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water moves via the transportation stream, pulling it up through the xylem in the stem of the plant
There are four DNA bases, Adenine (A), Cytosine (C), Guanine (G) and Thymine (T). On each strand of DNA, the DNA bases are connected by phosphodiester bonds, to form a long chain.These long D...
The sperm cell is adapted to its function in multiple ways:It has a tail which enables it to swim towards the egg.The middle section of the cell is packed with mitochondria. This allows it to release the ...
Mark 1: What is a vaccine?A vaccine contains antigens from an inactive form of a specific pathogen.Mark 2: Which cells are first to respond to the antigen?Anti...
5 of the following...Pathogen has antigens on its surface that are recognised as foreign by the immune systemT helper cells stimulate cytotoxic T cells, B cells and phagocytes (or lysosomes)Answered by Harriett F. • Biology tutor2016 Views
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