What is most likely the pH of a solution containing many hydroxide ions (OH-) and few hydrogen ions(H+)
A. 2
B. 6
C. 7
D. 9
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A solution that contains more hydroxide ions than hydrogen ions is a base, and bases have a pH greater than 7, so the only possible answer is choice D. 9.
Therefore, the Correct Answer is D.
More Questions on TEAS 7 Science Practice Test 1
Question 1:
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
The Correct Answer is D.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.
Question 2:
A patient lying flat on their back is in which of the following positions?
A. Prone
B. Supine
C. Lateral
D. Medial
The Correct Answer is B.Question 3:
There are three Insects that are being compared under a microscope. As a scientist, you decide that measuring them would be an important part of recording their data. Which unit of measurement would best for this situation?
A. Centimeters
B. Meters
C. Micrometers
D. Kilometers
The Correct Answer is C.The best use of the International System of Units (SI) for this situation would be the use of the micrometer as it is the smallest unit of measurement provided and the scientist is using a microscope to view the insects.
Question 4:
Which of these body parts does NOT produce melanin?
A. Hair
B. Nails
C. Skin
D. Iris
The Correct Answer is B.While melanin can be found in nails, it is not produced there. Melanin is the pigment that provides color to skin, hair, and eyes. Although the specific coloring of one's skin, hair, and eyes are genetically determined. environmental factors such as sun exposure can increase melanin production in the skin to help protect it from damage.
Question 5:
Which of the following are examples of homeostatic mechanisms?
A. Increasing heart rate when blood pressure is low, Consuming excess calories to gain weight
B. Lifting weights to increase muscle mass
C. Shivering when the body temperature falls
D. Shivering when the body temperature falls, Secreting insulin to decrease blood sugar concentration, Increasing heart rate when blood pressure is low
The Correct Answer is D.Homeostatic mechanisms are involuntary actions by organs, glands, tissues and cells to maintain balance within the body. For example, if a person becomes dehydrated, the kidneys will retain fluid by decreasing urine output.
Consuming excess calories and lifting weights are not involuntary actions, nor do they maintain the body in its baseline state. Rather, they are actions specifically taken to move the body away from its baseline.
Question 6:
Which of the following statements is FALSE?
A. An organelle is a specialized structure in a cell, such as a ribosome.
B. An organ is made up of similar tissues that perform the same function.
C. Organ systems are two or more organs performing similar functions.
D. A tissue contains a single cell type that works to perform a specific function.
The Correct Answer is D.A tissue contains a variety of cell types that work in conjunction to perform similar functions.
The cells are similar in structure despite being located throughout the body. There are four types of tissues in the human body: connective, epithelial, muscle, and nervous system tissues.
Question 7:
Every child in a certain family has been diagnosed with autism spectrum disorder (ASD). Based on this evidence, what possible conclusion can be drawn about ASD?
A. ASD may be lethal.
B. ASD may be genetic.
C. ASD is related to traditional nuclear family structures,
D. No conclusion can be drawn based on this evidence.
The Correct Answer is B.The evidence says that every child in a certain family has been diagnosed with autism spectrum disorder (ASD). All of these children have genetic commonalities. Therefore, ASD may be genetic.
The evidence does not mention whether the children died from ASD. Therefore, no conclusion can be drawn that ASD may be lethal. Furthermore, the sample size of the evidence is much too small to suggest that ASD is related to traditional nuclear family structures.
Question 8:
How many tissue layers does the uterus have?
A. One
B. Two
C. Three
D. Four
The Correct Answer is C.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.
Question 9:
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
The Correct Answer is A.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.
Question 10:
Which is NOT a type of protein?
A. Fibrous
B. Membrane
C. Globular
D. Unsaturated
The Correct Answer is D.There are three types of proteins: fibrous, membrane, and globular. Fibrous or structural proteins consist of collagen, elastin, and keratin. Membrane proteins are interactive and anchored to a membrane. Globular proteins consist of functional proteins like enzymes, hemoglobin, and insulin.
Therefore unsaturated is the correct answer.