which sexually transmitted infection sti can potentially cause infertility in both men and women if left untreated
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1. Which sexually transmitted infection (STI) can potentially cause infertility in both men and women if left untreated?

Correct answer: B

Rationale: Chlamydia is the correct answer because if left untreated, it can lead to serious complications such as pelvic inflammatory disease (PID) in women and epididymitis in men, both of which can cause infertility. Chlamydia is a common sexually transmitted infection that often presents with no symptoms, making it important for individuals to get tested regularly, especially if they are sexually active. It is crucial to detect and treat Chlamydia early to prevent long-term consequences such as infertility. Human papillomavirus (HPV) can lead to genital warts and certain types of cancer but is not typically associated with infertility. Gonorrhea and syphilis can cause serious health problems if untreated, but infertility is more commonly associated with Chlamydia.

2. Which of the following blood proteins can destroy pathogens?

Correct answer: A

Rationale: The correct answer is A: Complement system. The complement system is a vital component of the immune system responsible for destroying pathogens through various mechanisms like promoting inflammation, enhancing phagocytosis, and directly lysing pathogens. Fibrinogen is crucial for blood clotting, the major histocompatibility complex is involved in immune responses, and platelets aid in blood clotting and wound healing. However, none of these directly destroy pathogens as the complement system does.

3. To which of the following bone types do the spine and hips belong?

Correct answer: B

Rationale: The correct answer is B: Irregular bones. The spine and hips belong to the category of irregular bones. Irregular bones have complex shapes that do not fit into other bone type categories. These bones serve functions such as support and protection, and their shapes vary depending on their specific roles in the body. Choice A, curved bones, is incorrect because bones like ribs are typically described as curved, not the spine and hips. Choice C, flat bones, is incorrect as flat bones include the skull and ribs, but not the spine and hips. Choice D, long bones, is also incorrect because long bones include bones like the femur and humerus, which are elongated with a shaft and distinct ends, unlike the spine and hips.

4. What is the difference between emphysema and chronic bronchitis, both chronic obstructive pulmonary diseases (COPD)?

Correct answer: A

Rationale: Emphysema is characterized by the destruction of alveoli in the lungs, leading to decreased surface area for gas exchange. Chronic bronchitis, on the other hand, involves inflammation and narrowing of the airways, leading to excessive mucus production and coughing. Therefore, the correct difference between emphysema and chronic bronchitis is that emphysema damages the alveoli, while chronic bronchitis inflames the airways. Choice B is incorrect because chronic bronchitis is associated with coughing, not emphysema. Choice C is incorrect as chronic bronchitis is typically less reversible compared to emphysema. Choice D is incorrect as both emphysema and chronic bronchitis are commonly seen in smokers, but chronic bronchitis can also occur in non-smokers due to other factors such as air pollution or genetic predisposition.

5. Which type of orbital can hold a maximum of 10 electrons?

Correct answer: D

Rationale: The correct answer is the f orbital. Each f orbital can hold up to 2 electrons. Since there are 5 f orbitals, the total maximum number of electrons that can be accommodated in f orbitals is 10 (2 electrons per orbital x 5 orbitals = 10 electrons). Therefore, the f orbital can hold a maximum of 10 electrons. Choice A, s orbital, is incorrect because it can hold a maximum of 2 electrons. Choice B, p orbital, is incorrect because it can hold a maximum of 6 electrons (3 orbitals x 2 electrons per orbital = 6 electrons). Choice C, d orbital, is incorrect as it can hold a maximum of 10 electrons (5 orbitals x 2 electrons per orbital = 10 electrons), but the question asks for the type of orbital that can hold a maximum of 10 electrons, not the total number of electrons in d orbitals.

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