Which patients meet the criteria for Chlamydia screening?

Correct Answer: C

Rationale: The correct answer is C because the 22-year-old woman who is sexually active and uses barrier protection inconsistently is at higher risk for Chlamydia infection. Inconsistent use of barrier protection increases the likelihood of exposure to the infection. The other choices (A, B, D) do not specifically mention increased risk factors for Chlamydia. Choice A mentions consistent barrier protection, which lowers the risk. Choice B mentions having one partner, which may reduce the risk compared to multiple partners. Choice D mentions having multiple partners, which increases the risk, but it does not mention current risky behavior like inconsistent barrier protection.

Correct Answer: D

Rationale: The correct sequence of human embryonic development is D: Fertilization - cleavage - gastrulation - organogenesis. 1. Fertilization: The union of egg and sperm forms a zygote. 2. Cleavage: Zygote undergoes rapid cell division without growth. 3. Gastrulation: Formation of three germ layers (ectoderm, mesoderm, endoderm). 4. Organogenesis: Organ formation from germ layers. This sequence reflects the chronological order of events in early human development. Choice A is incorrect as organogenesis occurs after gastrulation. Choice B is incorrect as fertilization should precede cleavage. Choice C is incorrect as organogenesis occurs after gastrulation.

Correct Answer: B

Rationale: The correct answer is B: They are both ovoviviparous. Reptiles and birds are ovoviviparous, meaning they lay eggs that hatch internally and give birth to live young. Reptiles and birds do not require parental care immediately after birth, so choice A is incorrect. They reproduce through internal fertilization, making choice C incorrect. Reproduction through asexual means is not common in reptiles and birds, making choice D incorrect.

Correct Answer: A

Rationale: The correct answer is A: Arcuate line. The pelvic brim is formed by structures at the pelvic inlet. The arcuate line is a ridge on the inner surface of the ilium that contributes to the boundary of the pelvic brim. The other choices, B: Marginal ala of sacrum, C: Pubic tubercle, and D: Sacral promontory, do not directly participate in forming the pelvic brim. The marginal ala of the sacrum is part of the sacrum, the pubic tubercle is located on the pubis bone, and the sacral promontory is a landmark on the sacrum but does not contribute to the pelvic brim.

Correct Answer: B

Rationale: Step 1: The placental barrier is semi-permeable, allowing small molecules like oxygen and nutrients to pass but blocking larger molecules like antibodies. Step 2: IgG antibodies are the only type that can cross the placenta through active transport mechanisms. Step 3: This transfer provides passive immunity to the fetus. Step 4: Options A, C, and D are incorrect as the placenta has 4 main layers, progesterone does not induce preterm labor, and gas diffusion depends on concentration gradients, not pressure gradients.