Nokea
Magnetic resonance imaging might be used to
- A. distinguish between normal and abnormal tissue.
- B. examine an injured knee.
- C. provide detailed images of the brain.
- D. do both A and B.
Correct Answer: B
Rationale: Magnetic resonance imaging, commonly known as MRI, is a non-invasive imaging technique used to visualize internal structures of the body. While it can be used to distinguish between normal and abnormal tissue, one of its common applications is to examine musculoskeletal injuries, such as an injured knee. Choice A has been corrected to mention 'normal and abnormal tissue' instead of 'normal and cancerous tissue' as MRI is not solely used for cancer detection. Choice C is incorrect as MRI can provide detailed images of various body parts, not just limited to the brain. Therefore, the correct answer is to examine an injured knee.
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What causes wrinkled and sagging skin?
- A. Drinking too much water
- B. Heredity alone
- C. Loss of subcutaneous fat and reduced levels of elastin and collagen
- D. Excess subcutaneous fat
Correct Answer: C
Rationale: Wrinkled and sagging skin is primarily caused by the loss of subcutaneous fat and reduced levels of elastin and collagen in the skin. Choice A is incorrect as drinking too much water does not lead to wrinkled and sagging skin. Choice B is incorrect because heredity alone does not cause this condition. Excess subcutaneous fat, as mentioned in Choice D, can contribute to a different skin appearance, such as puffiness, but not wrinkled and sagging skin.
Which of the following is not part of the female reproductive system?
- A. The uterus
- B. The uterine tube
- C. The vulva
- D. The bulbourethral gland
Correct Answer: D
Rationale: The bulbourethral gland is not part of the female reproductive system. This gland is part of the male reproductive system and is responsible for producing a clear fluid that helps in lubrication during sexual activity. Choices A, B, and C are part of the female reproductive system. The uterus is where a fertilized egg implants and develops into a fetus. The uterine tube (fallopian tube) transports eggs from the ovary to the uterus. The vulva includes the external genital organs of the female.
Which of the following characteristics of life and their descriptions are correct?
- A. Responsiveness-sensing changes inside or outside the body and reacting to them
- B. Assimilation-changing absorbed substances into forms that are chemically different from those that entered the body fluids
- C. Respiration-obtaining and using oxygen to release energy from food
- D. Circulation-the movement of substances in body fluids
Correct Answer: D
Rationale: The correct answer is D: Circulation-the movement of substances in body fluids. Circulation refers to the movement of substances like nutrients, gases, and wastes in body fluids to and from cells. Choice A is incorrect because responsiveness is about detecting and responding to changes in the environment, not obtaining and using oxygen. Choice B is incorrect because assimilation is the process of incorporating absorbed substances into the body, not changing them into chemically different forms. Choice C is incorrect because respiration is the process of obtaining energy from food molecules through oxygen, not the obtaining and using oxygen itself.
Cells do not aggregate into organelles based on similar functions.
- A. TRUE
- B. FALSE
- C. Not Sure
- D. None of the above
Correct Answer: B
Rationale: The statement is false. Cells with similar functions do not aggregate into organelles. Organelles are specialized structures within cells that perform specific functions, such as the nucleus, mitochondria, and endoplasmic reticulum. Cells themselves are the basic structural and functional units of organisms, and organelles are located within cells to carry out various tasks. Therefore, cells do not aggregate into organelles, but organelles are found within cells to support their functions. Choices A, C, and D are incorrect as cells do not form organelles by aggregating based on similar functions.
Macromolecules are built of
- A. Monomers
- B. False
- C. Not Sure
- D. None of the above
Correct Answer: A
Rationale: The correct answer is A: Monomers. Macromolecules are built from smaller subunits called monomers. Monomers join together through chemical reactions to form larger molecules known as macromolecules. Option B is incorrect because it does not provide the accurate information regarding macromolecules. Option C is incorrect as it indicates uncertainty, which is not the case here. Option D is incorrect as there is a specific answer related to the composition of macromolecules.