The rDNA cluster is transcribed in a special region of the nucleus. What is this structure called and what is its morphology?
What will be an ideal response?
Ans: rDNA is found within the nucleus in a structure called the nucleolus. Under an electron microscope, the nucleolus has a dark fibrillar core containing the clusters of rDNA undergoing intense transcription, surrounded by a granular cortex containing rRNA that is packaged by proteins.
You might also like to view...
A tumor is actively producing both VEGF and FGF, factors associated with angiogenesis. However, no network of blood vessels to the tumor has been established in spite of the fact that blood vessels are nearby. This observation most likely suggests that
A) the VEGF and FGF are not functional. B) angiogenesis inhibitors are in greater concentration. C) only one of the molecules is active, not both. D) angiostatin is not produced by the cancer cells. E) the tumor is metastatic.
Gravity-sensing mechanisms of many organisms are based on ____
a. spicules b. statoliths c. uric acid crystals d. sclereids
e. nematocystsMature communities generally exhibit the greatest species diversity
Indicate whether the statement is true or false
Albinism, lack of pigmentation in humans, results from an autosomal recessive gene. Two parents with normal pigmentation have an albino child. What is the probability that their next child will be albino?
A) 1/3 B) 1/2 C) 1/16 D) 1/4 E) 3/4