PAX SCIENCE NLN EXAM

PDF Download

PAX SCIENCE NLN EXAM

Actual Qs and Ans - Expert-Verified Explanation -Guaranteed passing score -100 Questions and Answers

-Format: Multiple-choice / Flashcard

Question 1: Periodontitis is an inflammatory condition of the

A.) gum tissue that surrounds the neck of each tooth.B.) pulp that contains nerve cells and blood vessels of the tooth.C.) dentin that surrounds the soft part of a tooth.D.) enamel that provides a hard surface for chewing.

Answer:

answer:

gum tissue that surrounds the neck of each tooth.Question 2: The process of nuclear cell division in the cell reproduction of plants differs from mammals. A major difference is that A.) homologous chromosomes are paired.B.) centrioles are replicated.C.) spindle fibers are missing.D.) cell plates are synthesized.

Answer:

answer:

cell plates are synthesized.

Question 3: Which of these organisms might be found in contaminated well water?

Answer:

answer:

Giardia

Question 4: Which of these germ layers gives rise to the skin?

Answer:

answer:

ectoderm Question 5: Which of these single instruments may be used to measure the current flowing through a circuit?A.) A voltmeter.B.) An ammeter.C.) A potentiometer.D.) An ohmmeter.

Answer:

answer:

An ammeter.Question 6: 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.) an experimental group.B.) a test group.C.) an exercise group.D.) a control group.

Answer:

answer:

a control group.

Question 7: A magician rapidly pulls a tablecloth from a table, leaving the dishes undisturbed.Which of these principles of physics explains this "trick"?A.) Gravitational force depends directly on mass.B.) Objects at rest tend to remain at rest.C.) Force equals mass times acceleration.D.) An object traveling at constant velocity has no net force on it.

Answer:

answer:

Objects at rest tend to remain at rest.

Question 8: The functional group present in all alcohols is the

Answer:

answer:

hydroxyl group

Question 9: Which of these equations best illustrates a synthesis reaction?

A.) 2Na + Cl2 -> 2NaCl B.) NaOH + HCl -> NaCl + H2O C.) 2H2O2 -> 2H2O + O2 D.) CH4 + 2O2 -> CO2 + 2H2O

Answer:

answer:

2Na + Cl2 -> 2NaCl

Question 10: All of these groups of land plants produce seeds EXCEPT

Answer:

answer:

evergreen trees, such as pines and spruces.

Question 11: Sodium will react most readily with

Answer:

answer: chlorine

Question 12: In varieties of matter, the term heterogeneous may be applied to

A.) elements, but not compounds.B.) compounds, but not elements.C.) compounds and elements, but not mixtures.D.) mixtures, but not elements or compounds.

Answer:

answer:

mixtures, but not elements or compounds.

Question 13: Which of these structures produces sperm cells in human males?

Answer:

answer:

testes Question 14: In order to observe the endoplasmic reticulum in a cell, a scientist would use

Answer:

answer:

an electron microscope Question 15: All living cells contain cytoplasm. Cytoplasm is important because it

Answer:

answer:

controls what moves in and out of the cell.

Question 16: Heat energy is absorbed in which of these phase changes?

A.) Br2 (l) -> Br2(s) B.) Br2 (g) --> Br2(l) C.) Br2 (l) -> Br2(g) D.)