At a specific area of a chromosome, the sequence of nucleotides below is present where the chain opens to form a replication fork: 3' c c t a g g c t g c a a t c c 5' an rna primer is formed starting at the underlined t (t) of the template. which of the following represents the primer sequence? a) 5' g c c t a g g 3' b) 3' g c c t a g g 5' c) 5' a c g t t a g g 3' d) 5' a c g u u a g g 3' e) 5' g c c u a g g 3

The sequence of the primer for this open chain DNA replication fork is 5'ACGUUAGG3' Option D.

Explanation:

During the S phase of the mitotic division prior to cell multiplication, there is need to double the genetic make up of thr organism so as to maintain a conservation of the DNA. Replication start from the formation of primer at the replication fork of the genome, a primer is a short sequence RNA strand, which is needed to enable DNA polymerase to add DNA molecules using the parent strand. DNA replication including primer formation proceed by reading from the 3' to the 5' end, starting at a point where there is free hydroxyl group. This replication origin also start at the T and A rich region because it is easy to hydrolyse the double bounded molecules than the G and C rich.

Starting from the eight code with T, underlined, the complementary sequence that will be produced by the primase enzyme will be 5'ACGUUAGG3' which is option D, it should be noted that this sequence start from 5' and end in 3', and the sequence should not have T, since it's a RNA.

c. earths continental crust is thicker than its lithosphere.

because, the lithosphere is the outermost layer of the earth/ 100 km thick and is defined by its machanical properties.the lithosphere contains oceanic and continental crust that varies in age and thickness across locations and geologic time. the lithosphere is the coolest layer of the earth in terms of temperature. the term lithosphere should not be confused with the use of "geosphere" which is used to indicate all of earth systems, including the atmosphere, hydrosphere   and biosphere. the surface of the earth can be divided into the continental crust and the oceanic crust.   the continental crust is made mostly of granite while the oceanic crust is made of basalt. the average thickness of the continental crust is 25 miles and the average thickness of the oceanic crust is 5 miles.   three types of rock, igneous, sedimentary, and metamorphic, make up the surface of the earth. that's why 3 option is preferable.