The Sox2 protein is an early marker of neural tissue. Imagine a researcher removes a region of cells from an area of a gastrulating embryo he believes to be neural-specified, and places them in neutral culture medium; however, he doesn't observe any Sox2 expression after several days, and the cells do not take on a neuron-like appearance. What could be an explanation for this?

the Sox2 protein is a prime factor of making neutral tissues and has an important role in, initiating neural induction and maintaining neural progenitor stem cell properties throughout neural differentiation.  

a researcher removed a group of cells believing that it was the neural specified area and placed them in a neutral culture medium. he did not observe and those cells did not appear as a neuron-like appearance because--

The removed cells needed to be exposed to a variety of "non-neural" proteins to demonstrate neural specification.

it was left unattended and non-neural proteins were also not been provided to that culture.

d concave shape of wave rock

explanation:

the concave shape of wave rock is a very good evidence that supports the evolution of earth due to chemical weathering. if we talk about structure of   wave rock, studies have estimated that it is around 2.7 billion years old. it also serves as the foundation of evidence that it was the place where australian continent began to form.

how the structure of wave rock was created?

studies suggest that structure of wave rock was created when the surrounded area was started to weather due to which deposition of material started on the part of land which now contains wave rock.

the structure of wave rock is considered to be one of the best-known landforms in australia. at the height of around 15 cm, there can be found flared slopes which formulate the margins of hyden rock. it is now assumed by geologists that wave rock was created by subsurface water-induced weathering and not by glaciers, waves or wind.

due to deposition of material over the period of long time, the wave rock became tougher and tougher due to weathering from surrounding terrain. this makes it a physical evidence that supports   the evolution of earth due to chemical weathering.

hope it !