Answer:
This question lacks options, options are:
a) indirect
b) mosaic
c) determinative
d) regulative
e) direct.
The correct answer is d.
Explanation:
The egg (ovum) like the embryo during the first embryonic divisions, do not possess any sign of polarity. This development mechanism can be called regulative development(in contrast to the mosaic model) since the fate of the cells that originate is not fixed and can be modified during development. In regulative embryos, part of the embryo can be removed and the remaining cells can compensate for the loss and give a complete individual as the final product.The strongest evidence that continues to support this regulatory model is based on the plasticity or potential that mammalian cells possess before implantation. It is known that the blastomeres produced by the first divisions can be replaced with each other or even can be eliminated without apparently altering the embryonic development and therefore they are equivalent (without polarity).
The correct answer is: Free ribosomes are located in the cytoplasm, whereas attached ribosomes are embedded on the endoplasmic reticulum.
<span>Free ribosomes produce proteins which are released into the cytosol and used within the cell. On the other hand, attached (membrane-bound) ribosomes synthesize proteins that are needed within the plasma membrane or are released from the cell. The newly synthesized polypeptide chains are inserted directly into the endoplasmic reticulum by the attached ribosome and are then transported to their destinations where they will be secreted. </span>
<span>Somatic is to autonomic as voluntary is to involuntary.
The autonomic nervous system or visceral nervous system (also called vegetative nervous system) is the part of the nervous system responsible for functions not subject to voluntary control (like heart rate, breath...).
The somatic nervous system is the part of the peripheral nervous system that controls the movements and position of the body and allows to perceive through the skin various sensations (touch, heat, pain) and discover through the other sense organs the surrounding environment (like vision, hearing, olfaction...).
Both of the nervous systems consists of sensory neurons and motor neurons.
About rest and excitation, they are controlled by the two parts of the autonomic nervous system (sympathetic an parasympathetic).</span>
