A biologist <span>an expert in or student of the branch of science concerning living organisms</span>
Proto-oncogenes signal cells to grow and differentiate. However, they can become oncogenes due to mutations which result in the uncontrollable division of the cells, i.e. cancer. One way is a point mutation in a proto-oncogene. The consequence is changed protein product. Another way is gene amplification of DNA segment containing a proto-oncogene. As the result, the encoded protein is overexpressed. The third way is translocation. As the result of translocation, proto-oncogene can be controlled by the different promoter and expressed inappropriately.
Meiosis I halves the number of chromosomes and is also when crossing over happens<span>. Meiosis II halves the amount of </span>genetic information<span> in each chromosome of each </span>cell<span>. ... Just like in mitosis, the parent </span>cell<span> uses this time to prepare for </span>cell<span> division by gathering nutrients and energy and making a copy of its DNA.</span>
The statement '<span>Hormones are chemical secreted and regulate by the endocrine system.' is indeed TRUE. The endocrine system is responsible for secreting bodily juices that would excite or inhibit the sympathetic and/or parasympathetic systems in the body.</span>
