Which individual compared rRNA sequences to generate the tree of life, establishing the three-domain system?
a. Frederick Griffith
b. Carl Woese
c. Robert Hooke
d. Robert Koch
Answer: B
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Which of the following creates double-stranded breaks to initiate recombination in eukaryotes?
A. Spo11 B. RuvAB C. Rad50 D. Sgs1 E. Dmc1
Answer the following statement(s) true (T) or false (F)
1. An application of too much fertilizer will negatively affect the movement of materials in the phloem. 2. A decrease in the availability of ATP in a root cell could decrease the water potential of the cell. 3. If a mutation decreased the radius of a xylem vessel threefold, there would be an 81-fold increase in the volume of liquid moving through the vessel. 4. An increase in root pressure will result in the rapid release of abscisic acid (ABA) and the subsequent opening of the stomata. 5. If the proton pumps of guard cell were damaged, transpiration would decrease.
Which of the following substances is secreted by an endocrine gland?
a. Tears b. Breast milk c. Wax d. Saliva e. Hormones
What separates the strands of DNA in the polymerase chain reaction (PCR) technique?
A. Centrifuge B. Heat C. Restriction enzymes D. Helicase