Ionic and covalent bonds are intramolecular bonds, meaning that they exist inside the molecule. These bonds deal with the exchange of electrons.
Hydrogen bonds are intermolecular bonds, meaning they bond two separate molecules. These bonds deal with the attraction between hydrogen and electronegative elements such as O and F.
Covalent bond: bond in which one or more pairs of electrons are shared by two atoms. Ionic bond: bond in which one or more electrons from one atom are removed and attached to another atom, resulting in positive and negative ions which attract each other. Other types of bonds include metallic bonds and hydrogen bonding.
Ionic vs covalent
Ionic bonds form between a metal and a non-metal. In these bonds, the electrons from the metal are donated to the non-metal.
Covalent bonds form between two non-metals. In these bonds, electrons are shared between the two atoms.
Answer:
a-B
b-N
c-BT
d-BT
e-BT
Explanation:
a. epitopes may consist of non-sequential amino acids ---------> B (is only true for epitopes for BCRs)
b. epitopes are often from the interior of an antigen -------------> N (IS ONLY TRUE FOR EPITOPES FOR TCR)
c. epitopes can be present in immunogens ------------------> BT (True for both TCR and BCRs )
d. epitope binding to the antigen receptor obeys the 12/23 rule -------------> BT (True for both TCR and BCRs )
e. multiple identical epitopes may be present in a single antigen --------------> BT (True for both TCR and BCRs )
Answer:
False
Explanation:
They are identical. It happens during the anaphase. Then during telephase a nuclear membrane will form around each set of chromosomes to separate the nuclear DNA from the cytoplasm.
Answer:
Messenger RNA (mRNA) molecules carry the coding sequences for protein synthesis and are called transcripts; ribosomal RNA (rRNA) molecules form the core of a cell's ribosomes (the structures in which protein synthesis takes place); and transfer RNA (tRNA) molecules carry amino acids to the ribosomes during protein.
Explanation:
Messenger and transfer RNA
