What is the primary function of the liver in the human body?
Regulation of body temperature
Regulation of blood pressure
Production of hormones
Detoxification and metabolism of nutrients and drugs
Correct answer is D
The liver is a vital organ in the human body with multiple functions, but its primary function is the detoxification and metabolism of nutrients and drugs. The liver plays a crucial role in various metabolic processes. It detoxifies harmful substances, such as drugs and toxins, by breaking them down into less harmful forms that can be eliminated from the body.
Which of the following statements is true regarding the urinary tubule in the excretory system?
The urinary tubule is responsible for the production of urine
The urinary tubule regulates the water and electrolyte balance in the body
The urinary tubule connects the kidneys to the bladder
The urinary tubule is the site of filtration of blood
Correct answer is A
The urinary tubule, a part of the nephron in the kidney, is indeed responsible for the production of urine. It does this by reabsorbing useful substances from the filtrate, such as glucose and ions, and secreting waste products into it. The modified filtrate, now called urine, is then passed on to the bladder for storage and eventual excretion.
Which of the following statements is true regarding cell growth?
Cell growth is solely influenced by external factors
Cell growth is a continuous process throughout the life of a cell
Cell growth involves an increase in the number of organelles within a cell
Cell growth occurs by cell division
Correct answer is D
Cell growth refers to an increase in cell size or mass over time. Cell growth occurs by cell division, as cells undergo division to increase their numbers and contribute to overall growth in tissues and organisms.
Which of the following statements about viruses is true?
Viruses can reproduce outside of a host cell
Viruses require a host cell to replicate
Viruses possess a cellular structure
Viruses are living organisms
Correct answer is B
Viruses are considered parasitic because they require a host cell to replicate. They do this by injecting their genetic material into the host cell and using the cell's machinery to replicate.
Which of the following best describes a natural habitat in ecology?
An area where organisms naturally live and interact with their surroundings
A human-created environment for wildlife conservation
A controlled laboratory setting for ecological experiments
A protected area for endangered species
Correct answer is A
A natural habitat in ecology refers to an area where organisms naturally live and interact with their surroundings. A natural habitat encompasses the ecological conditions, physical features, and resources that support the survival and interactions of organisms within their natural environment. It includes factors such as climate, vegetation, soil composition, and other biotic and abiotic components.