What is the role of proton pumps in root hair cells?
A) establish ATP gradients
B) maintain the H+ gradient
C) pressurize xylem transport
D) eliminate excess electrons
E) assist in active uptake of water molecules
Answer: B) maintain the H+ gradient
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In poultry, the genes for rose comb (R) and pea comb
(P) produce walnut whenever they occur together (R__ P__); single-combed individuals have the homozygous condition for both genes (rr pp). (a) Give the F1 and F2 phenotypic results of a cross of a pure-breeding rose comb (RR pp) with a pure-breeding pea comb (rr PP). (b) Give the phenotypic results of a cross of Rr Pp x rr Pp. (c) Give the phenotypic results of a cross of RR Pp x rr Pp. (d) Give the phenotypic results of a cross of Rr pp x rr Pp. (e) Give the phenotypic results of a cross of Rr Pp x rr pp. What will be an ideal response?
Four of the five factors listed below are densityindependent
factors. Select the exception. a. nutrient supply b. temperature drop c. drought d. volcanic eruption e. hard freeze
What is directly responsible for pumping protons out of the mitochondrial matrix?
a. protein complexes I, II, III, and IV b. cytochrome c and ubiquinone c. protein complexes I and III d. protein complexes I, III, and IV e. NADH and FADH2
Which time period would hold the record of the oldest fossils of multicellular animals, found in mountainous areas of
South Australia, and parts of Canada and China? a. Edicarian b. Devonian c. Cambrian d. Cretaceous e. Ordovician