Phylogenetic trees are constructed based on morphological characteristics, but molecular phylogenetic trees are constructed based on which feature?
What will be an ideal response?
nucleic or amino acid sequence
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In a reversible chemical reaction at equilibrium, the concentration of X (the reactant) is 0.75 mol/L, and the concentration of Y (the product) is 2.25 mol/L. At 25°C, what would be the Keq?
A) 0.33 B) 3.0 C) 1.69 D) 1.50 E) 37.5
Who are responsible for discovering the structure of DNA?
A. Francis Crick and James Watson B. Matthias Schleiden and Theodor Schwann C. Charles Darwin and Joseph Farman D. Anton van Leeuwenhoek and Theodor Schwann E. Theodor Schwann and Robert Hooke
In biological membranes, the phospholipids are arranged in a
A) single layer, with the fatty acids facing the interior of the cell. B) bilayer, with the phosphorus groups in the interior of the membrane. C) bilayer, with the fatty acids pointing toward one another. D) single layer, with the phosphorus-containing region facing the interior of the cell. E) bilayer, with the fatty acids facing outward (facing the interior and exterior of the cell).
The ABO antigens and Rh antigens are the only blood groups considered before a transfusion.
Answer the following statement true (T) or false (F)