#1
What is the basic unit of life?
Cell
ExplanationCells are the fundamental structural and functional units of all living organisms.
#2
What is the primary function of enzymes in living organisms?
Catalyzing chemical reactions
ExplanationEnzymes facilitate and accelerate chemical reactions in living organisms by serving as catalysts.
#3
What is the role of chlorophyll in plants?
Convert sunlight into energy
ExplanationChlorophyll is the pigment in plants that captures sunlight and converts it into chemical energy through photosynthesis.
#4
What is the main function of the endocrine system in the human body?
Controlling hormone secretion
ExplanationThe endocrine system regulates various physiological processes by secreting hormones into the bloodstream.
#5
What is the primary function of the nervous system in the human body?
Controlling body movements
ExplanationThe nervous system coordinates and controls body movements and responses to stimuli through the transmission of nerve signals.
#6
Which scientist is credited with the discovery of the structure of DNA?
Francis Crick
ExplanationFrancis Crick, along with James Watson, is known for the discovery of the double helix structure of DNA.
#7
What is the process by which cells divide and produce identical daughter cells?
Mitosis
ExplanationMitosis is the cellular process of division, resulting in two identical daughter cells with the same number of chromosomes.
#8
Which of the following is a greenhouse gas responsible for global warming?
Methane
ExplanationMethane is a potent greenhouse gas contributing to global warming and climate change.
#9
What is the function of the circulatory system in the human body?
Transporting blood and nutrients
ExplanationThe circulatory system is responsible for transporting blood, oxygen, and nutrients throughout the body.
#10
Which organelle is known as the 'powerhouse of the cell'?
Mitochondria
ExplanationMitochondria are often called the 'powerhouse of the cell' as they are responsible for energy production through cellular respiration.
#11
What is the primary function of the respiratory system in the human body?
Exchange of gases
ExplanationThe respiratory system facilitates the exchange of oxygen and carbon dioxide, supporting cellular respiration.
#12
Which of the following is NOT a characteristic of living organisms?
Inanimate
ExplanationLiving organisms are characterized by attributes such as growth, reproduction, and responsiveness to stimuli, unlike inanimate objects.
#13
What is the central dogma of molecular biology?
Protein synthesis
ExplanationThe central dogma states the flow of genetic information from DNA to RNA to protein synthesis.
#14
Which scientist proposed the theory of evolution by natural selection?
Charles Darwin
ExplanationCharles Darwin proposed the theory of evolution by natural selection, explaining the process of gradual changes in species over time.
#15
In genetics, what is the typical representation of a dominant allele?
Uppercase letter
ExplanationDominant alleles are often represented by uppercase letters in genetics, indicating their dominance over recessive alleles.
#16
Which of the following is a key characteristic of prokaryotic cells?
No membrane-bound nucleus
ExplanationProkaryotic cells lack a membrane-bound nucleus, distinguishing them from eukaryotic cells.
#17
What is the role of RNA in protein synthesis?
Acting as a template for protein formation
ExplanationRNA serves as a template in protein synthesis, carrying genetic information from DNA to facilitate the building of proteins.