How many different types of nucleotides are there in DNA?

A. One

B. Two

C. Four

D. Eight

Answer Explanation:

There are four different nucleotides in DNA. Nucleotides are monomers of nucleic acids, composed of five- carbon sugars, a phosphate group, and a nitrogenous base. Nucleotides make up both DNA and RNA. They are essential for the recording of an organism's genetic information, which guides the actions of the various cells of the body.

Therefore, the Correct Answer is C.

Q #1: A patient lying flat on their back is in which of the following positions?

A. Prone

B. Supine

C. Lateral

D. Medial

Answer Explanation
Q #2: Which of the following is an example of a chemical change?

A. Releasing compressed gas to make a bottle-rocket launch

B. Adding water to clay to make slip

C. Crystalizing honey to make candy

D. Including baking soda in a recipe to make it less sour

Answer Explanation

A chemical change involves a chemical reaction and new substances are produced. When baking soda is added to something sour (acidic) it neutralizes the acid and forms new molecules, in this case carbon dioxide and water. A physical change does not produce new substances. Phase changes such as evaporation and sublimation are physical changes. Changing the ratio of ingredients in a mixture, like adding more water to clay, does not change it chemically, but it can change some of the mixture's physical properties.
Q #3: Which of the following statements best defines an organelle?

A. Layer of polysaccharides outside the plasma membrane of cells

B. Abnormal Infectious proteins

C. Specialized structures within a cell

D. Collection of tissues used to serve a specific function

Answer Explanation

Organelles are specialized structures within a cell that serve a specific function. For example, mitochondria supply energy to the cell by generating adenosine triphosphate. Ribosomes are the site for protein synthesis. The nucleus is in charge of all of the activities of the cell.

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How many different types of nucleotides are there in DNA?

More Questions on TEAS 7 Science

Q #1: A patient lying flat on their back is in which of the following positions?

Answer Explanation

Q #2: Which of the following is an example of a chemical change?

Answer Explanation

Q #3: Which of the following statements best defines an organelle?

Answer Explanation

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