Given that there are over 100 million residential addresses in the United States, which of the following best describes a flaw of this survey as it is described?
A. There were not enough age groups to show a trend based on age.
B. The addresses were chosen randomly rather than strategically
C. The distribution of ages in the sample did not reflect the actual population
D. Each response represents only one person per address
While the random selection and large number of surveys sent out were a good start, to truly study the relationship between age and screen usage, it would have been better to have a few more age groups or just a direct age value from each participant rather than four large categories. As far as whether the age distribution accurately reflected the population, we don't have enough information to say if that was a problem or not. Also, the fact that each response is from just one person at the address is not a flaw but a reasonable way to get a good variety of responses
Therefore, the Correct Answer is A.
More Questions on TEAS 7 Science
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Q #1: When animals eat, insulin is released from the pancreas, stimulating glucose uptake by the liver. When glucose levels drop, the pancreas reduces insulin release. This is an example of which mechanism for maintaining homeostasis?
A. Negative feedback
B. Positive feedback
C. Stress response
D. Parasympathetic regulation
Answer Explanation
Maintaining homeostasis means that conditions are kept stable and relatively constant. Negative feedback is a mechanism used to reverse or minimize changes in a system. In this example, negative feedback is used to keep the body's glucose and insulin levels stable. Positive feedback (B) is a mechanism that Increases changes in a system. A stress response (C) describes the body's reaction to threats or pressures. Parasympathetic regulation (D) refers to activities of the nervous system, including slowing the heart rate and boosting Intestinal activity.
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Q #2: Identify the location where neurotransmitters are stored immediately prior to use.
A. Area A
B. Area B
C. Area C
D. Area D
Answer Explanation
Area B is a synaptic vesicle where the neurotransmitters are stored just before use.
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Q #3: Which of the following is true regarding adipocytes?
A. They are involved in the secretion of glucose.
B. They are responsible for storing the fat that is found in adipose tissue
C. They are critical in the digestive breakdown of fat
D. They are the foundational element of muscles
Answer Explanation
Adipocytes are primarily seen in adipose or fat tissue. Their primary function is the storage of fat Adipocytes play a crucial role in maintaining proper energy balance, storing calories in the form of lipids, and mobilizing energy sources in response to stress. They are not involved in the digestion of fat or the secretion of glucose, nor are they the foundational element of muscles
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Q #4: Which of the following is NOT a characteristic of enzymes?
A. They change shape when they bind their substrates.
B. They can catalyze reactions in both forward and reverse directions.
C. Their activity is sensitive to changes in temperature.
D. They are always active on more than one kind of substrate.
Answer Explanation
Enzymes are substrate-specific. Most enzymes catalyze only one biochemical reaction. Their active sites are specific for a certain type of substrate and do not bind to other substrates and catalyze other reactions.
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Q #5: Which of the following does NOT obey the law of independent assortment?
A. Two genes next to each other on a chromosome
B. Two genes on opposite ends of a chromosome
C. Flower color and height in snapdragons
D. Seed color and flower color in peas
Answer Explanation
Two genes next to each other (or within a specified close distance) are said to be linked. Linked genes do not follow the law of Independent assortment because they are too close together to be segregated from each other in meiosis.
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Q #6: How many tissue layers does the uterus have?
A. One
B. Two
C. Three
D. Four
Answer Explanation
The uterus has three layers. The inner layer is called the endometrium. The middle layer is called the myometrium. The outer layer of the uterus is called the serosa or perimetrium.
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Q #7: Which structure of the nervous system carries action potential in the direction of a synapse?
A. Cell body
B. Axon
C. Neuron
D. Myelin
Answer Explanation
Axons carry action potential in the direction of synapses. Axons are the long, fiber-like structures that carry information from neurons. Electrical impulses travel along the body of the axons, some of which are up to a foot long.
A neuron is a type of cell that is responsible for sending information throughout the body. There are several types of neurons, including muscle neurons, which respond to instructions for movement; sensory neurons, which transmit information about the external world; and interneurons, which relay messages between neurons. Myelin is a fat that coats the nerves and ensures the accurate transmission of information in the nervous system.
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Q #8: How many different types of nucleotides are there in DNA?
A. One
B. Two
C. Four
D. Eight
Answer Explanation
There are four different nucleotides in DNA. Nucleotides are monomers of nucleic acids, composed of five- carbon sugars, a phosphate group, and a nitrogenous base. Nucleotides make up both DNA and RNA. They are essential for the recording of an organism's genetic information, which guides the actions of the various cells of the body.
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Q #9: What is a hypothetical explanation for an occurrence that is based on prior knowledge called?
A. Independent variable
B. Dependent variable
C. Trial
D. Hypothesis
Answer Explanation
A hypothesis is the use of prior knowledge in order to provide a hypothetical explanation for why something may or may not occur. A hypothesis can be proved wrong or right based on the results of the experiment and repeated trials.
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Q #10: What types of reaction is Cu (s) + 2AgNO3(aq) → 2Ag(s) + Cu(NO3)2(aq)?
A. Single replacement
B. Double replacement
C. Synthesis
D. Decomposition
Answer Explanation
This is a single replacement reaction in which copper replaces silver. The copper combines with the nitrate ions, and the silver precipitates out. Single replacement reactions have the general form of
A + BC →
AC + B. Double replacement reactions have the general form of AB + CD→
AD + CB. Synthesis reactions have the general form of A + B →
AB. Decomposition reactions have the general form AB→
A+B.
