supply may be affected by whether people eat primarily meat or vegetables
What will be an ideal response?