This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Metabolism of nucleic acids, Subject name: Biochemistry
Y-chromosomes is 
Select and explain. 
A. Metacentric, B. Sub-metacentric, C. Acrocentric, D. Longer than the X-chromosome
C: Acrocentric
Answer: C: Acrocentric 
Explanation: Acrocentric chromosome: A chromosome in which the centromere is located quite near one end of the chromosome.Humans normally have five pairs of acrocentric chromosomes. <a href=" syndrome</a> is caused by an extra acrocentric chromosome (chromosome21).