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TEAS 7 Science Custom TEAS Science Practice Test 1 Which of these organs is not considered ...

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.

Therefore, the Correct Answer is A.

More Questions on TEAS 7 Science

  • Q #1: 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.

  • Q #2: 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

  • Q #3: 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

  • Q #4: 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

  • Q #5: The process that moves nutrients into the blood or lymph is

    A. digestion

    B. ingestion

    C. elimination

    D. absorption

    Answer Explanation

    Digestion is the breakdown of large insoluble food molecules into small water-soluble food molecules so that they can be absorbed into the watery blood plasma.

    Ingestion is the process of taking food, drink, or another substance into the body by swallowing or absorbing it.

    Elimination refers to the removal of indigestible wastes through the anus, in the form of feaces.

  • Q #6: Lithium has an atomic number of 3 and a mass number of 7. Which of the following is the number of neutrons in a lithium atom?

    A. 4

    B. 7

    C. 12

    D. 3

    Answer Explanation

    The atom is identified by the atomic number in the periodic table. The atomic number is equal to the number of protons and mass number is the sum of the number of protons and neutrons in the nucleus of an atom. Thus, to find how many neutrons are in lithium atom we use the formula below.

    Mass number = number of protons + number of neutrons.

    Letting n be number of neutrons in the lithium atom, we have

    7=3+n

    Rearranging the above equation

    3+n=7

    n=7-3

    n=4

    Thus, lithium atom has 4 neutrons.

  • Q #7: Which of the following sequences on a DNA molecule would be complementary to GCTTATAT?

    A. TAGGCGCG

    B. ATCCGCGC

    C. CGAATATA

    D. TGCCTCTC

    Answer Explanation

  • Q #8: The Life Cycle of HIV Which of the following allows the AIDS virus, which contains RNA, to insert viral DNA into the DNA of a host T-cell after the AIDS virus enters the cell?

    A. Receptor proteins located on the surface of the virus

    B. The protein that makes up the capsid of the virus

    C. Reverse transcriptase, an enzyme encoded by the virus

    D. The phospholipids found on the envelope of the virus

    Answer Explanation

    The AIDS virus (HIV virus) is Class VI or Group VI in the Baltimore Classification. Based on the Baltimore Classification, this specifically involves the reverse transcriptase enzyme and it is encoded by the virus.

    This is the enzyme that will produce DNA molecules from the viral RNA. This is the mechanism involved where it will use the reverse transcriptase enzyme to insert viral DNA into the genetic material of the host cell.

  • Q #9: 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

    Answer Explanation

  • Q #10: Which of these infectious agents do not have nucleic acid?

    A. viroids

    B. viruses

    C. bacteria

    D. prions

    Answer Explanation

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