Building blocks of proteins Which of the following organic molecules contain both an amine and carboxyl group?
A. Lipids
B. Proteins
C. Cellulose
D. Chitin
The basic building block of the protein is ammonia, which comprises of ammino group -NH2 and a carboxyl group, -COOH.
Therefore, the Correct Answer is B.
More Questions on TEAS 7 Science
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Q #1: Which of the following vessels carries oxygenated blood?
A. Inferior vena cava
B. Pulmonary vein
C. Pulmonary artery
D. Superior vena cava
Answer Explanation
Pulmonary vein carries oxygenated blood from the lungs to the heart. Pulmonary artery carries deoxygenated blood from the heart to the lungs.
Superior and inferior vena cava bring in deoxygenated blood from all other parts of the body to the heart. -
Q #2: Metabolism of proteins Which of the following substances is excreted by sweat glands in response to the breakdown of proteins and the formation of ammonia?
A. Sebum
B. Urea
C. Lysozymes
D. Water
Answer Explanation
Proteins are nitrogen-based compounds, which when broken down release ammonia. Ammonia is a toxic substance to the body, and sebaceous glands coverts it to urea.
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Q #3: Which of the following best describes veins?
A. thick walled, small lumens, low pressure, lack valves
B. thin walled, large lumens, low pressure, have valves
C. thin walled, small lumens, high pressure, have valves
D. thick walled, large lumens, high pressure, lack valves
Answer Explanation
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Q #4: Which of the following are structural features of the trachea?
A. C-shaped cartilage
B. Smooth muscle fibers
C. Cilia
D. All of the above
Answer Explanation
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Q #5: Which of the following statements best supports the hypothesis that viruses can cause cancer?
A. Cellular DNA has sequences related to viral sequences
B. Cancerous and normal cells share genetic sequences
C. Genes that regulate cell division are found in some viruses
D. Viruses and cancer cells both replicate rapidly
Answer Explanation
Cancer is a condition caused by unregulated division of abnormal cells in parts of the body. For a virus to survive in an organism, it must enter into the host’s cell and take control of the cell’s most activities in order to be able to reproduce and replicate.
Some of the viruses achieve this by inserting their DNA or RNA to that of the host cell. This has a highly likelihood of affecting the DNA or RNA of a host (living organism) which alters their genes, which may lead to host cells becoming cancerous.
For this reason, viruses can cause cancer because the genes that regulate cell division in host cell are found in some viruses.
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Q #6: An atom of lead (Pb) has a mass number of 207. How many neutrons are in the nucleus?
A. 130
B. 125
C. 82
D. 84
Answer Explanation
We find the number of neutrons as follows
Number of neutrons
= mass number – atomic number
= 207 – 82
= 125 neutrons
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Q #7: Which of these processes occurs in the mouth?
A. Ingestion
B. Mechanical digestion
C. Chemical digestion
D. All of the above
Answer Explanation
All of these processes occur in the mouth. Ingestion involves taking food into the mouth, mechanical digestion includes the physical breakdown of food through chewing and mixing with saliva, and chemical digestion begins with the action of enzymes in saliva, such as amylase, which starts to break down carbohydrates.
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Q #8: Building blocks of proteins Which of the following organic molecules contain both an amine and carboxyl group?
A. Lipids
B. Proteins
C. Cellulose
D. Chitin
Answer Explanation
The basic building block of the protein is ammonia, which comprises of ammino group -NH2 and a carboxyl group, -COOH.
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Q #9: Which of the following is the atomic number of an atom that has 12 protons and 12 neutrons?
A. 144
B. 12
C. 24
D. 1
Answer Explanation
elements are arranged on the periodic table based on their atomic number. This identity is critical in evaluating the chemical families of elements in chemistry. Atoms are made of protons, neutrons, and electrons. Protons and neutrons are found in the nucleus while electrons are found outside the nucleus of the atom. It is the number of protons of an atom that gives its atomic number. Therefore, an atom with 12 protons has an atomic number of 12.
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Q #10: Which of these organs is not considered an accessory digestive structure?
A. mouth
B. salivary glands
C. pancreas
D. liver
Answer Explanation
Accessory organs of the digestive system comprise of organs that empty secretions into the alimentary canal. These organs include salivary glands, liver, gallbladder and pancreas. The mount if path of the alimentary canal.
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