Which of the following is not involved in chemical digestion?
Oral cavity
Stomach
Small intestine
Large intestine
The Correct Answer is D
A. Oral cavity is involved in chemical digestion through the action of salivary enzymes like amylase.
B. Stomach is involved in chemical digestion with gastric acids and pepsin.
C. Small intestine is a major site for chemical digestion and nutrient absorption.
D. Large intestine is primarily involved in the absorption of water and electrolytes and the formation of feces. It is less involved in chemical digestion compared to the other organs listed.
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Correct Answer is A
Explanation
A. Y chromosome: The SRY gene on the Y chromosome codes for the testis-determining factor (TDF), which initiates the development of testes and male characteristics.
B. Gonadal ridges: The gonadal ridges are the precursor structures that develop into gonads but do not contain the gene for TDF.
C. X chromosome: The X chromosome contains genes important for development but does not code for TDF.
D. Fetal testes: The fetal testes produce testosterone but are not the source of the TDF gene.
Correct Answer is A
Explanation
A. Luteinizing hormone (LH); testosterone: Luteinizing hormone (LH) stimulates the interstitial cells (Leydig cells) of the testes to produce and secrete testosterone.
B. Follicle-stimulating hormone (FSH); androgen-binding protein (ABP): Follicle-stimulating hormone (FSH) stimulates the Sertoli cells to produce androgen-binding protein (ABP), but it does not stimulate the interstitial cells to secrete testosterone.
C. Luteinizing hormone (LH); androgen-binding protein (ABP): Luteinizing hormone (LH) stimulates the secretion of testosterone, not androgen-binding protein (ABP). ABP is stimulated by FSH.
D. Luteinizing hormone (LH); estrogen: Luteinizing hormone (LH) stimulates the secretion of testosterone, not estrogen. Estrogen is primarily produced in females and also in males in smaller amounts.