In light of our recent knowledge of the sources of regulatory RNA, evaluate the idea that vast stretches of the eukaryotic genome are "junk" DNA
What will be an ideal response?
Ans: Recent experiments involving whole-genome tiling arrays or whole-cell RNA sequencing have shown that the majority of the eukaryotic genome is transcribed. Many of these transcripts must act as regulatory RNAs, probably as antisense RNAs that regulate the expression of other genes. It now appears that much of the noncoding portion of the eukaryotic genome is functional, not "junk."
You might also like to view...
In placental mammals such as humans the dosage compensation mechanism to essentially equalize
expression of sex-linked genes in males and females is
a. doubling the gene expression for most genes on the X chromosome in males. b. doubling the number of X chromosomes in males early in embryonic development in all cells except for precursors of sex cells. c. having all major genes on the X chromosome also present on the Y chromosome. d. halving the gene expression for most genes on each X chromosome in females. e. inactivation of one of the two X chromosomes in most body cells of females.
The structural organization of muscle fibers makes it possible to produce contractile force
a. What is the fundamental contractile unit of skeletal muscle? b. What are the names of the bands, lines and zone of the contractile unit of skeletal muscle? c. Each of the contractile unit region names in (b) contains a letter. What does each of these letters stand for? d. What changes occur in the contractile unit regions during contraction? What will be an ideal response?
The style and the stigma are both parts of the
A. stamen. B. ovary. C. seed. D. pistil.
Which of the following would send a signal to the central nervous system that you had touched a hot object?
A) interneuron B) sensory neuron C) motor neuron D) glial cell