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
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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.
Therefore, the Correct Answer is A.
More Questions on TEAS 7 Practice Exam 4
Question 1:
Which of the following is a mass within the ovary that secretes hormones to maintain the uterine lining during pregnancy?
A. Oviduct
B. Corpus luteum
C. Oocyte
D. Umbilical cord
The Correct Answer is B.Corpus luteum. The corpus luteum is a temporary structure that forms from the ruptured follicle after ovulation. It produces progesterone, which is a hormone that prepares the endometrium (the inner lining of the uterus) for implantation of a fertilized egg. If pregnancy occurs, the corpus luteum continues to secrete progesterone until the placenta takes over.
Question 2:
A myocardial infarction affects which of the following blood vessels of the heart?
A. Pulmonary
B. Aorta
C. Vena cava
D. Coronary
The Correct Answer is D.A myocardial infarction (MI), commonly known as a heart attack, occurs when the flow of blood to the heart is blocked. The blockage is usually due to a buildup of fat, cholesterol and other substances in the heart (coronary) arteries. The fatty, cholesterol-containing deposits are called plaques. The process of plaque buildup is called atherosclerosis. Sometimes, a plaque can rupture and form a clot that blocks blood flow. A lack of blood flow can damage or destroy part of the heart muscle.
Question 3:
Which of the following can lead to a tsunami?
A. Lightning strikes
B. Flooding
C. Earthquakes
D. Sunspot activity
The Correct Answer is C.A tsunami is a series of large waves that are caused by the displacement of a large volume of water in the ocean or a large lake. The most common cause of tsunamis is earthquakes, which can generate seismic waves that travel through the water and create sudden changes in water level.
Question 4:
In a phase diagram, which of the following is the term used for a substance held at a temperature and pressure where the solid, liquid, and gaseous states of a substance exist simultaneously?
A. Triple point
B. Critical temperature
C. Absolute zero
D. Critical point
The Correct Answer is A.A phase diagram is a graphical representation of the physical states of a substance under different conditions of temperature and pressure. A phase diagram usually has pressure on the y-axis and temperature on the x-axis. As we move along the curves of the phase diagram, we can see how the state of the substance changes from solid to liquid to gas, or vice versa.
Question 5:
Which of the following physiological responses is caused by the release of antidiuretic hormone?
A. Decrease in the concentration of calcium in the glomerulus
B. Increase in water reabsorption in the collecting duct
C. Increase in the concentration of calcium in the glomerulus
D. Decrease in water reabsorption in the collecting duct
The Correct Answer is B.Anti-diuretic hormone (ADH) is a hormone that regulates the amount of water in the body. It is produced by the hypothalamus and released by the posterior pituitary gland. ADH acts on the kidneys to increase the reabsorption of water from the filtrate back into the blood. This reduces the volume and increases the concentration of urine.
Question 6:
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 7:
Which of the following microorganisms lack their own metabolic pathways and can only reproduce inside of a host cell?
A. Viruses
B. Bacteria
C. Helminths
D. Protozoa
The Correct Answer is A.Among the four types of microorganisms listed, only viruses lack their own metabolic pathways and can only reproduce inside of a host cell. Viruses are considered to be obligate intracellular parasites, meaning that they depend on another living cell for their survival and replication. Bacteria, helminths, and protozoa, on the other hand, are able to metabolize nutrients and energy from their surroundings and can reproduce independently of a host cell.
Question 8:
Which of the following is the process in which an ovarian follicle matures and releases a reproductive egg?
A. Oogenesis
B. Ovulation
C. Menstruation
D. Fertilization
The Correct Answer is B.The process in which an ovarian follicle matures and releases a reproductive egg is called ovulation. Ovulation is one of the phases of the menstrual cycle, which also includes follicular phase, luteal phase and menstruation
Question 9:
To separate genomic DNA fragments by size, which of these laboratory methods is most useful?
A. Filtration
B. Spectrophotometry
C. Titration
D. Electrophoresis
The Correct Answer is D.One of the most common techniques for separating DNA fragments by size is electrophoresis. Electrophoresis is a process that uses an electric field to move charged molecules through a porous gel matrix. The gel acts as a sieve, allowing smaller molecules to move faster and farther than larger ones. By applying a dye to the DNA samples and loading them into wells at one end of the gel, the DNA fragments can be visualized as bands after electrophoresis. The distance of each band from the well indicates the size of the corresponding DNA fragment.
Question 10:
Which of the following is the atomic number of an atom that has 12 protons and 12 neutrons?
A. 24
B. 1
C. 12
D. 144
The Correct Answer is C.The atomic number of an atom is defined as the number of protons in its nucleus. Protons are positively charged particles that make up part of the atomic mass, along with neutrons, which have no charge. The number of neutrons can vary for atoms of the same element, resulting in different isotopes. However, the number of protons is always constant for a given element. Therefore, to find the atomic number of an atom that has 12 protons and 12 neutrons, we only need to look at the number of protons.