Gce Model Questions Vol1 2020 Biology Question 38

Practice objective / multiple choice question 38 from the 2020 Gce Model Questions Vol1 Biology examination.

Gce Model Questions Vol1 2020 Biology Objective / Multiple Choice Medium Difficulty
Question 38 GCE_MODEL_QUESTIONS_VOL1 • 2020 • BIOLOGY • objective

In a female subject the basal luteinising hormone (LH) concentration is 5 IU L\(^{-1}\). During the mid‑cycle LH surge the concentration rises exponentially to 30 IU L\(^{-1}\) after 24 h. (a) Assuming exponential growth, determine the time (in hours) at which the LH level reaches 20 IU L\(^{-1}\). (b) Ovulation is triggered when the LH concentration exceeds 25 IU L\(^{-1}\). How many hours after the start of the surge does ovulation occur?

Answer Options

A. LH reaches 20 IU L⁻¹ after approximately 18.6 h; ovulation occurs at about 24.6 h, i.e. roughly 6.0 h later.
B. LH reaches 20 IU L⁻¹ after approximately 20.4 h; ovulation occurs at about 23.4 h, i.e. roughly 3.0 h later.
Correct Answer C. LH reaches 20 IU L⁻¹ after approximately 18.6 h; ovulation occurs at about 21.6 h, i.e. roughly 3.0 h later.
D. LH reaches 20 IU L⁻¹ after approximately 16.2 h; ovulation occurs at about 20.2 h, i.e. roughly 4.0 h later.
Correct Answer
C
Correct Option:
LH reaches 20 IU L⁻¹ after approximately 18.6 h; ovulation occurs at about 21.6 h, i.e. roughly 3.0 h later.

About This Question

This is Gce Model Questions Vol1 2020 Biology Question 38. It is one of the objective questions from the 2020 Gce Model Questions Vol1 Biology examination.

Difficulty level: Medium .

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