On a strand of the mrna the bases are read in groups of three. what is the correct term for a group of three bases on the strand of mrna? a. chloroplast b. codon c. chromosome d. nucleus

B (CODON)

Explanation:

The DNA, which is the genetic material of most cells holds information that needs to be expressed. The manner in which this information is expressed is known as the GENETIC CODE. Expression follows two main processes; transcription and translation. Transcription involves making a complementary strand of mRNA from the DNA template.

The mRNA is further involved in the translation process where it is read in a group of triplet nucleotides called CODON. Each codon specifies a particular amino acid. There are 64 possible codons got from the 4 nucleotides read three at a time i.e. 4^3. The genetic code constitutes all the CODONS that specifies an amino acid.

fertilization, pictured in figure 24.23a is the process in which gametes (an egg and sperm) fuse to form a zygote. the egg and sperm each contain one set of chromosomes. to ensure that the offspring has only one complete diploid set of chromosomes, only one sperm must fuse with one egg. in mammals, the egg is protected by a layer of extracellular matrix consisting mainly of glycoproteins called the zona pellucida. when a sperm binds to the zona pellucida, a series of biochemical events, called the acrosomal reactions, take place. in placental mammals, the acrosome contains digestive enzymes that initiate the degradation of the glycoprotein matrix protecting the egg and allowing the sperm plasma membrane to fuse with the egg plasma membrane, as illustrated in figure 24.23b. the fusion of these two membranes creates an opening through which the sperm nucleus is transferred into the ovum. the nuclear membranes of the egg and sperm break down and the two haploid genomes condense to form a diploid genome.

explanation:

answer:

convection currents in the magma drive plate tectonics. heat generated from the radioactive decay of elements deep in the interior of the earth creates magma (molten rock) in the aesthenosphere. the aesthenosphere (70 ~ 250 km) is part of the mantle, the middle sphere of the earth that extends to 2900 km.