What selectively permeable shell that allows materials into and out of the nucleus?
What selectively permeable shell that allows materials into and out of the nucleus?
Biology –ch. 5
| A | B |
|---|---|
| cell membrane | the structure that encloses the interior of a cell and controls the passage of materials into and out of the cell, selectively permeable; plasma membrane |
| nuclear envelope | the membrane that surrounds the nucleus |
What does polymerase do in RAbies?
A viral-encoded polymerase (L gene) transcribes the genomic strand of rabies RNA into leader RNA and five capped and polyadenylated mRNAs, which are translated into proteins. Translation, which involves the synthesis of the N, P, M, G and L proteins, occurs on free ribosomes in the cytoplasm.
What is the role of mRNA and expressing specialized structures?
Messenger RNA (mRNA) is the molecule that links genes to proteins. Efficient and smooth interactions of the molecules of life allow us humans to function well.
What is the job of the ribosome?
The ribosome is responsible for translating encoded messages from messenger RNA molecules to synthesize proteins from amino acids. The ribosome translates each codon, or set of three nucleotides, of the mRNA template and matches it with the appropriate amino acid in a process called translation.
What can pass through selectively permeable membrane?
The membrane is selectively permeable because substances do not cross it indiscriminately. Some molecules, such as hydrocarbons and oxygen can cross the membrane. Many large molecules (such as glucose and other sugars) cannot. Water can pass through between the lipids.
What is an example of a selectively permeable membrane?
Selectively permeable membranes can be found around a variety of cells and places. The most common example is the phospholipid bilayer cell membrane that surrounds every cell in our bodies. Another example of a selectively permeable membrane is the inner membranes of an egg.
What is the structure of the rabies virus?
The rabies virus is a negative-sense, non-segmented, single-stranded RNA virus measuring approximately 60 nm × 180 nm. It is composed of an internal protein core or nucleocapsid, containing the nucleic acid, and an outer envelope, a lipid-containing bilayer covered with transmembrane glycoprotein spikes (Fig. 61-2).
What is L protein of rabies?
Rabies virus (RABV) and other viruses with single-segment, negative-sense, RNA genomes have a multi-functional polymerase protein (L) that carries out the various reactions required for transcription and replication.
How does mRNA control gene expression?
Specifically, gene expression is controlled on two levels. First, transcription is controlled by limiting the amount of mRNA that is produced from a particular gene. The second level of control is through post-transcriptional events that regulate the translation of mRNA into proteins.
What is mRNA function?
The role of mRNA is to carry protein information from the DNA in a cell’s nucleus to the cell’s cytoplasm (watery interior), where the protein-making machinery reads the mRNA sequence and translates each three-base codon into its corresponding amino acid in a growing protein chain.
What is the job of Golgi apparatus?
A Golgi body, also known as a Golgi apparatus, is a cell organelle that helps process and package proteins and lipid molecules, especially proteins destined to be exported from the cell.
