Which of the following statements about non-coding DNA is TRUE?
The role of non-coding DNA is understood to be extra genes that only get turned on in situations where the regular genes become damaged.
Non-coding DNA can only occur between genes, not within genes themselves.
"Junk DNA" refers to the proportion of base sequences in DNA that do not code for anything and seem to have no obvious purpose.
Bacteria have the most non-coding DNA; more than 90% of their genome contains introns.
Fruit flies are one of few organisms to have less coding DNA than humans.
"Junk DNA" refers to the proportion of base sequences in DNA that do not code for anything and seem to have no obvious purpose.
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Molecular barcodes are
A. barcodes stamped on vegetables in the supermarket to indicate freshness. B. DNA sequences used to identify and catalog biodiversity. C. radioactively labeled genes used to detect horizontal transfer of genes. D. genetic inversions used to detect crossovers.
Using the information presented in the figure above, where nuclear DNA was digested with MstII,
subjected to gel electrophoresis, and probed in a Southern blot with the indicated probe, which lane shows an individual that is heterozygous for sickle cell?
a. 1 b. 2 c. 3 d. 4 e. 5
____ is a polysaccharide that is found in plant cell walls and accounts for their strength.
a. Enzyme b. Cellulose c. Starch d. Cytoplasm e. Peroxisome
The primate ancestors, tree-dwelling insectivores, had two distinct evolutionary advantages: grasping fingers and toes, and
A. a complete digestive tract. B. hair. C. binocular vision. D. mammary glands.