The enzyme that converts lactose into glucose and galactose is:
A. Sucrase
B. Maltase
C. Amylase
D. Lactase
Answer: Option D
Solution (By JKExamLibrary)
Lactase is a brush border enzyme in the small intestine that hydrolyzes lactose (milk sugar) into its constituent monosaccharides. Maltase acts on maltose, sucrase on sucrose, amylase on starch. Lactose intolerance results from lactase deficiency.
Explanation:
The diaphragm is a dome-shaped skeletal muscle that contracts during inspiration, flattening and increasing thoracic volume. The external intercostal muscles assist.
Explanation:
AB positive blood has A and B antigens on RBCs and lacks anti-A and anti-B antibodies, so it can receive blood from any ABO group without agglutination.
Explanation:
The poly-A tail is a long chain of adenine nucleotides (typically 100-250) added to the 3' end of a pre-mRNA molecule during post-transcriptional processing in the nucleus. Its primary functions are to protect the mRNA molecule from enzymatic degradation in the cytoplasm (by exonucleases), to facilitate the export of the mature mRNA from the nucleus to the cytoplasm, and to promote translation by helping to recruit ribosomes. It also plays a role in determining the lifespan of the mRNA in the cytoplasm.
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