Classification.Answer the following questions in reference to the five nucleotides listed below.
A. This nucleotide is a double-ring molecule.
B. Three hydrogen bonds connect guanine to __________ in the DNA molecule.
C. If one chain of a DNA molecule has a purine at a given position, this nucleotide complements it on the other chain.
D. Erwin Chargaff's data indicates that within a species, the amount of adenine is always equal to the amount of this nucleotide.
E. This nucleotide is not incorporated into the structure of the DNA helix.
A. Guanine
B. Cytosine
C. Pyrimidine
D. Thymine
E. Uracil
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Which of the following diseases is associated with faulty DNA repair mechanisms?
A. Alzheimer's disease B. diabetes C. xeroderma pigmentosum D. diabetes and xeroderma pigmentosum E. Alzheimer's disease and diabetes
Researchers are interested in the genomes of prokaryotic species for all of the following reasons EXCEPT
A. bacteria cause many diseases that affect people, plants, and animals. B. bacteria reveal modes of infection. C. bacteria are more complex than humans. D. the origin of the first eukaryotic cell probably involved a union between an archaeal and a bacterial cell. E. All of the choices are reasons for studying genomes of prokaryotic species.
Which component of a nephron receives fluid from the proximal convoluted tubule?
A) loop of the nephron. B) distal convoluted tubule. C) glomerulus. D) collecting duct
An ion is formed ____
a. during covalent bonds b. when water molecules are bound together c. when atoms exchange electrons d. when atoms share electrons equally e. when atoms share electrons unequally