The organelle that contains ribosomes attached to its surface is:
A. Rough ER
B. Smooth ER
C. Lysosome
D. Golgi apparatus
Answer: Option A
Solution (By JKExamLibrary)
Rough endoplasmic reticulum is studded with ribosomes on its cytoplasmic surface, giving it a rough appearance. It is involved in protein synthesis and processing. Smooth ER lacks ribosomes and is for lipid synthesis.
Explanation:
Hemophilia A and B are X-linked recessive disorders caused by mutations in genes for clotting factor VIII or IX on the X chromosome. It predominantly affects males, while females are usually carriers. Down syndrome is an autosomal aneuploidy, cystic fibrosis and sickle cell anemia are autosomal recessive. X-linked disorders follow a characteristic pattern of inheritance.
Explanation:
Malaria is transmitted by Anopheles mosquito; P. falciparum causes severe, often fatal malaria. Amoebic dysentery is Entamoeba, sleeping sickness Trypanosoma, giardiasis Giardia.
Explanation:
RNA polymerase recognizes and binds to the promoter region of DNA, which is located upstream of the coding sequence. This initiates transcription. The terminator signals the end of transcription. Start codon (AUG) is on mRNA where translation begins. Enhancers are regulatory DNA sequences that increase transcription but are not the primary binding site for polymerase.
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