A codon Question 6 options: corresponds to a particular amino acid. consists of four nucleotides. consists of discrete amino acid regions. catalyzes RNA synthesis.

corresponds to a particular amino acid

Explanation:

All living organisms/cells consists of DNA, which encodes or stores genetic information. The DNA is made up of nucleotide bases, whose order determines the order of the nucleotides in the transcript mRNA. The mRNA is read in a group of three nucleotide sequences called CODON. Each codon specifies an amino acid i.e. codes for a specific amino acid in the genetic code.

There are about 64 possible codons made from 4 nucleotides that are read three at a time i.e. 4^3=64.

answer; a male inherits only one allele of the x-linked gene controlling hair color;

cells use diffusion to get substances in and out of themselves. that diffusion will occur across the cell membrane or the outer covering of the cell. because we are talking about the surface of the cell, surface area and volume are  important factors here. as a cell increases in size, its surface area and volume increase as well.  we call that the surface area to volume ratio (sa: vol).  but the catch is that  volume increases at a greater rate than surface  area. in other words, as a cell gets bigger, the sa: vol gets smaller. so a really small cell like bacteria is mostly cell membrane (surface) with very little contents (volume). a really big cell like an egg, is mostly insides with a super thin membrane. so what ends up happening is that the cell cannot efficiently diffuse all of the stuff it needs in/out to survive. therefore cell size is limited to about 100mm. so how do we make organisms bigger than 100mm? cells divide! by dividing and becoming multicellular, organisms are able to grow!   check out the diagrams i attached to see the effect of sa: vol. i hope this ! good luck!