What is required if a researcher wants to analyze homologous genes in different species?
A. relatively long DNA sequences
B. relatively short RNA sequences
C. relatively short DNA sequences
D. relative differences in the species' metabolisms.
E. relatively short polypeptide sequences
Answer: A
You might also like to view...
H. V. Wilson worked with sponges to gain some insight into exactly what was responsible for holding adjacent cells together. He exposed two species of differently pigmented sponges to a chemical that disrupted the cell-cell interaction (cell junctions)
, and the cells of the sponges dissociated. Wilson then mixed the cells of the two species and removed the chemical that caused the cells to dissociate. Wilson found that the sponges reassembled into two separate species. The cells from one species did not interact or form associations with the cells of the other species. How do you explain the results of Wilson's experiments? A) The two species of sponge had different enzymes that functioned in the reassembly process. B) The molecules responsible for cell-cell adhesion (cell junctions) were irreversibly destroyed during the experiment. C) The molecules responsible for cell-cell adhesion (cell junctions) differed between the two species of sponge. D) One cell functioned as the nucleus for each organism, thereby attracting only cells of the same pigment.
A point mutation is when a single nucleotide gets replaced by a different one
A. true B. false
Mapping human disease genes to their position on the chromosome using genetic polymorphisms is called:
A. outgrouping. B. haplotyping. C. linkage analysis. D. synteny. E. comparative genomics.
Which of the following is a primary lymphoid organ?
A. tonsils B. spleen C. lymph node D. bone marrow E. circulatory system