Uracil replaces thymine in RNA. In DNA, thymine pairs with adenine; in RNA, uracil pairs with adenine. Adenine, guanine, and cytosine are present in both. The presence of uracil and the sugar ribose (vs. deoxyribose) are key structural differences between RNA and DNA.
Explanation:
Osmosis is the net diffusion of water through a selectively permeable membrane from a region of low solute (high water potential) to high solute (low water potential).
Consider the following statements about the human heart:
1. The right atrium receives blood from the vena cavae.
2. The left ventricle pumps blood to the lungs.
3. The septum separates the left and right sides.
Which of the above is/are correct?
Explanation:
The right atrium receives deoxygenated blood; the left ventricle pumps to the body (not lungs). Septum divides the heart. So 2 is incorrect.
Explanation:
Diphtheria is a highly contagious bacterial infection caused by Corynebacterium diphtheriae. It primarily affects the mucous membranes of the nose and throat, producing a thick gray pseudomembrane. The bacteria also produce a potent exotoxin that can damage the heart, kidneys, and nervous system. It is preventable by the DPT vaccine.
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