By definition, if the DNA of a cell undergoes a spontaneous mutation, is was NOT due to ________.
A. spontaneous depurination of nucleotides
B. insertion of transposons
C. exposure to radiation
D. errors in DNA replication
Answer: C
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Mitochondrial DNA (mtDNA) is helpful in obtaining a DNA profile for very degraded genetic material because
A) cells have many mitochondria, and therefore several copies of mtDNA sequences. B) mitochondria contain oxidative enzymes that protect the DNA. C) mtDNA consists of a single helix, so it cannot be unwound. D) it uses uracil instead of thymine, which is a more stable nitrogenous base.
What would happen if the foramen ovale and ductus arteriosus failed to close?
1.The left side of the heart would serve no role.
2.No blood would go to the lungs.
3.The aorta would be damaged by the input of excessive blood.
4.The oxygen levels of the blood would drop.
The principles of heredity were first established through breeding experiments carried out in ________ by Gregor Mendel
A) the late 1700s B) the 1950s C) the 1860s D) the early 1900s E) the mid-1600s
Which of the following is a specific function of the cerebrospinal fluid?
A) thinking B) promoting inflammation C) bone building D) shock absorption