Which is an example of subfunctionalization of a gene duplicate?
A. Gene duplication leads to new combinations of existing exons, as in the jingwei locus
B. A duplicate of a metabolic gene evolves to work as an antifreeze protein in an Arctic fish.
C. Retrotransposition of the Alu elements into many positions in the genome
D. Duplication of hemoglobin genes allows specialized versions to be expressed in fetus vs. adult.
E. A gene is duplicated to a new position in the genome, but its regulatory elements are missing, so it is never expressed.
Answer: D. Duplication of hemoglobin genes allows specialized versions to be expressed in fetus vs. adult.
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Dr. Ratard was trying to determine the cause of a mysterious epidemic affecting fish in the gulf of New Mexico. His proposal that the deaths were caused by an organism called a protist is considered a(n) _________
A. theory. B. data set. C. hypothesis. D. conclusion. E. experiment.
Which of these processes brings into the cell large macromolecules and particles by the formation of a vesicle in the outer membrane?
A) facilitated transport B) endocytosis C) pinocytosis D) exocytosis
Early animal embryos are composed of stem cells, unspecialized cells that are capable of dividing and renewing themselves for long periods
If a stem cell divides by mitosis so that one cell eventually becomes part of the brain and the other cell becomes part of a salivary gland, the cells have A) differentiated. B) diffused. C) taken up genes from surrounding cells. D) lost genes. E) increased their genetic variability.
Nucleotides in each strand of DNA are held together by what type of bonds?
a. ionic b. phosphodiester c. peptide d. hydrogen