Choose the statement that is NOT TRUE:

Correct Answer: D

Rationale: The correct answer is D because crossing-over occurs between non-sister chromatids of homologous chromosomes during meiosis, not between sister chromatids. This genetic exchange results in genetic variation. Fragmentation is followed by regeneration in some organisms, asexual reproduction produces genetically identical offspring, and ovoviviparous embryos do get nourishment from the egg yolk.

Correct Answer: D

Rationale: Step-by-step rationale for why D is correct: 1. Testosterone is a key hormone for muscle growth. 2. It stimulates protein synthesis in muscles. 3. This leads to an increase in skeletal muscle size and mass. 4. Therefore, the correct answer is D. Summary: A: Testosterone does not directly boost basal metabolic rate. B: Testosterone can influence behavior, but this is not the primary function discussed in the question. C: Testosterone does not directly increase bone density.

Correct Answer: D

Rationale: The correct answer is D. Douching can alter the cervical cells and affect the accuracy of the Pap smear results. The rationale is that douching can wash away or change the cervical cells, leading to potential misinterpretation of the test results. Choices A and B are incorrect because the timing of the test and sexual activity can indeed affect the results. Choice C is incorrect as Pap smear results need to be sent to a lab for interpretation by a healthcare provider, not done immediately in the office.

Correct Answer: D

Rationale: The correct answer is D: interstitial cells. Interstitial cells, also known as Leydig cells, are located in the testes and are responsible for producing male sex hormones, primarily testosterone. The other choices, A: epididymis, B: vas deferens, and C: seminiferous tubules, are not directly involved in the production of male sex hormones. The epididymis is a structure for sperm maturation, the vas deferens is a duct for transporting sperm, and the seminiferous tubules are responsible for sperm production through spermatogenesis. Therefore, interstitial cells are the source of male sex hormones, making choice D the correct answer.

Correct Answer: C

Rationale: The correct answer is C: corpora spongiosum. The urethra passes through the corpora spongiosum of the penis, which is a spongy tissue that surrounds the urethra. This allows for the passage of urine and semen during ejaculation. The other choices are incorrect because: A) The tunica albuginea is a fibrous covering of the corpora cavernosa, not the urethra. B) The prepuce is the foreskin that covers the glans penis, not part of the urethra. D) The corpora cavernosa are erectile tissue responsible for penile erection, not part of the urethra's pathway.