TLS Online TPP Program

#Question id: 169


 An octapeptide composed of four repeating glycylalanyl units has:

#Unit 1. Molecules and their Interaction Relevant to Biology
  1. one free amino group on an alanyl residue.

  2. one free amino group on an alanyl residue and one free carboxyl group on a glycyl residue.

  3. one free amino group on a glycyl residue and one free carboxyl group on an alanyl residue.

  4. two free amino and two free carboxyl groups.

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TLS Online TPP Program

#Question id: 11697

#Unit 7. System Physiology – Animal

In order for male differentiation to occur during embryonic development, testosterone must be secreted from the testes. What stimulates the secretion of testosterone during embryonic development?

TLS Online TPP Program

#Question id: 11698

#Unit 7. System Physiology – Animal

A patient has an elevated plasma thyroxine (T4) concentration, a low plasma thyroid-stimulating hormone (TSH) concentration, and a thyroid gland that is smaller than normal. Which of the following is the most likely explanation for these findings?

TLS Online TPP Program

#Question id: 11699

#Unit 7. System Physiology – Animal

Extracellular ionic calcium activity will be decreased within 1 min by which of the following?

TLS Online TPP Program

#Question id: 11700

#Unit 7. System Physiology – Animal

As menstruation ends estrogen levels in the blood rise rapidly. What is the source of the estrogen?

TLS Online TPP Program

#Question id: 11701

#Unit 7. System Physiology – Animal

Which of the following anterior pituitary hormones plays a major role in the regulation of a nonendocrine target gland?

TLS Online TPP Program

#Question id: 11702

#Unit 7. System Physiology – Animal

An experiment is conducted in which antidiuretic hormone (ADH) is administered at hour 3 to four subjects (A to D). In the following figure, which lines most likely reflect the response to ADH administration in a normal patient and in a patient with central diabetes insipidus?