In human chromosomes, satellite DNA sequences of about 170 base pairs in length are present in tandem arrays of up to 1 million base pairs. Found mainly in centromere regions, these DNA sequences are called .

The correct answer to fill in the blank is: Alphoid families.

Explanation:

Alphoid repetitive DNA is found in the centromeres. This satellite DNA constitutes an important portion of heterochromatin and consists of a large array of non-coding DNA that repeats tandemly (meaning that one gene is duplicated and can be found adjacent to the original copy).

Non-coding DNAs are DNA sequences that do not encode for any proteins.

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hey, i believe your answer would be d. sugar ribose and the base uracil. i believe this is the answer, because rna consists of sugar ribose, adenine, guanine, cytosine, and uracil.

your first option is incorrect, because that's dna. where it consists of sugar deoxyribose, adenine, guanine, cytosine and thymine.

your second option is also incorrect, this is because sugar deoxyribose is in dna, and uracil is in rna. these two do not make sense together.

your third option being incorrect, because sugar ribose is in rna, but not the base of thymine. rna consists of uracil, not thymine.

lastly your fourth option being correct! this answer is correct, because both sugar ribose, and the base uracil are in rna! ~

answer is d. sugar ribose and the base uracil.