1
NEET 2019
MCQ (Single Correct Answer)
+4
-1
Change Language
Purines found both in DNA and RNA are:
A
Guanine and cytosine
B
Cytosine and thymine
C
Adenine and thymine
D
Adenine and guanine
2
NEET 2019
MCQ (Single Correct Answer)
+4
-1
Change Language
Variations caused by mutation, as proposed by Hugo de Vries, are :
A
small and directional
B
small and directionless
C
random and directional
D
random and directionless
3
NEET 2019
MCQ (Single Correct Answer)
+4
-1
Change Language
In a species, the weight of newborn ranges from 2 to 5 kg. 97% of the newborn with an average weight between 3 to 3.3 kg survive whereas 99% of the infants born with weights from 2 to 2.5 kg or 4.5 to 5kg die. Which type of selection process is taking place?
A
Disruptive Selection
B
Cyclical Selection
C
Directional Selection
D
Stabilizing Selection
4
NEET 2019
MCQ (Single Correct Answer)
+4
-1
Change Language
Which of the following factors is responsible for the formation of concentrated urine?
A
Secretion of erythropoietin by Juxtaglomerular complex.
B
Hydrostatic pressure during glomerular filtration.
C
Low levels of antidiuretic hormone.
D
Maintaining hyperosmolarity towards inner medullary interstitum in the kidneys