An unrooted tree containing four unrelated species can become rooted by adding
A. a descendant group related to two of the species.
B. an unrelated outgroup.
C. a descendant related to only one of the species.
D. a distantly related outgroup.
Answer: D
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What is the ?G for the inward transport of sodium ions?
For a particular cell at 25°C, the concentration of sucrose is 10 mM on the inside of the cell and 0.5 mM on the outside, whereas the concentration of sodium ions (Na+) is 0.5 mM on the inside of the cell and 10 mM on the outside. The membrane potential is -150 mV. Constants: R = 1.987 cal/mol-K; T = 25°C = 298 K; F = 23,062 cal/mole-volt A) +5.233 kcal/mol; an endergonic reaction B) +5.233 kcal/mol; an exergonic reaction C) ?5.233 kcal/mol; an endergonic reaction D) ?5.233 kcal/mol; an exergonic reaction E) None of the above are correct.
Which organelles besides the nucleus contain their own DNA?
What will be an ideal response?
The types of bonds linking nucleotides in nucleic acids are
A. nonpolar covalent bonds. B. phosphodiester bonds. C. peptide bonds. D. ionic bonds.
Which of the following families of DNA viruses is the most prevalent in humans?
A. Poxviridae B. Herpesviridae C. Adenoviridae D. Polyomaviridae E. Rhinoviridae