Following table lists the two major forms of DNA duplexes, conformation of base attached to the sugar and the nature of major and minor grooves.

DNA duplex	Properties
(A)  A form	(i) Syn conformation of the base to sugar
(B)  B form	(ii) Anti conformation of the base to sugar
	(iii) Wide major groove
	(iv) Narrow major groove
	(v) Wide minor groove
	(vi) Narrow minor groove
	(vii) C-3’ endo sugar puckering
	(viii) C-2’ endo sugar puckering

#Question id: 10931

#Unit 7. System Physiology – Animal

A 24-year-old African-American man comes to the emergency room 3 hr after the onset of severe back and chest pain. These problems started while he was skiing. He lives in Los Angeles and had a previous episode of these symptoms 5 years ago while visiting Wyoming. He is in obvious pain. Laboratory studies show the following:

Hemoglobin                                        11 gm/dl

Leukocyte count                                 22,000/μl3

Reticulocyte count                              25%

What is the diagnosis of this patient?

#Question id: 10929

#Unit 7. System Physiology – Animal

Which of the following would describe the condition in a patient with aplastic anemia?

Which of the following is correct?

#Question id: 5687

#Unit 8. Inheritance Biology

The error in meiosis that produces a 47,XYY karyotype is best  described by

#Question id: 5688

#Unit 8. Inheritance Biology

Which of the following are not cause of aneuploidy

#Question id: 5690

#Unit 8. Inheritance Biology

Species I is diploid (2n =4) with chromosomes AABB; related species II is diploid (2n = 6) with chromosomes MMNNOO .Which of the following chromosome  in allotriploid individuals?

#Question id: 5691

#Unit 8. Inheritance Biology

Which of the following most accurately explains the cause for the abnormal numbers of chromosomes during human reproduction that can result in Down syndrome, Turner’s syndrome, or Klinefelter’s syndrome?