Genetic information stored in mRNA is translated to polypeptide by?
A.
Ribosome
B.
Nucleus
C.
Endoplasmic reticulum
D.
Golgi apparatus
Answer: Option A
Explanation:
Ribosomes are ribonucleoproteins which are made up of RNAs and protein. These are used to translate genetic information stored in mRNA to polypeptides. These are globular in structure.
Which of the following ribosomal RNA does not take part in rDNA organization of E.coli?
A.
5S RNA
B.
23S RNA
C.
16S RNA
D.
5.8S RNA
Answer: Option D
Explanation:
The transcription unit of prokaryotes is made up of three ribosomal RNAs i.e. 16S, 23S, and 5S. The organization of ribosomal RNAs is similar in eukaryotes also but the size of RNA varies.
What is the sedimentation coefficient of mitochondrial ribosome of humans?
A.
70S
B.
55S
C.
80S
D.
60S
Answer: Option B
Explanation:
Eukaryotes consists of two types of the ribosome, cytosolic and organellar. The cytosolic ribosome is of 80S while organellar ribosome of mitochondria and chloroplast is smaller in size than cytosolic ribosome and bear resemblance to bacterial ribosome.
Which of the following is not a sorting signal present of protein?
A.
Signal patch
B.
Signal peptide
C.
Carbohydrate sequence
D.
Amino acid sequence
Answer: Option C
Explanation:
Sorting signals present on proteins help them to transport and target to specific organelles such as ER, mitochondria, nucleus, plastids etc. Sorting signals present on protein can be a signal patch or signal peptide which is in the form of an amino acid sequence.