3 What is the role of restriction enzymes in studying the human genome?
A copying pieces of DNA
B labeling different nucleotides with different colors of dyes
separating different pieces of DNA based on their size
D cutting large DNA molecules into smaller pieces

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Explanation:

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thrombocytopenia, which is a deficiency in blood platelets, can cause bleeding and bruising in the dermis similar to senile purpura. other possible causes include: exposure to ultraviolet rays and aging skin are common causes of senile purpura. senile purpura may also be a sign of collagen loss in the skin and bones.