NLN PAX PREP Science - Spring 2021 Already Passed

NLN PAX PREP Science - Spring 2021 Already Passed Which of these structures of the male reproductive system carries sperm cells from the testes to the lower part of the abdomen? ✔✔Vas deferens A method for determinin ...

NLN PAX PREP Science - Spring 2021 Already Passed Which of these structures of the male reproductive system carries sperm cells from the testes to the lower part of the abdomen? ✔✔Vas deferens A method for determining the blood alcohol content of a subject is to ✔✔Use a Breathalyzer A person blows his breath into a straw that is placed in limewater. The limewater becomes cloudy because the person's breath contains ✔✔carbon dioxide A physician measures the pulse and blood pressure (BP) of all patients on a routine basis. Which of these measurements show the normal BP values for a resting adult patient? ✔✔120/80 mm Hg A student focuses sunlight to a point with a thin converging (convex) lens. Which of these direct measurements can the student make as a result of this experiment? ✔✔The approximate focal length of the lens. A woman suddenly chokes on a piece of food and clutches frantically at her throat. An immediate remedy is to ✔✔Apply quick, hard pressures successively to her abdomen, just beneath her diaphragm. An unknown gas is denser than air, does not support combustion, and turns a limewater solution cloudy. This gas is most probably ✔✔Carbon dioxide Guard cells which can be found in the leaves of plants are most closely associated with which of these processes? ✔✔Evaporation of water from the plant.Human testes produce ✔✔Spermatozoa If a red light is passed through a dilute solution of chlorophyll solution, the spectrophotometer will detect what amount of transmittance of this light? ✔✔50% - 75% If the medulla of the brain in a human was damaged, which of these conditions would most likely result? ✔✔Difficulty in breathing In ecological succession, the first living thing to colonize a hitherto barren area is called A. producer B. primary consumer C. pioneer organism D. carnivore ✔✔Pioneer organism In varieties of matter, the term heterogeneous may be applied to ✔✔Mixtures, but not elements or compounds The inherited factors that are transmitted in an organism from generation to generation are called its Homozygote. ✔✔Genotype The organ that filters metabolic waste from the blood is the Small intestine. ✔✔kidney Unicellular organisms that have a nucleus and can swim with the aid of cilia are examples of Monerans. A. monerans B. plantsC. fungi D. protozoans ✔✔protozoans Which of these conditions is associated with smoking? ✔✔Emphysema Which of these organisms use nitrogen directly from the air? ✔✔Blue-green algae. Which of these particles can only be found in the nucleus of an atom? ✔✔protons and neutron Which of these processes is responsible for the recorded production of CO2 by yeast cells from sugar solution? ✔✔Anaerobic respiration Which of these quantities is a vector quantity? ✔✔Energy Which of these temperatures is known as Absolute Zero? ✔✔O ° K While working in the chemistry laboratory, a student spills dilute hydrochloric acid on her hand. What is the first action this student should take? ✔✔Flush her hand with large quantities of water. Within which of these structures of the female reproductive tract is the human egg fertilized? ✔✔Fallopian tube A cell which manufactures a large amount of protein for export would have an abundance of organelles called ✔✔Ribosomes A substance that increases the speed of a reaction by lowering its activation energy is called ✔✔A catalystAll of these groups of land plants produce seeds EXCEPT A. perennial flowering plants, such as peonies and asters. B. deciduous trees, such as maple and oaks. C. moist forest plants, such as mosses and ferns. D. evergreen trees, such as pines and spruces. ✔✔moist forest plants, such as mosses and ferns (NOTE: "Evergreen trees, such as pines and spruces" is NOT the right answer even though NLN practice test says so!) As part of the human immune response, which of these cells are responsible for producing antibodies? ✔✔Lymphocytes Ductless glands in the human body secrete ✔✔Hormones Ganglia are made up of a cluster of ✔✔neurons If a person is fasting for 24hrs and ingest no carbohydrates the liver will provide for the body's need by ✔✔Converting glycogen into glucose If all of the second-order consumers within an ecosystem of a region were removed, the most likely short-term effect would be ✔✔An increase in the number of first-order consumers 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 In the reaction of iron with water shown below, what coefficient must be placed before the iron(Fe) to balance the reaction?Fe + 4H 2 O ° Fe 3 O 4 + 4H 2 ✔✔3 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 ✔✔There are fewer cones and a greater concentration of rods to collect the minimal light for night vision. Substance Y is soluble only in nonpolar solvents and does not conduct electricity, either in the solid or liquid phases. Y is most probably ✔✔A nonpolar substance. The weight of an adult human in newtons (N) is closest to ✔✔500N When a column of air is vibrating at the same rate as a tuning fork, the process is referred to as A. assimilation B. diffraction C. transmission D. resonance ✔✔Resonance When a sperm and egg join to form a zygote in humans, what determines the sex of the child that is produced? ✔✔The sperm A drop of dilute ammonium hydroxide (NH4OH) is placed on one side of a slide containing a large number of swimming paramecium. Under this condition, which of these behaviors of the paramecia will be observed? ✔✔They will eventually all swim away from the ammonium hydroxide. In diagnostic testing, the electroencephalogram permits the physician to ✔✔examine the impulses of the nerve cells within the brain.Heat energy is absorbed in which of these phase changes? ✔✔Br2 (l) -> Br2 (g) Iodized salt is used to prevent a human condition known as ✔✔goiter The bending of a wave around an obstacle is known as ✔✔diffraction The process of nuclear cell division in the cell reproduction of plants differs from mammals. A major difference is that ✔✔cell plates are synthesized Which of these equation best illustrates a synthesis reaction? A. 2Na + Cl2 --> 2NaCl B. NaOH + HCl --> NaCl + H2O C. 2H2O2 --> 2H2O + O2 D. CH4 + 2O2 --> CO2 + 2H2O ✔✔2Na+Cl2->2NaCl Which of these hydrocarbons is a member of the benzene family? ✔✔Toluene Which of these pairs of units measures the same quantity? A. Joule and newton. B. Newton and watt. C. Calorie and joule. D. Watt and calorie. ✔✔Calorie and joule Which of these single instruments may be used to measure the current flowing through circuit? ✔✔An ammeter Which of these substances contains a nonpolar covalent bond?-NaCl -HBr -O2 -NH3 ✔✔O2 Which part of the cell structure controls the passage of materials into and out of the cell? ✔✔Plasma membrane You cut your finger rather deeply while slicing an apple. Which of these actions should you take first? ✔✔Wash the wound continuously with cold running water. 30 students in a class carefully measure the length and width of 20 peanut shells. They also count the number and note the size of the peanuts inside. This information is recorded on various graphs showing the numbers of nuts and the different sizes. The collected evidence of the peanuts gives the students an idea of the extent of ✔✔variation within a species A lens that focuses distant light to a single point is known as a ✔✔converging lens A magician rapidly pulls a tablecloth from a table, leaving the dishes undisturbed. Which of these principles of physics explains this "trick"? ✔✔Objects at rest tend to remain at rest. A material that settles out of a reaction is termed a(n) A. suspension B. precipitate C. colloid D. emulsion ✔✔precipitate (NOTE: NLN practice test says "emulsion" is the correct answer but it's not.)A recently discovered species has these characteristics: amniotic eggs, a four-chambered heart, and lightweight, honeycombed bones. Which of these ADDITIONAL characteristics is likely to be present? ✔✔Feathers for flying A room temperature, which of these substances exists as diatomic molecules? ✔✔Oxygen (Have No Fear Of Ice Cold Beer: hydrogen, nitrogen, fluorine, oxygen, iodine, chlorine, bromine.) Enzymes that are involved in biochemical reactions are organic ✔✔catalysts If the night temperature drops 50 degrees, the roadrunner's internal energy-conservation permits a lowering of body temperature to ✔✔94 degree F In order to observe the endoplasmic reticulum in a cell, a scientist would us ✔✔an electron microscope The extension of a neuron that carries the impulse to another cell is called A. a cyton B. a synapse C. a dendrite D. an axon ✔✔An axon The full set of genes in an individual is known as ✔✔The human genome The second law of thermodynamics states that with every spontaneous process, the entropy of the universe ✔✔IncreasesThe succession of flora and fauna encountered while climbing a mountain in the northern hemisphere is similar to that found when traveling from the base of the same mountain in which of these general directions? ✔✔North When blood is filtered in the kidney and urine is produced, red blood cells and plasma proteins do not pass through the blood capillaries. This occurs because ✔✔large molecules such as blood and plasma proteins do not fit through the permeable membrane, so they cannot enter the tubules in the kidney. When two atoms share a pair of electrons, the bond between them is called ✔✔covalent 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 Which of these changes occurs in the kidneys when a person becomes dehydrated? ✔✔The filtration rate of water remains constant and the reabsorption of water increases. Which of these could be stopped by a sheet of paper? ✔✔Alpha particles Which of these instruments is used to measure the amount of heat exchanged in a system? ✔✔Calorimeter Which of these organ systems does NOT provide the excretion of subtances? ✔✔Lymphatic system Which of these processes is illustrated by the spreading out of ammonia vapor in