What choices are available to a family with recurrent genetic problems?

Correct Answer: D

Rationale: The correct answer is D, All of the above, because families with recurrent genetic problems have various options to consider. Decision not to have children can prevent passing on genetic issues. Adoption allows them to expand their family without genetic concerns. Sperm or egg donation provides the option of having biological children through a different genetic source. Therefore, all options - not having children, adoption, and donor options - are available to families dealing with recurrent genetic problems.

Correct Answer: C

Rationale: The correct answer is C because the effective dose is a measurement that accounts for the different biological effects of various types of radiation on tissues or organs. It takes into consideration factors like the type of radiation, the energy, and the sensitivity of the exposed tissue. This makes it a more accurate representation of the potential harm caused by radiation exposure compared to simply measuring the amount of radiation present in the body (choice A) or accounting for shielding effects (choice B). Choice D is incorrect because the effective dose is not the same for gamma rays, beta particles, and alpha particles due to their different penetration abilities and biological impacts.

Correct Answer: D

Rationale: The correct answer is D because ionizing radiation is indeed higher energy, includes particles, and can ionize water, distinguishing it from non-ionizing radiation. Choice A is correct as ionizing radiation, such as x-rays and gamma rays, has high enough energy to remove tightly bound electrons from atoms. Choice B is correct as ionizing radiation includes alpha and beta particles, which are charged particles. Choice C is correct as ionizing radiation can ionize water molecules, leading to the formation of free radicals. Therefore, all of the statements in choices A, B, and C are true, making option D the correct answer.

Correct Answer: D

Rationale: The correct answer is D, taking showers and baths. This is because, on average, showers and baths account for the largest portion of residential water use in the US. Watering lawns and washing clothes also consume significant amounts of water, but not as much as personal hygiene activities. Flushing toilets, while a daily necessity, uses less water compared to showers and baths. Therefore, D is the correct choice based on water usage statistics and typical household habits.

Correct Answer: D

Rationale: The correct answer is D: From oceans. The hydrological cycle starts with water evaporating from oceans due to solar energy. This evaporated water forms clouds, which eventually release precipitation back to earth. This continuous process of evaporation, condensation, and precipitation is known as the hydrological cycle. The other choices, A, B, and C, are incorrect because water primarily comes from oceans to initiate this cycle, not from reservoirs, glaciers, ice caps, lakes, or rivers.