Neco Model Questions Vol1 2025 Biology Question 38

Practice objective / multiple choice question 38 from the 2025 Neco Model Questions Vol1 Biology examination.

Neco Model Questions Vol1 2025 Biology Objective / Multiple Choice Medium Difficulty
Question 38 NECO_MODEL_QUESTIONS_VOL1 • 2025 • BIOLOGY • objective

During the follicular phase of the menstrual cycle, estradiol concentration rises from 30 pg/mL on day 7 to 400 pg/mL on day 12, increasing linearly each day. (i) What is the average daily increase in estradiol concentration? (ii) On which day does the concentration first reach or exceed 250 pg/mL? (iii) Starting on day 8, a drug reduces estradiol synthesis by 20 % of the current amount each subsequent day. Assuming the concentration on day 8 is 400 pg/mL, calculate the estradiol concentration on day 12. (iv) An LH surge is triggered when estradiol exceeds 250 pg/mL. Will the LH surge occur on day 12 under the drug regimen? Justify.

Answer Options

A. Average increase = 74 pg/mL/day; 250 pg/mL reached on day 9; day 12 concentration ≈200 pg/mL (<250 pg/mL), so LH surge will not occur.
Correct Answer B. Average increase = 74 pg/mL/day; 250 pg/mL reached on day 10; day 12 concentration ≈163.8 pg/mL (<250 pg/mL), so LH surge will not occur.
C. Average increase = 74 pg/mL/day; 250 pg/mL reached on day 10; day 12 concentration ≈260 pg/mL (≥250 pg/mL), so LH surge will occur.
D. Average increase = 70 pg/mL/day; 250 pg/mL reached on day 11; day 12 concentration ≈180 pg/mL (<250 pg/mL), so LH surge will not occur.
Correct Answer
B
Correct Option:
Average increase = 74 pg/mL/day; 250 pg/mL reached on day 10; day 12 concentration ≈163.8 pg/mL (<250 pg/mL), so LH surge will not occur.

About This Question

This is Neco Model Questions Vol1 2025 Biology Question 38. It is one of the objective questions from the 2025 Neco Model Questions Vol1 Biology examination.

Difficulty level: Medium .

View More Neco Model Questions Vol1 2025 Biology Questions More Neco Model Questions Vol1 Practice Questions Back to Questions

Master the Exam!

You've seen a preview, but there are thousands more questions plus AI tutor to break down complex solutions.

Unlock Full Access Available for Android & Windows
Chat with Support