Compare and contrast DNA and RNA. Include the similarities and differences in their chemical composition and
structure, as well as their general roles within the cell. What will be an ideal response?
DNA and RNA are both polynucleotides. DNA is double-stranded, contains deoxyribose, and
contains thymine instead of uracil. RNA is shorter, usually single-stranded, contains ribose,
and contains uracil instead thymine. The sequence of bases in DNA determines the sequence
of amino acids in a protein, and various types of RNA function as intermediaries between
DNA and protein
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In a system in which temperature is uniform, free energy is
a. the energy available to do work. b. equivalent to entropy. c. the total energy absorbed by the system d. the kinetic energy of the system e. the total energy of the system.
Both low birth and death rates characterize the demographic transition. Which factors will lower birth and death rates for twenty-first century Homo sapiens?
What will be an ideal response?
What powers the ATP synthase enzyme in the light-dependent reactions of photosynthesis?
a. energy from ATP b. energy from NADPH c. energy from the splitting of water d. energy from electron transfer chains e. energy from the flow of hydrogen ions
The front limbs of birds and bats -- both wings -- are considered to be:
a. homologous structures. b. homozygous structures. c. divergent structures. d. vestigial structures. e. homoplastic structures.