Step 1: Understanding the role of hormones Progesterone is a hormone produced by the corpus luteum in the ovary after ovulation. It helps maintain the uterine lining, making it suitable for implantation of a fertilized egg.
Step 2: Why other options are incorrect
- Estradiol mainly regulates the menstrual cycle and supports follicular development but does not maintain pregnancy.
- Testosterone is a male hormone and does not play a role in pregnancy.
- Thyroxin regulates metabolism and has no direct role in implantation.
Identify the amino acid which has:

Which of the following are ambident nucleophiles?
[A.] CN$^{\,-}$
[B.] CH$_{3}$COO$^{\,-}$
[C.] NO$_{2}^{\,-}$
[D.] CH$_{3}$O$^{\,-}$
[E.] NH$_{3}$
Identify the anomers from the following.

The standard Gibbs free energy change \( \Delta G^\circ \) of a cell reaction is \(-301 { kJ/mol}\). What is \( E^\circ \) in volts?
(Given: \( F = 96500 { C/mol}\), \( n = 2 \))