Correct Answer: A

Rationale: Androgens are male sex hormones, such as testosterone, produced by the testes after they have developed in the embryo. Androgens are responsible for the development of male secondary sexual characteristics. Genotypes refer to an individual's genetic makeup, not hormones. Blastocysts are early stage embryos, not male sex hormones. Teratogens are substances that can interfere with fetal development, not male sex hormones produced by the testes.

Correct Answer: A

Rationale: The correct answer is A. Meiosis is a type of cell division that reduces the chromosome number by half, resulting in the formation of sperm and ova.
Choice B is incorrect because meiosis does not increase the chromosome number.
Choice C is incorrect because meiosis creates genetically diverse gametes, not identical copies of chromosomes.
Choice D is incorrect because meiosis does not primarily function to repair damaged chromosomes.

Correct Answer: A

Rationale: The correct process that happens during mitosis is the breaking apart, replication, and division of DNA strands into two new cells, each with the same number of chromosomes as the original cell.
Choice B is incorrect because it describes base pairing in DNA, not a process specific to mitosis.
Choice C is incorrect as the creation of sperm and ova cells is related to meiosis, not mitosis.
Choice D is incorrect because chromosomes are not created during mitosis; they are replicated and divided equally between the daughter cells.

Correct Answer: B

Rationale: Hemophilia is a genetic disorder characterized by a deficiency in blood clotting factors, leading to prolonged bleeding. Cystic fibrosis is a genetic disorder that affects the lungs and digestive system, not blood clotting. Lymphoma is a type of cancer originating in the lymphatic system and is not related to blood clotting abnormalities. Huntington's disease is a neurodegenerative genetic disorder that affects a person's ability to move, think, and behave.

Correct Answer: A

Rationale: Metronidazole is the correct choice for treating bacterial vaginosis as it is the first-line medication recommended for this condition. Metronidazole works by disrupting the DNA structure of bacteria, making it an effective treatment.
Choice B, Fluconazole, is an antifungal medication primarily used for treating fungal infections, not bacterial vaginosis.
Choice C, Acyclovir, is an antiviral medication used to treat viral infections, not bacterial vaginosis.
Choice D, Clindamycin, is also used to treat bacterial infections but is not the first-line treatment for bacterial vaginosis, making it an incorrect choice in this scenario.