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| 1 | |
Which statement is true about chromosomes? |
| | A) | All chromosomes are made of a material called deoxyribonucleic acid. |
| | B) | Chromosomes are found outside the cell nucleus. |
| | C) | Each chromosome consists of several molecules of DNA. |
| | D) | Chromosomes are found as single strands in every animal and plant cell. |
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| 2 | |
What are the four types of molecules that act as the building-block molecules for a strand of DNA? |
| | A) | guanine, adenine, cytosol, thymine |
| | B) | protein, adenine, guanine, thymine |
| | C) | protein, adenine, cytosol, thymine |
| | D) | adenine, cytosine, guanine, thymine |
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| 3 | |
What is a mutagen? |
| | A) | A mutagen is a change in the usual order of the building blocks in a gene. |
| | B) | A mutagen is a factor that causes a change in DNA. |
| | C) | A mutagen is an organism whose genetic information has been changed by inserting genes from another species. |
| | D) | A mutagen is a segment of DNA that controls and changes the type of protein production. |
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| 4 | |
Which statement best describes a gene? |
| | A) | Every gene consists of a single set of four building-block molecules. |
| | B) | A gene is the segment of the DNA that transports protein and other life-supporting materials. |
| | C) | Each individual DNA molecule found within a strand of DNA consists of only one specific gene. |
| | D) | Each chromosome consists of a single molecule of DNA that can be further divided into segments called genes. |
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| 5 | |
What is the name of the process used to produce genetically identical organisms? |
| | A) | mutation |
| | B) | DNA screening |
| | C) | cloning |
| | D) | transgenic modification |
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| 6 | |
What is the purpose of genetic screening (also known as DNA screening)? |
| | A) | to alter genetic information in an individual by inserting the genes of another species |
| | B) | to correct any mutations in the DNA of an organism |
| | C) | to create identical genetic copies of an organism |
| | D) | to test individuals for the presence of genetic disorders |
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