The principal role of is to act as a messenger carrying instructions from DNA out of the nucleus for the synthesis of proteins. A serves as the site of protein synthesis in the cytoplasm. is the first step of gene expression, during which a particular segment of DNA is converted into RNA. A is made up of hundreds or thousands of smaller units called amino acids, attached to one another in long chains. is a long linear polymer found in the nucleus of a cell, shaped like a double helix, and associated with the transmission of genetic information. is the process in which mRNA codons are converted into an amino acid sequence.

did u get the answer? /? ? / me

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:

i'm guessing this is from edg enuity so the answers would be, from top to bottom,

theodor schwann

matthias schleiden

robert hooke

rudolph virchow

anton van leeuwenhoek