The 'Urey-Miller experiment' synthesized which organic molecules?
A. Lipids
B. Amino acids
C. DNA
D. Proteins
Answer: Option B
Solution (By JKSSB Mock Tests)
Stanley Miller and Harold Urey simulated early Earth conditions and obtained amino acids (like glycine and alanine) by applying electric discharge to a mixture of gases.
Explanation:
Hemoglobin is a red, iron-containing protein in red blood cells (erythrocytes) that reversibly binds oxygen to form oxyhemoglobin. Each molecule has four heme groups, each binding one O₂ molecule. Hemocyanin (copper-based) is found in some invertebrates. Myoglobin stores oxygen in muscles. Cytochromes are electron carriers in respiration. Hemoglobin also transports CO₂ as carbaminohemoglobin.
Explanation:
Leprosy (Hansen's disease) is a chronic bacterial infection caused by Mycobacterium leprae, affecting skin, peripheral nerves, and mucous membranes. Tuberculosis is caused by M. tuberculosis. Diphtheria is Corynebacterium diphtheriae, plague is Yersinia pestis. Leprosy is curable with multidrug therapy.
Explanation:
The law of independent assortment states that alleles of different genes segregate independently of each other during gamete formation, provided the genes are on different non-homologous chromosomes. If genes are linked (on the same chromosome), they tend to be inherited together unless crossing over occurs. This law was derived from Mendel's dihybrid crosses, yielding the 9:3:3:1 ratio.
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