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
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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 Custom TEAS Science Practice Test 1
Question 1:
If a portion of strand of DNA bases reads 5’ AGCTAGCGT 3’, what would the sequence of bases on the complementary strand read?
A. 5’ UCGAUCGCA 3’
B. 3’ TCGATCGCA 5’
C. 5’ TCGUTCGCU 3’
D. 3’ AGCTAGCGT 5’
The Correct Answer is B.The complimentary base pairing of DNA states that A pairs with T while C pairs with G. From the give sequence, the complimentary DNA strand will be 3’ TCGATCGCA 5’
Question 2:
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
The Correct Answer is B.We find the number of neutrons as follows
Number of neutrons
= mass number – atomic number
= 207 – 82
= 125 neutrons
Question 3:
Which of Mendel's laws or principles states that gametes carry one allele for each trait?
A. law of segregation
B. independent assortment
C. gene segregation
D. phenotype assortment
The Correct Answer is A.Question 4:
In a plant in which fuzzy leaves (F) are dominant over smooth leaves (f), which of the following crosses will produce only offspring with smooth leaves?
A. Ff x ff
B. Ff x Ff
C. FF x FF
D. ff x ff
The Correct Answer is D.Crossing is the breeding of parents to produce an offspring. Given that f is a recessive allele of smooth leaves while F is the dominant allele of fuzzy leaves. Therefore, where there is F crossing with f, the offspring will have fuzzy leaves over smooth one.
Therefore, for an offspring to have smooth leaves, ff and ff must cross to produce an offspring with smooth leaves.
Question 5:
A myocardial infarction affects which of the following blood vessels of the heart?
A. Aorta
B. Vena cava
C. Pulmonary
D. Coronary
The Correct Answer is D.A myocardial infarction refers to heart attack, which result from blockage of blood flowing into the heart.
Blocking is caused by the deposition of fat or cholesterol that forms plaque on the surface of coronary arteries, which supply blood to the heart.
Question 6:
Base your answer on the graph and on your knowledge of biology. Which is a true statement about the relationship between pH and enzyme action?
A. All enzymes work best at a neutral pH.
B. Adding more acid does not affect the rate of activity of an enzyme.
C. Enzymes function only in a pH range of 4.0 to 5.5.
D. The activity of an enzyme is affected by pH.
The Correct Answer is D.Question 7:
Which of the following processes causes most of the carbon dioxide from the blood to move into the alveoli?
A. Diffusion down a concentration gradient
B. Conversion of carbon monoxide
C. Passive transport using carrier proteins
D. Active transport using energy
The Correct Answer is A.Carbon dioxide moves from the blood to the alveoli through the process of diffusion. The blood has a high concentration of carbon dioxide than the alveoli.
Therefore, carbon dioxide diffuses from blood to alveoli through the cell membrane.
Question 8:
Which of the following processes does atmospheric pressure play a role in?
A. Pulmonary Ventilation
B. Photosynthesis
C. Osmosis
D. Evaporation
The Correct Answer is A.Among the choices provided, only one process is directly influenced by atmospheric pressure:
Pulmonary Ventilation (Correct): Pulmonary ventilation, also known as breathing, is driven by pressure differences between the lungs and the atmosphere. Atmospheric pressure plays a pivotal role in this process by facilitating the movement of air into and out of the lungs.
The other options mentioned in the choices—Photosynthesis, Osmosis, and Evaporation—are not primarily influenced by atmospheric pressure. While atmospheric pressure can indirectly affect certain aspects of these processes, it is not a dominant factor in their mechanisms.
Question 9:
Contraction of the external intercostal muscles causes which of the following to occur?
A. The diaphragm moves downward
B. The rib cage is compressed
C. The thoracic cavity volume decreases
D. The ribs and sternum move upward
The Correct Answer is D.The intercostal muscles are muscles are located along the ribs. The intercostal muscles assist in respiration mechanically. This allows the expansion and contraction of the thorax.
Contraction of the external intercostal muscle causes the ribs and sternum move upward.
Question 10:
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
The Correct Answer is C.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.