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TEAS 7 Science Custom TEAS Science Practice Test 1 Which of the following are used to deter...

Which of the following are used to determine a person’s DNA sequence?

A. Genes

B. Enzymes

C. Hormones

D. Blood types

Answer Explanation:

A gene is the basic physical and functional unit of heredity and it is the DNA that make up genes. Enzymes are biological catalysts that speed up metabolic and cellular reactions in our bodies. Hormones are responsible for controlling the action of certain cells or organs in our bodies. Blood types are of four types, A, B, AB, and O.

Therefore, the Correct Answer is A.

More Questions on TEAS 7 Science

  • Q #1: 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

    Answer Explanation

    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.

  • Q #2: 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 #3: Punnett squares are used by geneticists to determine the probability of different offspring genotypes. In the one shown below, what letter(s) belong in the lower right box?

    A. AA

    B. Aa

    C. aA

    D. aa

    Answer Explanation

    From the given Punnett square, we can cross the genotypes of the two parents and established the phenotypes the offspring will have. The Punnett square is filled as:

     

    A

    a

    a

    Aa

    aa

    a

    Aa

    aa

    The requested answer is aa.

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