The first human genetic disease to be successfully treated by gene therapy was ________
A) cystic fibrosis
B) sickle cell anemia
C) chronic myelogenous leukemia
D) adenosine deaminase deficiency
E) albinism
D
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Centrioles, cilia, flagella, and basal bodies have remarkably similar structural elements and arrangements. Which of the following hypotheses is most plausible in light of such structural similarities?
A) Cilia and flagella arise from centrioles. B) Loss of basal bodies should prevent cells from dividing in two. C) Motor proteins such as dynein must have evolved before any of these four kinds of structure. D) Cilia and flagella evolved separately in the same ancestral eukaryotic organism. E) Natural selection for cell motility repeatedly selected for microtubular arrays in circular patterns in the evolution of each of these structures.
Lipids are the only class of macromolecules that contain:
A. amino acids. B. nucleotides. C. fatty acids. D. phosphate groups. E. monosaccharides.
Two genes (A and B) are located on each of two pairs of homologous chromosomes. In a tetrad, one sister chromatid
contains alleles ab, while the other sister chromatid contains alleles AB (upper and lower case indicate different alleles of the same gene). Which genetic combinations are possible in the four gametes that are produced from a single chiasma between these chromosome pairs?
a. Ab, AB, ab, aB b. Ab, Ab, aB, aB c. Aa, Bb, ab, Ab d. Ab, Ab, AB, AB e. AB, AB, ab, ab
A theoretical concept that is used to understand how and why certain organisms can be sorted into discrete taxonomic groups is known as the ________.
A. species concept B. phylogenetic concept C. endosymbiotic theory D. genotypic concept