Nokea
Which hormone promotes the final step of spermatogenesis?
- A. Relaxin
- B. Testosterone
- C. Inhibin
- D. Estrogen
Correct Answer: B
Rationale: The correct answer is B: Testosterone. Testosterone promotes the final step of spermatogenesis, which is the maturation of spermatids into spermatozoa. Testosterone is essential for the development and maintenance of male reproductive tissues and secondary sexual characteristics.
Choice A, Relaxin, is not involved in spermatogenesis. Choice C, Inhibin, regulates FSH secretion but does not directly promote the final step of spermatogenesis. Choice D, Estrogen, is a female sex hormone and not directly involved in spermatogenesis.
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Sperm production begins in the
- A. seminiferous tubules
- B. epididymis
- C. vas deferens
- D. ejaculatory duct
Correct Answer: A
Rationale: The correct answer is A: seminiferous tubules. Sperm production starts in the seminiferous tubules of the testes through a process called spermatogenesis, involving the division and maturation of germ cells. The other choices, B: epididymis, C: vas deferens, and D: ejaculatory duct, are incorrect as they are not sites of sperm production but rather play roles in sperm storage, transport, and ejaculation, respectively. The seminiferous tubules are specifically designed for sperm production, making them the correct choice in this context.
Reproduction in humans usually requires
- A. the process of cloning
- B. mitotic cell division of gametes
- C. gametes with chromosomes that are not paired
- D. the external fertilization of sex cells
Correct Answer: C
Rationale: The correct answer is C because reproduction in humans typically involves the fusion of gametes with chromosomes that are not paired, resulting in the formation of a zygote with a complete set of paired chromosomes. This process is known as sexual reproduction. Choice A, cloning, does not involve the fusion of gametes and is a form of asexual reproduction. Choice B, mitotic cell division of gametes, is incorrect as gametes undergo meiosis to form haploid cells, not mitosis. Choice D, external fertilization of sex cells, is not typical in humans as fertilization usually occurs internally.
The embryo, upon reaching the UTERUS, will embed itself into the endometrium. This is called _____
- A. Menopause
- B. ovulation
- C. Implantation
- D. menstruation
Correct Answer: C
Rationale: The correct answer is C: Implantation. After fertilization, the embryo travels through the fallopian tube and reaches the uterus. During implantation, the embryo attaches itself to the endometrium lining of the uterus for further development. Menopause (A) is the cessation of menstrual cycles, ovulation (B) is the release of an egg from the ovary, and menstruation (D) is the shedding of the uterine lining if fertilization does not occur.
The ovarian follicles are located in the following structures, EXCEPT:
- A. the Fallopian tubes;
- B. the uterus;
- C. the medullar area of the ovary;
- D. the cortical area of the ovary;
Correct Answer: B
Rationale: The correct answer is B, the uterus. Ovarian follicles are structures within the ovaries where oocytes (eggs) develop. The Fallopian tubes, medullar area, and cortical area of the ovary all contain ovarian follicles. The uterus, on the other hand, is not where ovarian follicles are located; it is the organ where a fertilized egg implants and a pregnancy develops. Therefore, the correct answer is B because the uterus is not a structure where ovarian follicles are present.
Sponges reproduce through which form of asexual reproduction?
- A. Fission.
- B. Budding.
- C. Fragmentation.
- D. Parthenogenesis.
Correct Answer: B
Rationale: The correct answer is B: Budding. In budding, a new organism develops as an outgrowth or bud on the parent organism. This process results in the formation of a genetically identical offspring. Sponges reproduce asexually through budding by forming small growths, which eventually detach and grow into new individuals. Fission (A) involves the splitting of an organism into two separate organisms, which is not how sponges reproduce. Fragmentation (C) is the breaking of the parent organism into fragments, with each fragment developing into a new individual, but this is not how sponges reproduce asexually. Parthenogenesis (D) is a form of asexual reproduction in which an unfertilized egg develops into a new individual, which is not the method used by sponges.