Test Bank For Anatomy & Physiology Chapter 3 Latest Exams 2024

1) About how many cells constitute the body of an adult? A) 50 to 100 million B) 50 to 100 billion C) 50 to 100 trillion D) 50 to 100 quadrillion - correct answers C 2) The body is made up of many different cell types, from small circular red blood cells to the elongated smooth muscle cells 20X its size. Why is there such variation in size and shape? A) Different cell sizes are due to nutritional differences. B) Different variations in size and shape allow differentiated cell types to perform unique functions. C) Variations in cell shape and size are due to chromosomal differences between cells. D) Cell size and shape does not vary among cell types. - correct answers B 3) The three major parts of a cell are A) the endoplasmic reticulum, Golgi apparatus, and vesicles. B) the nucleus, nucleolus, and nuclear envelope. C) microtubules, ribosomes, and centrosomes. D) the nucleus, cytoplasm, and cell membrane. - correct answers D 4) A cell is surrounded by an extremely thin, flexible membrane. Why is the membrane selectively permeable? A) It allows all substances to pass through, making it easier to absorb nutrients. B) It allows all organic substances to pass through, but excludes all inorganic substances that could be harmful. C) It allows some substances to pass through and excludes others based on size, polarity, and other factors. D) It does not allow any substances to pass through as they could damage the cell. - correct answers C 5) Cell membranes are described as a fluid mosaic that maintains stability while still allowing movement. What component maintains most of the flexibility of the membrane? A) Phospholipid bilayer B) Integral proteins C) Polysaccharides D) Carbohydrates - correct answers A 6) The major components of the cell membrane are A) lipids and carbohydrates. B) proteins and carbohydrates. C) lipids and proteins. D) carbohydrates and polysaccharides. - correct answers C