CSIR-UGC National Eligibility Test (NET) for Junior Research Fellowship and Lecturer-ship
Some Important Questions Collected from the Memory of Students and Probable Questions and Answers
Previous and Probable (Memory based) Qustions & Answers Paper-1 Part-A June 2010
Ans 2 Expln. Refer the simple instant notes. – Previous Qns. 2009 June(3rd Qn.)
- Fossils of modern-like humans are found in Africa
- .Stone tools and other artifacts support African origin
- Highest level of genetic variation in DNA
- All the above
Ans. 4 Expln.—There are two theories about the origin of modern humans.
a). They arose in one place – Africa and b) Pre-modern humans migrated from
Africa to become modern humans in other parts of the world. Most evidence points to the first theory because :
- Fossils of modern-like humans are found in Africa.
- Stone tools and other artifacts support African origin.
- DNA studies
Studies of mitochondrial DNA (mt DNA) which occurs only in the cellular organelles called mitochondria, reveal that humans are astonishingly homogeneous, with relatively little genetic variation. In support of an African origin for Homo sapiens the work of Cann and Wilson has demonstrated that the highest level of genetic variation in mt.DNA occurs in African populations. Cont..Refer the simple instant notes.
1.Vinyl alcohol 2. Polysterene
3. Polyethylene 4. Rubber
1. Number remains the same 2. Doubles the number
3. Reduced to half the number 4. Number reduced to one fourth
Ans. 1 Expln.—The series of changes which involve the growth and division of a
cell is called cell cycle. It consists of two stages, interphase (resting phase)
and M phase (mitotic phase).
The M phase starts with the nuclear division , corresponding to the separation of daughter chromosomes (karyokinesis) and usually ends with division of
cytoplasm (cytokinesis) . The interphase, though called the resting phase, is the time during which the cell is preparing for division by undergoing both cell growth and DNA replication in an orderly manner. The interphase is divided into three further phases:
* G1 phase (Gap 1)
* S Phase (Synthesis)
* G2 phase (Gap 2)
G1 phase corresponds to the interval between mitosis and initiation of DNA replication. During G1 phase the cell is metabolically active and continuously grows but does not replicate its DNA. Cont….. Refer the simple instant notes.
3. Fructose and mannose 4. Fructose and galactose
More Questions & Answers Refer Instant Notes