The helmet-like region of the sperm that is similar to a large lysosome and assists penetration of the egg is called the ________.

Correct Answer: D

Rationale: The correct answer is D: acrosome. The acrosome is a specialized organelle in the sperm head that contains enzymes necessary for penetrating the egg during fertilization. It releases these enzymes to help the sperm penetrate the egg's protective outer layer. The flagellum (choice A) is the tail of the sperm that provides motility. The midpiece (choice B) contains mitochondria for energy production. Spermatid (choice C) is an immature sperm cell formed during spermatogenesis.

Correct Answer: B

Rationale: The correct answer is B: Onset of menopause. Puberty is the period of sexual maturation and development, typically occurring in adolescence. Menopause, on the other hand, is the cessation of menstruation and fertility, usually happening in women in their late 40s or early 50s. During puberty in females, there is an increase in fat deposits beneath the skin, widening and lightening of the pelvis to prepare for childbirth, and development of the breasts as part of secondary sexual characteristics. Menopause does not occur during puberty; it is a separate phase in a woman's reproductive life cycle. Therefore, B is the correct answer.

Correct Answer: A

Rationale: The correct answer is A because the corpus luteum secretes progesterone, not FSH. Oogenesis produces ova/ovum, not FSH, LH, or prolactin. FSH and LH are hormones produced by the pituitary gland to regulate the menstrual cycle, not by the corpus luteum or involved in ova production. Prolactin is a hormone involved in milk production, not in oogenesis or corpus luteum function. Therefore, A is correct as it correctly identifies the function of the corpus luteum and the product of oogenesis.

Correct Answer: D

Rationale: The correct answer is D because days 6-14 of the uterine menstrual cycle correspond to the ovulation phase, where an egg is released from the ovary. This is a critical period for fertility. Choice A is incorrect as the perineum refers to the area between the anus and genitals, not a specific phase of the menstrual cycle. Choice B is incorrect as the mons pubis is a fatty tissue overlying the pubic bone, not a phase of the menstrual cycle. Choice C is incorrect as it is incomplete and lacks relevance to the menstrual cycle.

Correct Answer: D

Rationale: The correct answer is D because meiosis occurs in all cells of the body. Meiosis is a specialized type of cell division that produces gametes (sperm and egg cells) with half the number of chromosomes. Fertilization, the fusion of sperm and egg, typically occurs after meiosis in the reproductive organs. Choices A, B, and C are incorrect because they do not directly relate to the process of fertilization or meiosis occurring in all cells. Choice A talks about the outcome of meiosis, choice B refers to a specific organ, and choice C mentions a stage in the development of an egg cell.