Why is the DNA of humans and chimpanzees so very similar?
What will be an ideal response?
The split between humans and the line leading to apes and chimpanzees occurred recently-only about 5 million years ago. The genes of these two groups have not had the time to evolve many differences. So today, human and chimp DNA differ in surprisingly just 3% of their nucleotide sequences.
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The structure of bacterial chromosomes differs from that of eukaryotic organisms in all of the following except:
a. bacterial chromosomes are typically cir-cular. b. the genes are polycistronic. c. the bacteria have two copies of each chromosome. d. bacterial mutations are easily transmitted or inherited.
The presence of ____ in urine indicates a pregnancy
a. estrogen b. progesterone c. human chorionic gonadotropin d. follicle-stimulating hormone e. luteinizing hormone
Tonicity refers to
a. the total concentration of solutes in fluids separated by a selectively permeable membrane. b. the pressure exerted by the fluids surrounding a cell. c. the amount of negative versus positive charges of the molecules and ions in a solution. d. how able a cell is to resist changes in solute concentrations without bursting or shrinking. e. the ease with which solutes can cross a particular cell membrane
Without data from the base composition studies of Chargaff, what might Watson and Crick's modeling studies have erroneously concluded?
A. Bases could pair with themselves (e.g., A with A, C with C). B. Any purine could pair with any purine. C. Any purine could pair with any purine and any pyrimidine could pair with any pyrimidine. D. Any purine could pair with any pyrimidine. E. Any pyrimidine could pair with any pyrimidine.