Question

maria is concerned because she has been exposed to a small amount of radiation during an x - ray. which of the following is the most likely to tell her?

• radiations from x - rays is not a mutagen.
• mutagens have no effect on the body unless you have inherited them.
• small amounts of a mutagen often do not have an effect on health.
• severe mutations are usually caused by small amounts of a mutagen.

Explanation:

To determine the correct answer, we analyze each option:

• Option 1: Radiation from X - rays is a mutagen (X - rays can cause mutations in DNA), so this is incorrect.
• Option 2: Mutagens (including those from X - rays) can affect the body regardless of inheritance; they can induce mutations in somatic cells, so this is incorrect.
• Option 3: Small amounts of a mutagen can still have an effect on health, as even low - level exposure to mutagens can accumulate over time or cause mutations in critical genes, so this is incorrect.
• Option 4: Severe mutations are usually caused by small amounts of a mutagen? No, severe mutations can be caused by various factors, and small amounts of a mutagen may cause subtle or cumulative mutations. Wait, maybe there is a mis - reading. Wait, the correct reasoning: Mutagens, even in small amounts, can cause mutations. But the option "Severe mutations are usually caused by small amounts of a mutagen" is incorrect? Wait, no, let's re - evaluate. Wait, the question is about a person exposed to a small amount of radiation (a mutagen). The correct option should be related to the fact that small amounts of a mutagen (like radiation) can still have an impact, but among the options, the correct one is "Small amounts of a mutagen often do not have an effect on health" is wrong. Wait, maybe the correct option is "Small amounts of a mutagen often do not have an effect on health" is incorrect, and the correct one is "Severe mutations are usually caused by small amounts of a mutagen" is wrong. Wait, I think I made a mistake. Let's start over. X - rays are mutagens. Even small amounts of mutagens can cause mutations, but the effect on health may be subtle or take time to manifest. Now, looking at the options:
• "Radiation from X - rays is not a mutagen" is wrong (X - rays are mutagens).
• "Mutagens have no effect on the body unless you have inherited them" is wrong (mutagens act on cells regardless of inheritance).
• "Small amounts of a mutagen often do not have an effect on health" – this is the correct answer? No, because even small amounts can cause mutations that may lead to health issues. Wait, maybe the question is phrased differently. Wait, the person is concerned because of small radiation exposure. The correct thing to tell her is that small amounts of a mutagen (radiation) often do not have an effect on health? No, that's not true. Wait, maybe the options are mis - transcribed. Assuming the options are:

Option 1: Radiation from X - rays is not a mutagen (wrong).
Option 2: Mutagens have no effect on the body unless inherited (wrong).
Option 3: Small amounts of a mutagen often do not have an effect on health (this is the answer, as small, acute exposure to a mutagen like low - level radiation may not cause immediate or noticeable health effects, and the body has repair mechanisms).
Option 4: Severe mutations are usually caused by small amounts of a mutagen (wrong, severe mutations are more likely with high - level or long - term exposure, or specific mutagenic events).

Answer:

C. Small amounts of a mutagen often do not have an effect on health (assuming the options are labeled A - D, and this is option C; if the options are as given, the correct option is "Small amounts of a mutagen often do not have an effect on health")