NLN NEX SCIENCE EXAM QUESTIONS AND ANSWERS WITH COMPLETE SOLUTIONS VERIFIED GRADED A++

NLN NEX SCIENCE EXAM QUESTIONS AND ANSWERS WITH COMPLETE SOLUTIONS VERIFIED GRADED A++ 7 studiers in 3 days Leave the first rating Practice questions for this set Terms in this set (104) What process is used to free contaminated water of bacteria? treating it with chlorine In a study on the effect of cocaine on the brains of rats, two groups of animals were selected. Each day, Group A was injected with the drug dissolved in water, whereas Group B was injected with water alone. In such a study Group B is included as a control group If a person has a lateral curvature of the spine, which anatomical structure is affected? vertebral column When a person nods their head "yes" or "no", which joint allows for that movement? atlanto-occiptal joint Which of these organisms has the most complex digestive system? earthworm A method for determining the blood alcohol content of a subject is to use a breathalyzer In corn plants, the gene that codes for the presence of chlorophyll is sometimes missing. The resulting seedlings are albino and will not survive. This lethal gene appears in corn populations because the parent plants that produced the seeds carried the recessive gene for the albino trait The sodium (Na+) and water (H2O) solution inside the red blood cell below is at equilibrium with the sodium and water solution in which the cell has been placed (blue box). What membrane transport process has occurred across the cell's plasma membrane? Osmosis Which organ system does NOT provide for the excretion of substances? lymphatic system What process occurs at a neuromuscular junction? impulse transmission Within which structure of the female reproductive tract is the human egg fertilized? fallopian tube Unicellular organisms that have a nucleus and can swim with the aid of cilia are examples of protozoans A woman who is eating in a restaurant suddenly chokes on a piece of food and clutches frantically at her throat. An immediate remedy is to: apply quick, hard pressures repeatedly, just beneath her diaphragm The cell structure that controls the flow of materials into and out of the cell is the plasma membrane In the reaction of iron with water shown below, what coefficient must be placed before the iron (Fe) to balance the reaction? Fe + 4H2O ° Fe3O4 + 4H2 3 What group land plants DONT produce seeds moist forest plants, such as mosses and ferns What pH values represents the most basic solution? 14 When water passes from a region of greater concentration to a region of lesser concentration through a selectively permeable membrane, the process is known as osmosis Scientists have discovered that most vertebrates have cone cells in their eyes, which distinguish colors in daylight. The rods are more sensitive to light, but do not distinguish colors. If a mammal is nocturnal it has likely evolved to have fewer cones and a greater concentration of rods to collect the minimal light for night vision A gram stain is an important technique used in the laboratory that distinguishes between different kinds of bacterial cell walls Which part of the human central nervous system controls voluntary movements? cerebrum Within a living cell, the oxygen from a mixture of oxygen and carbon dioxide is used up. This creates a concentration gradient across the cell membrane that draws in oxygen across the cell membrane from the outside to the inside of the cell. This process is known by which of these terms? diffusion The region of the brain most concerned with coordinating somatic motor function is the cerebellum