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The measurement indicated by the line across the center of the cell is best referred to as which of the following?

A. Area.

B. Diameter.

C. Volume.

D. Radius.

Answer Explanation:

Diameter.

The diameter is the measurement of a straight line passing through the center of a circle and connecting two points on its circumference.

In this case, the line across the center of the cell represents the diameter of the cell.

 

Choice A, Area, is not the correct answer because area refers to the amount of space inside a two-dimensional shape.

Choice C, Volume, is not the correct answer because volume refers to the amount of space occupied by a three-dimensional object.

Choice D, Radius, is not the correct answer because radius refers to the distance from the center of a circle to its circumference and is half the length of the diameter.

Therefore, the Correct Answer is B.

More Questions on TEAS 7 Science

  • Q #1: The pleura is a connective tissue sheath that covers which of the following organs?  

    A. Liver

    B. Heart.

    C. Spleen

    D. Lung

    Answer Explanation

    The pleura is a double-layered serous membrane that covers each lung and lines the thoracic cage

    The pleura is a vital part of the respiratory tract.

    Its role is to cushion the lung and reduce any friction that may develop between the lung, rib cage, and chest cavity.

    Each pleura (there are two) consists of a two-layered membrane that covers each lung.

    The layers are separated by a small amount of viscous (thick) lubricant known as pleural fluid.

    The pleura is comprised of two distinct layers: the visceral pleura and the parietal pleura.

    The visceral pleura is the thin, slippery membrane that covers the surface of the lungs and dips into the areas separating the different lobes of the lungs (called the hilum).

  • Q #2: Which of the following represents the complementary strand of a DNA sequence 3' TCGATCGCA 5'?

    A. 3' AGCTAGCGT 5'

    B. 5’ AGCTAGCGT 3’

    C. 5' UCGAUCGCA 3'

    D. 3' TCGUTCGCU 3'

    Answer Explanation

    In DNA, the nitrogenous bases adenine (A) and thymine (T) pair together, while cytosine (C) and guanine (G) pair together.

    Therefore, the complementary strand of the given DNA sequence 3' TCGATCGCA 5' would have the complementary nitrogenous bases as:

    5’ AGCTAGCGT 3’

    NOTE: The 5’ to 3’ direction of the complementary strand is opposite to that of the given strand.

    Choice A.

    3’ AGCTAGCGT 5’ is not correct because it is not complementary to the given strand.

    Choice C.

    5’ UCGAUCGCA 3’ is not correct because it contains uracil (U), which is a nitrogenous base found in RNA, not DNA.

    Choice D.

    3’ TCGUTCGCU 3’ is not correct because it also contains uracil (U), which is a nitrogenous base found in RNA, not DNA.

     

  • Q #3: Which of the following can lead to a tsunami?  

    A. Sunspot activity

    B. Lightning strikes.

    C. Earthquakes

    D. Flooding.

    Answer Explanation

    A tsunami is a catastrophic ocean wave that is usually caused by a submarine earthquake.

    It can also be caused by an underwater or coastal landslide, the eruption of a volcano, or the impact of a meteor or comet in a body of water.

     

    Choice A is not correct because sunspot activity does not cause tsunamis.

    Choice B is not correct because lightning strikes do not cause tsunamis.

    Choice D is not correct because flooding does not cause tsunamis.