531. It is possible to date the rocks by comparing the amount of specific radioactive isotopes they contain. Which of the statements is correct in this respect:
A. Older sediment layers have an equal amount of these radioactive isotopes as that of the young ones
B. Older sediment layers have less amount of these radioactive isotopes as that of the young ones.
(C. Older sediment layers have a greater amount of these radioactive isotopes as that of the young ones.)
D. Older sediment layers did not have these radioactive isotopes
532. Reverse transcriptase is present in:
A. All RNA viruses
B. All DNA viruses
(C. All retroviruses)
D. All viruses
533. A large regional community primarily determined by climate is called:
A. Population
B. Community
(C. Biome)
D. Habitat
534. Branch of biology that deals with the study of chemical components and chemical processes in living organisms is called:
(A. Molecular biology)
B. Physiology
C. Biochemistry
D. Atomic biology
535. A structure formed by groups of similar cells organized into loose sheets or bundles performing similar functions is called:
A. An organ
B. An organism
(C. A Tissue)
D. A Cell
536. Oxygen accounts for __ percent of the total human body mass:
A. 65%
B. 18%
C. 10%
(D. 3%)
537. Out of the total organisms on earth, _ are vascular plants?
A. 53.10%
B. 19.90%
(C. 17.60%)
D. 9.40%
538. Breakdown of large molecules into smaller ones utilizing water molecules is_________?
A. Hydration
B. Hydrolysis
(C. Dehydration synthesis)
D. Electrolysis
539. Intake of liquid material by the cell membrane is called___________?
A. Endocytosis
B. Exocytosis
(C. Phagocytosis)
D. Pinocytosis
540. Which one is not correct for a productive theory?
A. It is predictive
B. It has explanatory power
(C. It discourages the suggestion of different hypotheses)
D. None of these
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