Enzymes are specialized proteins that speed up chemical reactions, biological catalyst.
The right answer is 4).
The cytoskeleton is made up of biological polymers of proteins, sometimes called fibers because of their large size at the cellular level. They are classified into three categories:
Microfilaments: involves in cytoplasmic phenomena (division, endocytosis, migration).
Intermediate filaments: Maintenance of the nucleus structure.
Microtubules: Involved in the separation of chromosomes during mitosis.
They are most likely found there because most organisms like to settle near a water source for easily accessible water.
Answer:
B
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To kill a foreign object, the white blood cells need to recognize the object by looking at their cell receptor. If the virus changes its receptor, it won't be recognized by the white blood cells. The immune system cant fight the infection if they don't learn to recognize the new form of the virus. This makes the virus hard to fight
