Question

The sequence 5'-CCGTAATCG-3' describes the __________ structure of DNA.

a)Tertiary
b)secondary
c)Quinary
d)Primary
e)Quaternary

Answer 1

The sequence 5'-CCGTAATCG-3' illustrates the primary structure of DNA, representing the nucleotide sequence from 5' to 3', which is analogous to the sequence of amino acids in a polypeptide chain for proteins.

Step-by-step explanation:

The sequence 5'-CCGTAATCG-3' describes the primary structure of DNA. The primary structure is the sequence of nucleotides that carries genetic information and is written from the 5' end to the 3' end, indicating the orientation of the sugar-phosphate backbone of the DNA molecule. In proteins, the primary structure refers to the sequence of amino acids in a polypeptide chain.

The secondary structure of DNA refers to the familiar double helix shape that results from hydrogen bonding between complementary bases. For proteins, secondary structure includes configurations like α-helices and β-pleated sheets. The tertiary structure refers to the overall three-dimensional shape that is important for protein function and can be stabilized by a variety of bonds and interactions between R groups.

Finally, the quaternary structure occurs when two or more protein subunits come together to form a functional complex. Thus, the correct answer to the question is that the sequence describes the primary structure of DNA.

Answer 2

The sequence 5'-CCGTAATCG-3' describes the b) secondary structure of DNA.

Step-by-step explanation:

The b)secondary structure of DNA refers to the local folding patterns within the DNA molecule. In this context, the sequence 5'-CCGTAATCG-3' describes the specific base-pairing interactions between complementary nucleotide bases.

Adenine (A) pairs with thymine (T) through two hydrogen bonds, and cytosine (C) pairs with guanine (G) through three hydrogen bonds. The given sequence allows us to identify the complementary base pairs, illustrating the secondary structure of DNA.

Understanding the secondary structure is crucial for comprehending the overall three-dimensional structure of the DNA molecule. While the sequence provided does not give information about the helical twist or overall spatial arrangement of the DNA, it does reveal how individual nucleotides pair with each other along the strand. This knowledge is fundamental for various biological processes, including DNA replication and transcription.

In summary, the secondary structure of DNA involves the specific pairing of complementary bases, forming the classic double-helix structure. The given sequence, 5'-CCGTAATCG-3', helps elucidate these base-pairing interactions, offering insight into the secondary structural features of the DNA molecule.