Each condensed chromosome contains a kinetochore within its centromere; kinetochores function _____.
A) to form the binding site, which keeps the sister chromatids together
B) as spools on which the DNA can wind
C) as chaperone proteins that organizes the multiple levels of coiling in mitotic chromosomes
D) as a docking site for the microtubules that will help separate the chromatids
E) as decondensing proteins that facilitate uncoiling once the nuclear division is complete
Answer: D) as a docking site for the microtubules that will help separate the chromatids
You might also like to view...
Griffith, a British microbiologist, used bacteria and mice to demonstrate the process of transformation. During transformation,
A. a bacterial chromosome produces an exact copy of itself. B. the nucleus of a mouse cell repairs itself when damaged by bacterial infection. C. DNA from an infected mouse cell changes bacteria from a non-pathogenic to a pathogenic form. D. genetic material is transferred from one bacterial cell to another. E. a bacterial cell is transformed into a spore during unsuitable environmental conditions.
A 17-year-old male with a severe eye infection admits that he does not clean his contact lenses as often as he should. His eye infection is most likely the result of which parasite?
a. Toxoplasma gondii b. Isospora belli c. Strongyloides stercoralis d. Acanthamoeba spp.
At what stage of the meiotic cell cycle and during what chromosomal configuration does crossing over occur?
A) during bivalent formation, after synapsis of homologous chromosomes, and before the end of prophase I B) in S phase of meiosis C) at the four-strand stage of meiosis, after synapsis of homologous chromosomes, and before the end of prophase I D) during synapsis in prometaphase E) during synapsis at the four-strand stage of meiosis
In 1964, Nirenberg and Leder used the triplet binding assay to determine specific codon assignments. A complex of which of the following components was trapped in the nitrocellulose filter?
A) sense and antisense strands of DNA B) charged tRNA, RNA triplet, and ribosome C) ribosomes and DNA D) uncharged tRNAs and ribosomes E) free tRNAs