Which of the following describes the most important reason for repeating an experimental investigation?

APAtutuor 1. Which of the following are the sites within the
human body where carbon dioxide and oxygen are exchanged? A.
Alveoli B. Arteries C. Synapses D. Venules
2. Which of the following describes the most important reason
for repeating an experimental investigation? A. To verify the
validity of the original findings B. To expand upon the original
investigation C. To manipulate the independent variable D. To
attempt to disprove the hypothesis
3. Lithium has an atomic number of 3 and a mass number of 7.
Which of the following is the number of protons in a lithium atom?
A.3 B. 4 C. 7 D. 12
4. Which of the following molecules contains the fewest covalent
bonds? A. Water molecule (Hp) B. Ammonia molecule (NH3) C. Methane
molecule (CH4) D. Chlorine molecule (CI2)
5. When salt (NaCI) is added to water, it disassociates into Na•
and Cl-ions. Which of the following types of chemical bond is
present in a salt molecule? A. Covalent bond B. Ionic bond C.
Hydrogen bond D. Disulfide bond
6. An example of active immunity is the transfer of A.
antibodies through the placenta. B. immunoglobulins through
breastfeeding. C. antigens through vaccination. D. immune cells
through a blood transfusion. 7. Which of the following classes of
biological molecules include enzymes? A. Carbohydrates B. Lipids C.
Proteins D. Vitamins
8. Which of the following parts of the circulatory system
carries oxygenated blood? A. An artery moving blood from the heart
to the lungs B. A vein moving blood to the heart from the body C.
An artery moving blood from the heart to a muscle cell D. A venule
moving blood to the heart from the liver
9. Which of the following genetic terms describes an observable
trait of an individual? A. Heterozygous B. Genotype C. Phenotype D.
Homozygous
10. Mutations during which of the following processes in animals
will affect offspring of succeeding generations? A. Meiosis B.
Mitosis C. Translation D. Transcription
11. Which of the following will happen if mRNA fails to be
translated? A. The cell’s nucleus will produce more chromatin. B.
Ribosomes will not be able to create protein. C. Mitochondria will
release ATP. D. The cell will produce more mRNA
12. Which of the following is the balanced equation for
photosynthesis in plant cells? For this one, the formats of the
answers are messed up. The balanced formula is 6Co2+6H20+Energy =
C6H12O6+6O2. Looking at the answers I think B is the one with the
correct formula but cannot be sure. A 3C0+ 3H0 + Energy –)-CH120 +
30 2 266 2 B. 6C0+ 6Hp + Energy–)-CHp + 60 2 616 2 C. CH0 +
30–)-3C0+ 3H0 + Energy 6126 2 2 2 D. CHp + 60–)-6C0+ 6Hp + Energy
616 2 2
13. Which of the following classes of biomolecules are
frequently responsible for bringing about cell differentiation? A.
Transcription factors B. lnterleukins C. Cytokines D. Nucleotidyl
transferases
14. Which of the following is the pH when the concentrations of
hydrogen ions and hydroxide ions in an aqueous solution are equal?
A. 14 B. 7 C. 1 D. 0
15. Which of the following structures is present in both
prokaryotic and eukaryotic cells? A. Golgi apparatus B. Cell
membrane C. Endoplasmic reticulum D. Chloroplast
16. Which of the following is the purpose of valves in the
venous circulatory system? A. Promoting movement of oxygenated
blood toward the heart B. Facilitating stasis of blood in the veins
C. Propelling blood through the vena cava D. Preventing backward
flow of deoxygenated blood
17. Which of the following cellular organelles is the site of
translation during protein synthesis? A. Cell membrane B. Nucleolus
C. Golgi apparatus D. Ribosome
18. In an experiment, a researcher counts the number of oxygen
bubbles produced by water plants placed under different colors of
light. The researcher finds that water plants placed under white
light release more oxygen bubbles than water plants placed under
red light. Which of the following statements is best supported
based on the observation? A. Light can break up water molecules to
form oxygen. B. White light increases photosynthesis in plants. C.
Red light has no affect on the release of oxygen from water plants.
D. An increase in temperature decreases the amount of oxygen
produced by plants. 19. When normal atmospheric conditions are
present, water is constantly being cycled between liquid and
gaseous states by which of the following pairs of processes? A.
Turgor pressure and filtration B. Melting point and condensation C.
Evaporation and condensation D. Filtration and evaporation
20. A scientist has noted a possible relationship between a
certain chemical substance found in fish and the occurrence of
kidney failure in humans. Which of the following preliminary steps
should the scientist take before conducting a controlled
experiment? A. Establish a cause and effect relationship between
the substance and the outcome. B. Review the literature to
determine what other research is available on this topic. C. Write
a research grant proposal to the appropriate federal funding
agency. D. Distribute letters of consent to human subjects who will
be used in the research.
21. In the digestive tract, mouth is to bolus as A. stomach is
to chyme. B. gallbladder is to insulin. C. small intestine is to
carbohydrate. D. esophagus is to peristalsis.
22. A test is performed to see if applying fertilizer to rose
bushes increases the number of flowers on bushes. Which of the
following best relates to the hypothesis for this experiment? A.
Watering all of the rose bushes the same amount throughout the
experiment B. Predicting that fertilizer will increase the number
of flowers on bushes C. Selecting a rose bush that will not be
fertilized D. Measuring the number of flowers on the rose bushes
each week
23. One neutron is added to the nucleus of an atom of carbon-12.
In which of the following ways has the atom been changed? A. It
bonds with different atoms. B. It has an atomic number of 7. C. It
has been changed to an ion. D. It has a greater atomic mass.
24. PlantDeerTiger The first step in the energy chain that
created the bonds of proteins in the tiger’s muscle cells in the
food chain shown above is the A. deer the tiger ate. B. plant the
deer ate. C. photons the sun made. D. carbohydrates the plant
made.
25. Which of the following chemicals is insoluble in water? A.
C6(benzene) H6 B. HCI {hydrochloric acid) C. NH3 (ammonia) D.
NaHC03 (sodium bicarbonate)
26. Which of the following nitrogenous bases is found
exclusively in DNA? A. Adenine B. Cytosine C. Guanine D.
Thymine
27. Both digestion and absorption happen in which of the
following parts of the digestive system? A. Gallbladder B.
Esophagus C. Stomach D. Small Intestine
28. Which of the following tissues would send a message to the
brain indicating that someone has touched something hot? A.
Epithelial tissue B. Nervous tissue C. Muscle tissue D. Connective
tissue
29. Which of the following describes the classification of
humans? A. The genus Homo and the species sapiens B. The phyla Homo
and the species sapiens C. The family sapiens and the genus Homo D.
The class sapiens and the genus Homo
30. Cellular respiration of glucose is an example of which of
the following? A. Anabolism B. Reverse osmosis C. Osmosis D.
Catabolism
31. A student conducts an investigation in which she dissolves 1
gram (g) each of several substances in 50 milliliters (ml) of
water. She has 12 identical plastic cups of water. She places 1 g
of salt in three cups, 1 g of sugar in three cups, and 1 g of
baking soda in three cups. Three cups contain only water. She
places all the cups in a freezer and records the temperature in
each cup every 15 minutes for 4 hours. Which of the following is
the best way for the student to display the results of this
investigation? A. Pie chart B. Bar graph C. Venn diagram D. Line
graph