Anatomy & Physiology

Anatomy & Physiology Study Guide

3.5 Chapter Three Practice Exam 1. What is the process that transports solid objects (like bacteria,) into the cell called? a. Pinocytosis b. Phagocytosis c. Receptor-mediated d. Channel-mediated 2. Plasma membranes are said to be what? a. Impermeable b. Selectively permeable c. Actively permeable d. Slightly permeable 3. ________________ ion concentrations are high in the extracellular fluids and ___________ ion concentrations are high in the cytoplasm. a. Calcium, magnesium b. Chloride, sodium c. Potassium, sodium d. Sodium, potassium 4. The organelle responsible for a variety of functions centering around the synthesis of lipids and carbohydrates is ______________________. a. The Golgi apparatus b. The rough endoplasmic reticulum c. The smooth endoplasmic reticulum d. Mitochondria 5. Our somatic cell nuclei contain ____________ pairs of chromosomes. a.

6. The movement of water across a membrane from an area of low solute concentration to an area of higher solute concentration is known as ________________. a. Osmosis b. Active transport c. Diffusion d. Filtration 7. Diffusion is important in body fluids because it tends to ________________________. a. Increase local concentration gradients b. Eliminate local concentration gradients c. Move substances against concentration gradients d. Create concentration gradients 8. Suppose that a DNA segment has the following nucleotide sequence: CTC–ATA– CGA–TTC–AAG– TTA. Which nucleotide sequences would a complementary mRNA strand have? a. GAG–UAU–GAU–AAC–UUG–AAU b. GAG–TAT–GCT–AAG–TTC–AAT c. GAG–UAU–GCU–AAG–UUC–AAU d. GUG–UAU–GGA–UUG–AAC–GGU 9. If a cell lacked ribosomes, it would not be able to _____________________. a. Synthesize proteins b. Produce DNA c. Metabolize sugar d. Divide 10. In a resting transmembrane potential, the inside of the cell is ___________________, and the cell exterior is __________________. a. Slightly negative, slightly positive b. Slightly positive, slightly negative c. Slightly positive, neutral d. Slightly negative, neutral Answer key found on page 366.

8 b. 6 c. 23 d. 46

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