Answer:
Carrier proteins undergo a shape change as they move substances across the membrane, while channel proteins do not. Channel proteins move substances across the membrane at a much faster rate than carrier proteins. Carrier proteins can allow much larger substances to cross the membrane than channel proteins do.
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The structural feature of a spermatozoon containing mitochondria arranged in a spiral around the microtubules is the sperm neck. The spermatozoon functions to carry genetic material from the body of a male. It consists of two major parts which are the head and the tail. It is in the tail that the neck is found. This part is a constricted and a short segment. At least two mitochondria can be found in this portion.
There are the eight phases of Meiosis which are as follows:
Prophase I, Metaphase I, Anaphase I, Telophase I and Cytokinesis, Prophase II, Metaphase II, Anaphase II, Telophase II and cytokinesis.
