Tyra created a chart that compared DNA and RNA for her science class.
Tyra made a mistake while she was creating her chart. Which best identifies the mistake Tyra made?
a
DNA remains in the nucleus while RNA leaves the nucleus.
b
DNA has bases of A, G, C, and U while RNA has bases of A, G, C, and T.
c
DNA is single-stranded while RNA is double-stranded.
d
DNA contains a ribose sugar while RNA contains a deoxyribose sugar.
To identify the mistake Tyra made while creating her chart, we need to compare the characteristics of DNA and RNA. Let's analyze each option and determine which characteristic is incorrect.
a) DNA remains in the nucleus while RNA leaves the nucleus.
This statement is correct. DNA is typically located within the nucleus of a cell, while RNA often leaves the nucleus to perform its functions. Therefore, option a is not the mistake Tyra made.
b) DNA has bases of A, G, C, and U while RNA has bases of A, G, C, and T.
This statement is incorrect. DNA consists of the bases adenine (A), guanine (G), cytosine (C), and thymine (T), whereas RNA has the same bases, except for thymine which is replaced by uracil (U). Therefore, option b indicates the mistake Tyra made, as she incorrectly stated that RNA has bases of A, G, C, and T.
c) DNA is single-stranded while RNA is double-stranded.
This statement is incorrect. DNA is usually double-stranded, consisting of two complementary strands. RNA, on the other hand, is typically single-stranded. Therefore, option c is not the mistake Tyra made.
d) DNA contains a ribose sugar while RNA contains a deoxyribose sugar.
This statement is incorrect. DNA contains a sugar called deoxyribose, while RNA contains a sugar called ribose. Therefore, option d indicates the mistake Tyra made, as she erroneously stated that DNA contains a ribose sugar while RNA contains a deoxyribose sugar.
In conclusion, the correct answer is option b. Tyra's mistake was stating that RNA has bases of A, G, C, and T instead of the correct bases of A, G, C, and U.