What is the function of the vir genes carried by the Ti plasmid?
What will be an ideal response?
Ans: The vir ("virulence") genes are responsible for transferring the T-DNA from the bacterial cell to the nucleus of the plant cell, where it integrates with a plant chromosome. The vir genes themselves are not part of the transferred DNA.
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Within its core a nucleosome contains ____ histones.
A. 2 B. 4 C. 6 D. 8 E. 64
Choose the true statement(s) about the evolutionary divergence of horses in North America. Check all that apply.
_____ Most changes are seen as adaptations for life in grassland habitats. _____ The general trends during horse evolution are increase in body size, lengthening of limbs, reduction of digits on both sets of limbs, and tooth development for a grazing life style. _____ Horse evolution is unusual in that rates of change were uniform and constant throughout most lineages. _____ Living lineages of horses show much less diversity than existed in the past.
The response to touch by such plants as the sensitive plant is due to:
A. changes in water content of cells B. changes in electrical impulses at the touched area C. auxin displacement in the touched area D. effect of gibberellins on the area affected E. sensitive responder cells
Somatic cells are ________
A) haploid (n) B) haploid (2n) C) diploid (n) D) diploid (2n)