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【多选题】
What is the physiological role of retinoid hormones ?A.
The retinoid hormones are potent hormones that regulate the growth, survival, and differentiation of cells via nuclear retinoid receptors. The prohormone retinol is synthesized from β-carotene, primarily in liver, and many tissues convert retinol to the hormone retinoic acid (RA).
B.
RA binds its specific receptor (RAR) in the nucleus, forms a dimer with another nuclear protein, retinoid X receptor (RXR), and alters the rate of expression of genes responsive to R
C.
All tissues are retinoid targets, as all cell types have at least one form of nuclear retinoid receptor. In adults, the most significant targets include cornea, skin, epithelia of the lungs and trachea, and the immune system, all of which undergo constant replacement of cells.
D.
RA regulates the synthesis of proteins essential for growth or differentiation. Excessive vitamin A (the precursor to retinoid hormones) can cause birth defects, and pregnant women are advised not to use the retinoid creams that have been developed for treatment of severe acne.
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A.
当温度升高时，液体的粘度增大，气体的粘度减小
B.
当温度升高时，液体的粘度增大，气体的粘度增大
C.
当温度升高时，液体的粘度减小，气体的粘度增大
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A.
它是人类社会赖以存在的物质基础
B.
它决定着社会形态的更替
C.
它制约着整个社会生活过程
D.
它是人类其他一切活动的首要前提
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【简答题】列举3例快速检测种子生活力的方法，简述其原理。
【简答题】正式列入国际种子检验规程和我国农作物种子检验规程的种子生活力的生化测定方法为___________
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