Transcription and Translation

RNA has which sugar instead of deoxyribose?

• ribose sugar

• no sugars

• trioxyribose sugar

• a phosphate backbone

Answer explanation

RNA contains ribose sugar, which differs from DNA that has deoxyribose. This ribose sugar is essential for the structure and function of RNA.

How is DNA different from RNA?

• DNA is single stranded while RNA is double stranded

• RNA is single stranded while DNA is double stranded

• They are exactly the same

• RNA uses thymine while DNA uses uracil

Answer explanation

RNA is single stranded while DNA is double stranded, which is a key structural difference. Additionally, DNA contains thymine, whereas RNA contains uracil, but the main distinction is their strand structure.

Match each nucleotide with the type of nucleic acid it is found in.

• Found only in RNA

• thymine

• Found only in DNA

• uracil

• Found in both DNA and RNA

• adenine and guanine

Which nucleotide is found only in DNA?

• thymine

• uracil

• adenine

• guanine

Answer explanation

Thymine is a nucleotide that is unique to DNA, while uracil is found only in RNA. Adenine and guanine are present in both DNA and RNA. Therefore, thymine is the correct answer.

Transcribed copy of a DNA sequence made to leave the nucleus

• mRNA

• rRNA

• tRNA

• RNA

Answer explanation

mRNA, or messenger RNA, is the transcribed copy of DNA that carries genetic information from the nucleus to the ribosome for protein synthesis, making it the correct answer.

Form ribosomes

• mRNA

• tRNA

• rRNA

• RNA

Answer explanation

Ribosomes are formed from ribosomal RNA (rRNA), which combines with proteins to create the ribosomal structure essential for protein synthesis. mRNA and tRNA play roles in translation, but rRNA is the key component of ribosomes.

rRNA means (a)   .

• ribosomal RNA

• ribose RNA

• replication RNA

• rescue RNA

Answer explanation

rRNA stands for ribosomal RNA, which is a crucial component of ribosomes, the cellular machinery responsible for protein synthesis. The other options do not accurately describe rRNA.

Which molecule carries amino acids to build proteins?

• tRNA

• rRNA

• mRNA

• RNA

Answer explanation

tRNA, or transfer RNA, is the molecule that carries amino acids to the ribosome, where proteins are synthesized. It matches specific amino acids to the corresponding codons on mRNA during translation.

What does tRNA mean?

• transfer RNA

• transcription RNA

• translation RNA

• template RNA

Answer explanation

tRNA stands for transfer RNA, which is crucial in the process of translation. It carries amino acids to the ribosome, where proteins are synthesized, making 'transfer RNA' the correct choice.

DNA is essential because it contains the

• genetic information

• proteins

• ribosomes

• nucleus

Answer explanation

DNA is essential because it contains the genetic information necessary for the development, functioning, and reproduction of all living organisms. The other options, such as proteins and ribosomes, are products or components, not the information itself.

Tags

NGSS.HS-LS3-1