Introns contain useful information

A. that will be translated exons contain useful information
B. that will be translated introns contain useful information
C. that will be transcribed exons contain useful information
D. that will be transcribed exons and introns contain useful information
E. that will be translated

C) is the correct option

Explanation:

Splicing is the post transcriptional modification of pre mRNA which occurs in nucleus just after transcription but before the RNA moves to the cytoplasm

In RNA splicing non coding regions of pre mRNA called introns are removed and coding regions called exons are religated

Removal of every intron require two transesterification reaction:

First transesterification reaction displaces exon from intron with 3' OH group

Second transesterification reaction always catalysed by 3'OH group of displaced exon at 3'splice site

C

Explanation:

Gene contains exons and introns. Both  exons as well as are transcribed into pre-mRNA by transcription. But through  RNA splicing, all the  introns are removed from the pre-mRNA in the form of a lariat, and exons are joined together to form a mRNA.  

RNA Splicing: it  is the process of removal of introns  from the pre-mRNA and addition of exons to form a mature mRNA. It  may produce various type of mRNA form a single gene by alternative splicing.

Finally the mature mRNA is translated into protein.

Mantle convection  is the slow  creepingmotion of earth's solid silicate  mantle  caused by  convection  currents carrying  heat from the interior  to the planet's surface.[1][2]  the earth's surface  lithosphere, which rides atop the  asthenosphere  (the two components of the  upper mantle), is divided into a number of  plates  that are continuously being created and consumed at their opposite  plate boundaries. accretion occurs as mantle is added to the growing edges of a plate, associated with  seafloor spreading. this hot added material cools down by  conduction  and  convection  of heat. at the consumption edges of the plate, the material has thermally contracted to become dense, and it sinks under its own weight in the process of  subduction  usually at an  ocean trench.[3]this subducted material sinks through the earth's interior. some subducted material appears to reach the lower mantle,[4]  while in other regions, this material is impeded from sinking further, possibly due to a phase transition from  spinel  to  silicate perovskiteand  magnesiowustite, an  endothermic reaction.[5]the subducted oceanic crust triggers  volcanism, although the basic mechanisms are varied. volcanism may occur due to processes that add buoyancy to partially melted mantle causing an upward flow due to a decrease in density of the partial melt.secondary forms of convection that may result in surface volcanism are postulated to occur as a consequence of intraplate extension[6]  and  mantle plumes.[7]it is because the mantle can convect that the  tectonic plates  are able to move around the earth's surface.[8]mantle convection seems to have been much more active during the  hadean  period, resulting in gravitational sorting of heavier molten  iron, and  nickel  elements and  sulphides  in the core, and lighter  silicate minerals  in the  mantle.

passive transport is a movement of biochemicals and other atomic or molecular substances across cell membranes without need of energy input. unlike active transport, it does not require an input of cellular energy because it is instead driven by the tendency of the system to grow in entropy.

~wikipedia

so, according to what that says, i believe it's hypertonic and hypotonic.

good luck!