<span>c. Metaphase
</span><span>The two identical daughter cells resulting from mitosis and cytokinesis are identical in the following ways:1. Mitosis occurs when the nucleus of the cell divides into two identical nuclei, each with the same type and number of chromosomes. The cell's DNA is duplicated during this phase. Sometimes the cell's DNA isn't copied properly resulting in cancer-type cells. 2. Cytokinesis is when the cytoplasm divides into two identical daughter cells. Each cell is genetically identical and both are a similar size. </span>
The designation Rr for a pea-plant's peas shows that the plant is a <u>true-breeding plant</u>.
Question:All known organisms use genetic information to produce protein molecules via the same genetic code. This finding strongly supports the hypothesis that __________.
a) the earliest macromolecules probably arose when lightning struck an oxygen-free atmosphere
b) all organisms are descended from one or a few common ancestors
c) the genetic code readily evolves by natural selection
d) there's only one possible way to encode information in a macromolecule
Answer:
b) all organisms are descended from one or a few common ancestors
Explanation:
Protein synthesis occurs when the nucleotide sequence of the mRNA is read in the form of genetic codes. A specific genetic code specifies the same amino acid in all living beings. For example, the code "UUU" codes for phenylalanine in all the living beings irrespective of their species. This suggests that all the life forms have originated from one or few common ancestors and the genetic code has been preserved during the course of evolution of various species.
Ribosomal RNA<span> (</span>rRNA<span>) associates with a set of </span>proteins<span> to form ribosomes. These complex structures, which physically move along an </span>mRNA<span> molecule, catalyze the assembly of amino acids into </span>protein<span> chains. They also bind </span>tRNAs<span> and various accessory molecules necessary for </span>protein<span> synthesis
</span>The Three Roles of RNA in Protein Synthesis - Molecular Cell Biology ...<span>https://www.ncbi.nlm.nih.gov/books/NBK21603/</span>
