Through the study of mitochondrial disorders, scientists have suggested a link between the decline of mitochondrial function and aging. What process appears to be involved in this suspected phenomenon?
A) accumulation of sporadic mutations in the nuclear genome
B) accumulation of mutations in the mtDNA
C) recombination of mtDNA and nuclear DNA
D) decline of mutations in the nuclear genome
E) recombination among mtDNAs of different mitochondria
Answer: B
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When Mendel crossed two plants that were heterozygous for a single trait, what was the genotypic ratio of their offspring?
A. 1:2:1 B. 9:3:3:1 C. 3:1 D. 1:1 E. Varied depending on the trait
Which of the following connects bones to muscles?
a) ligaments b) tendons c) synovium d) suture
Animal cells have "counters" that keep track of how many times a cell has divided. These counters are called:
A) centromeres. B) odometers. C) telomeres. D) nuclei. E)chromosomes.
A chromosome in which the linear order of a group of genes is repeated has a(n)
a. deletion. b. translocation. c. duplication. d. inversion.