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NLN Science Practice Questions and
Correct Answers Updated 2025 Rated
A
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 - ANSvariation within a species a cell which manufactures a large amount of protein for export would have an abundance of organelles called - ANSribosomes a circuit contains three 3-ohm (w) resistors in series. what is the equivalent resistance of this combination? - ANS9W a gram stain is an important technique used in the laboratory that - ANSdistinguishes between different kinds of bacterial cell walls A magician rapidly pulls a tablecloth from a table, leaving the dishes undisturbed. Which of these principles of physics explains this "trick"? - ANSObjects at rest tend to remain at rest A material that settles out of a reaction is termed a(n) - ANSemulsion
A method for determining the blood alcohol content of a subject is to - ANSuse 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 - ANScarbon dioxide A person who was in an auto accident has formed a blood clot at the site of the injury. One event that can lead to formation of a blood clot is that - ANSruptured platelets release thromboplastin A quantity that has both magnitude and direction is called a(n) - ANSvector 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? - ANSFeathers for flying 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? - ANSthe approximate focal length of the lens a substance composed of similar atoms (number of protons is the same for all) that can not be broken down chemically is a(n) - ANSelement a substance that increases the speed of a reaction by lowering it's activation energy is called - ANSa catalyst
An example of an adaptation to prevent water loss in plants is - ANSwaxy epidermis An example of the most complex level of organization in a frog is the - ANSrespiratory system anaerobic respiration occurs in muscle tissue when it cannot get sufficient oxygen to function aerobically. which condition can this most likely result from? - ANScramps as an object falls freely near the surface of the earth, its speed increases, representing a transformation of - ANS as part of the human immune response, which of these cells are responsible for producing antibodies? - ANSlymphocytes at room temperature, which of these substances exists as diatomic molecules? - ANSoxygen Charles Darwin's theory of evolution suggests that the reason for the various differences between species is a result of? - ANSnatural selection Cicero and Wozniak probably decided to restrict their study to male offspring of alcoholic male rats because they wanted to - ANScompare results with prior findings from human studies
Cicero and Wozniak used young rats in their experiment instead of older rats because young rats are - ANSmore sensitive to alcohol compounds with the same type of atoms an the same chemical bonds but different spatial arrangements of these bonds and atoms are called - ANSstructural isomers Coulomb's Law is most closely associated with - ANSelectric charges Ductless glands in the human body secrete - ANShormones during exercise, a person's respiratory rate increases due to - ANSan increase in CO2 concentration in the blood energy that is in an object because of it's position is called - ANSpotential energy Enzymes that are involved in biochemical reactions are organic - ANScatalysts ganglia are made up of a cluster of - ANSneurons Guard cells which can be found in the leaves of plants are most closely associated with which of these processes? - ANSEvaporation of water from the plant
in classical physics, light is viewed as part of the electromagnetic spectrum, traveling in the form of transverse waves. Quantum physics proposes that light is composed of quanta called - ANSphotons 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 - ANSthe parent plants that produced the seeds carried the recessive gene for the albino trait In diagnostic testing, the electroencephalogram permits the physician to - ANSexamine the impulses of the nerve cells within the brain In ecological succession, the first living thing to colonize a hitherto barren area is called a - ANSpioneer organism Iodized salt is used to prevent a human condition known as - ANSgoiter most internal gas exchanges in the human respiratory tract occurs across the capillaries of which of these structure's? - ANSalveoli Muscles are attached to bones by what? - ANStendons Reducing the use of aeresol cans has contributed to the decrease of - ANSthe destruction of the o-zone layer
scientists have discovered that most vertebrates have cone cells in their eyes, which distinguish colors in daylight. The rods are most sensitive to light, but do not distinguish colors. if a mammal is nocturnal - ANSthere are fewer cones and a greater concentration of rods to collect the minimal light for night vision scientists have discovered the 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 - ANSthere are fewer cones and a greater concentration of rods to collect the minimal light for night vision sodium will most readily react with - ANSchlorine Substance Y is soluble only in nonpolar solvents and does not conduct electricity, either in the solid or liquid phases. Y is most probably - ANSa non-polar substance Sugar molecules enter a cell against a concentration gradient by the process of - ANSactive transport the amplitude of a sound wave is most closely related to it's - ANSloudness the atoms of an element with seven valence electrons are most probably classified as - ANSnonmetals
