In the following data table of an experiment carried out at 4° C (39.2° F) over 4 hours, which of the following options represents the dependent variable? Solution in bag Solution outside bag Bag mass change (g) water water -0.2 20% sucrose water +2.4 40% sucrose water +4.3 60% sucrose water +5.8
A. Duration
B. Temperature
C. Sucrose concentrations
D. Bag mass change
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The dependent variable is the variable that is measured or observed in an experiment. It is the variable that changes as a result of the independent variable, which is the variable that is manipulated or controlled by the experimenter. In this case, the dependent variable is the bag mass change, because it depends on the sucrose concentrations in the bag and outside the bag. The other variables, such as duration, temperature, and sucrose concentrations, are independent variables that are set by the experimenter.
Therefore, the Correct Answer is D.
More Questions on TEAS 7 Practice Exam 4
Question 1:
Which of the following allows the AIDS virus, which contains RNA, to insert viral DNA into the DNA of a host T-cell after the AIDS virus enters the cell?
A. Reverse transcriptase, an enzyme encoded by the virus.
B. Receptor proteins located on the surface of the virus.
C. The phospholipids found on the envelope of the virus.
D. The protein that makes up the capsid of the virus.
The Correct Answer is A.Reverse transcriptase, an enzyme encoded by the virus. This enzyme can convert the viral RNA into DNA, which can then integrate into the host cell's genome and hijack its machinery to produce more viruses. The other options are not relevant to this process. Receptor proteins are involved in binding the virus to the cell membrane, but they do not insert viral DNA into the cell. The phospholipids and the protein capsid are structural components of the virus, but they do not have any enzymatic activity.
Question 2:
Which of the following endocrine organs in the diagram below is involved in regulating milk production following childbirth?
A. Ovaries
B. Adrenal glands
C. Thyroid gland
D. Pituitary gland
The Correct Answer is D.Lactation is stimulated by a hormone called prolactin, which is produced by the pituitary gland. The pituitary gland is a small, pea-sized organ located at the base of the brain.
Question 3:
Which of the following substances protects the skin from ultraviolet radiation?
A. Melanin
B. Perspiration
C. Sebum
D. Keratin
The Correct Answer is A.One of the functions of the skin is to protect the body from harmful effects of ultraviolet (UV) radiation. UV rays can damage the DNA of skin cells and cause mutations that may lead to skin cancer. The skin has a natural defense mechanism against UV radiation, which is the production of a pigment called melanin. Melanin is synthesized by specialized cells called melanocytes, which are located in the basal layer of the epidermis. Melanin absorbs UV rays and prevents them from reaching the deeper layers of the skin.
Question 4:
Which of the following vessels carries oxygenated blood?
A. Pulmonary vein
B. Pulmonary artery
C. Superior vena cava
D. Inferior vena cava
The Correct Answer is A.The pulmonary vein is the only vessel in the list that carries oxygenated blood. The pulmonary artery carries deoxygenated blood from the heart to the lungs, where it gets oxygenated. The superior and inferior vena cava are large veins that carry deoxygenated blood from the upper and lower body, respectively, to the heart.
Question 5:
In a hypertonic solution, water flows through aquaporins embedded in the plasma membrane of the cell. This type of transport is best known as which of the following?
A. Osmosis
B. Diffusion
C. Facilitated diffusion
D. Active transport
The Correct Answer is A.One of the ways that cells regulate their water balance is by adjusting to different solute concentrations in their environment. When a cell is placed in a solution that has a higher concentration of solutes than the cell itself, the solution is called hypertonic. In this case, water will tend to move out of the cell through special channels called aquaporins, which are embedded in the plasma membrane. This movement of water across a selectively permeable membrane is a type of passive transport called osmosis. Osmosis does not require any energy input from the cell, unlike other forms of transport such as diffusion, facilitated diffusion, or active transport.
Question 6:
Nitrogen gas is an extremely stable molecule because its structure contains which of the following?
A. lonic bonds
B. Triple covalent bonds
C. Resonance bonds
D. Hydrogen bonds
The Correct Answer is B.Triple covalent bonds. Nitrogen gas consists of two nitrogen atoms that share three pairs of electrons, forming a triple bond. This bond is very strong and requires a lot of energy to break. Ionic bonds, resonance bonds, and hydrogen bonds are weaker types of bonds that do not occur in nitrogen gas.
Question 7:
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. 12
B. 3
C. 4
D. 7
The Correct Answer is B.The number of protons in an atom is equal to its atomic number. In this case, lithium has an atomic number of 3, so it contains 3 protons.
The other choices (A, C, and D) do not represent the correct number of protons for a lithium atom.
Question 8:
Which of the following is the approximate threshold value for mammalian neurons?
A. +35 mV
B. -55 mV
C. 0 mV
D. -80 mV
The Correct Answer is B.The approximate threshold value for mammalian neurons is -55mV.
Question 9:
The measurement indicated by the line across the center of the cell is best referred to as which of the following?
A. Diameter
B. Volume
C. Area
D. Radius
The Correct Answer is A.One way to assess the size of a cell is to measure its diameter, which is the length of a straight line that passes through the center of the cell and touches both sides. The measurement indicated by the line across the center of the cell in the diagram is best referred to as the diameter of the cell.
Question 10:
Which of the following chemicals is released by one type of immune cell to directly activate another type of immune cell?
A. Lysozymes
B. Perforin
C. Cytokines
D. Granzymes
The Correct Answer is C.Cytokines are small proteins that act as chemical messengers between different types of immune cells. They can stimulate or inhibit the activation, proliferation, differentiation, and migration of immune cells. For example, interleukins are a type of cytokine that is produced by one type of white blood cell and can affect the behavior of another type of white blood cell. Lysozymes, perforin, and granzymes are all molecules that are involved in killing pathogens or infected cells, but they do not directly activate other immune cells.