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When does an ovum finish meiosis?

A.

While in a secondary follicle

B.

While in a primary follicle

C.

During fertilization

D.

During implantation

Answer and Explanation

The Correct Answer is C

A. While in a secondary follicle: The ovum completes meiosis only after fertilization, not while in a secondary follicle.

B. While in a primary follicle: The ovum is arrested in prophase I of meiosis while in a primary follicle. Meiosis is not completed until fertilization.

C. During fertilization: The ovum completes meiosis II during fertilization, which is when the second meiotic division is completed.

D. During implantation: Meiosis is not completed during implantation. It is completed at fertilization.


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Related Questions

Correct Answer is D

Explanation

A. It increases both Na+ and K+ secretion: Aldosterone increases sodium (Na+) reabsorption and potassium (K+) secretion, but it does not increase the secretion of both ions.

B. It causes the urine to be more diluted. Aldosterone causes the urine to be more concentrated by increasing sodium reabsorption and potassium secretion.

C. It reduces Na+ reabsorption and K+ secretion. Aldosterone actually increases sodium reabsorption and potassium secretion, not reduces them.

D. It increases Na+ reabsorption and K+ secretion. Aldosterone promotes sodium reabsorption in the kidneys and increases potassium secretion, leading to more concentrated urine.

Correct Answer is C

Explanation

A. Lactose; lactase: Lactase is the enzyme that breaks down lactose, not the other way around.

B. Lipases; micelles: Lipases break down lipids (fats) into fatty acids and glycerol, not micelles. Micelles are formed as part of the digestion process but are not the substrate for lipases.

C. Peptidases; proteins: Peptidases (or proteases) break down proteins into smaller peptides and amino acids. This is the correct answer.

D. Lactase; glucose: Lactase breaks down lactose into glucose and galactose, not just glucose.

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