Answer: True
Explanation: A vector is used to take up foreign DNA into host cell. They are used in recombinant DNA technology (for cloning) because they replicate at a high rate, have antibiotic resistant gene and genetic markers that are used for recognition. Most commonly used vectors are E.coli and smaller circular DNA.
If a neuron is exposed to tetrodotoxin ,sodium ions will be unable to cause the action potential,therefore being blocked from passing any impulses or receiving them...
A protein molecule is made from a long chain of these amino acids, each linked to its neighbor through a covalent peptide bond (Figure 3-1). Proteins are therefore also known as polypeptides. Each type of protein has a unique sequence of amino acids, exactly the same from one molecule to the next.