the law of dominance was proposed by which of the following scientists? - ANSmendel The light sensitive cells of the eye are called rods and cones. Which of these layers of the eye are they found in? - ANSRetina the meiotic division of cells leads to the production of cells that - ANScontain half usual number of chromosomes the most probable area of study that would show the prevalence of mental illness in mid-Manhattan is that of - ANS the normal boiling temperature of water is 100 degrees when measured on which of these scales? - ANScelsius the number of complete waves which pass a point in one second is known as a - ANSfrequency The organ that filters metabolic waste from the blood is the - ANSkidney The Pap test can detect cancer in the female reproductive tract at an early stage, requiring cells scraped from - ANSthe cervix The physics principle that is primarily used in developing a rollercoaster ride is - ANScentripetal force
the process of nuclear cell division in the cell reproduction of plants differs from mammals. a major difference is that - ANScell plates are synthesized the second law of thermodynamics states that with every spontaneous process, the entropy of the universe - ANSincreases the surface of the moon has almost no atmosphere and is one-sixth the gravitational acceleration of the earth. if the feather and a hammer were dropped near the surface of the moon, - ANSfeather and hammer would hit the surface at the same time the weight of an adult human in Newtons is closest to? - ANS500 N To sterilize a metal probe in the office, a dentist could use a steam sterilizer. If unavailable, the next most effective method to sterilize the instrument would be - ANSboiling it in water for 15 minutes Unicellular organisms that have a nucleus and can swim with the aid of cilia are examples of - ANSprotozoans Water freezes at 0 degrees Celsius. on the kelvin scale, this is equivalent to? - ANS273 K Water freezes at 0 degrees Celsius. on the kelvin temperature scale, this is equivalent to - ANS273 K
which human body system does meiosis occur in? - ANSreproductive system which of these arrangements of atoms is found in all alcohols? - ANSC-OH which of these best illustrates a synthesis reaction? - ANS2Na + Cl2 -> 2NaCl which of these changes occurs in the kidney's when a person becomes dehydrated? - ANSthe filtration rate of water remains constant and the reabsorption of water increases Which of these conditions is associated with smoking? - ANSemphysema which of these could be stopped by a sheet of paper? - ANSalpha particle which of these factor's best summarizes Darwin's theory of the origin of species? - ANSnatural selection which of these factors is a variable in Cicero and Wozniak's research? - ANSliquid diet of 6% alcohol which of these findings suggests a serious illness from a urinalysis? - ANSpresence of glucose and protein which of these germ layers gives rise to the skin? - ANSectoderm
Which of these hydrocarbons is a member of the benzene family? - ANStoluene which of these instruments is used to measure the amount of heat exchanged in a system? - ANScalorimeter which of these is an example of a simple machine -lever -pulley -inclined plane - ANSall of the above which of these is an example of emulsion - ANS Which of these is the correct sequence of chambers through which blood flows in the human heart and lungs? - ANSRight atrium; right ventricle; lungs; left atrium; left ventricle which of these organisms has the most complex digestive system? - ANSearthworm which of these organisms might be found in contaminated well water? - ANSgiardia Which of these organisms use nitrogen directly from the air? - ANSBlue- green algae
Which of these sequences of anatomic organization, from the simplest level to the most complex, is the correct sequence? - ANSFrom tissue, organ, organ system to organism which of these single instruments may be used to measure the current flowing through a circuit? - ANSan ammeter which of these structures contains valves to prevent blood from flowing in the wrong direction? - ANSveins which of these structures produces sperm cells in human males? - ANStestes Which of these substances contains a nonpolar covalent bond? - ANSO Which part of the cell structure controls the passage of materials into and out of the cell? - ANSPlasma membrane which part of the human central nervous system controls voluntary movement? - ANScerebrum While working in the chemistry laboratory, a student spills dilute hydrochloric acid on her hand. What is the first action this student should take? - ANSFlush her hand with large quantities of water Within a living cell, the oxygen (O2) from a mixture of O2 and carbon dioxide (CO2) is used up. This creates a concentration gradient across the
cell membrane, drawing O2 across the membrane from the outside in, a process known as - ANSDiffusion You cut your finger rather deeply while slicing an apple. Which of these actions should you take first? - ANSWash the wound continuously with cold running water
