551. The basic structural unit of a chromosome is____________?
A. The centromere
B. Nuceleosome
C. Telomere
D. Histone

552. In living organisms the lubricant which provides protection against damage resulting from friction is___________?
A. Carbohydrates
B. Fatty acid
C. Water
D. Protein

553. The first stage of development in which a cavity appears is the__________?
A. Neurula
B. Morula
C. Gastrula
D. Balastula

554. The trioses which are intermediate in respiration and photosynthesis are_______________?
A. Glyceraldehydes
B. Dihydroxy acetone
C. Both of these
D. None of these

555. The monosaccharide found in some bacteria and occurring rarely are______________?
A. Trioses
B. Hexoses
C. Tetroses
D. Pentoses

556. The one which causes contraction of wall of the uterus during and after birth?
A. ADH
B. MSH
C. Oxytocin
D. Progesterone

557. Which statement correctly describes the transcription of DNA?
A. It produces another DNA molecule
B. It produces mRNA
C. It is a semi conservation process
D. It occurs at surface of ribosomes

558. Triglyceride is also known as_____________?
A. Natural lipid
B. Neutral lipid
C. Neutral wax
D. All of these

559. Carbon commonly combines with______________?
A. H
B. N & O
C. P & S
D. All of these

560. The sequence of 3 bases on tRNA which is complementary to condon of mRNA is called____________?
A. Gene
B. Anticodon
C. Code
D. Codon

NOTE
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