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

Biology & Microbiology

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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.

Biology & Microbiology

Which organelles besides the nucleus contain their own DNA?

What will be an ideal response?

Biology & Microbiology

The types of bonds linking nucleotides in nucleic acids are

A. nonpolar covalent bonds. B. phosphodiester bonds. C. peptide bonds. D. ionic bonds.

Biology & Microbiology

Which of the following families of DNA viruses is the most prevalent in humans?

A. Poxviridae B. Herpesviridae C. Adenoviridae D. Polyomaviridae E. Rhinoviridae

Biology & Microbiology