Independent assortment of gene occurs due to the orientation of chromosomes at

• Metaphase-I of mitosis

• Metaphase-I of meiosis

• Metaphase-II of meiosis

• Any phase of the cell division

The non-disjunction, in meiosis may result is extra copy of a chromosome in a sperm cell. During which phase the above phenomenon may occur?

• Prophase-I, prophase-II

• Prophase-I, prophase-II

• Anaphase-I, anaphase-II

• Anaphase-I, telophase-II

23.

Thermococcus, Methanococcus and Methanobacterium are groups of

• Bacteria containing a cytoskeleton and all membrane-bound organelles

• Archaebacteria with peptidoglycan in their cell wall

• Archaebacteria that consists of protein homologous to eukaryotic core histones

• Most advanced type of bacteria

Which of the following sequences represent a possible pathway in the production of a secretory protein?

• Rough ER → Secretory vesicle → Ribosome → Golgi apparatus

• Ribosome → Rough ER → Golgi apparatus → Secretory vesicle

• Secretory vesicle → Golgi apparatus → Ribosomes → Rough ER

• Rough ER → Ribosomes → Secretory vesicles → Golgi appratus

 A connecting link between plant and animal kingdom is

• Paramecium

• Chlamydomonas

• Chlorella

• Euglena

If the free energy change of a reaction is greater than zero, then the reaction is

• Spontaneous

• Non-spontaneous

• At equilibrium

• Endothermic

Organisms who are able to freely interbreed producing fertile off-springs and having a similar blueprint for making these organisms are referred to as

• Species

• Tribe

• Genus

• Sub-genus

The enzyme hexokinase which catalysis glucose to a glucose-6-phosphate in glycolysis is inhibited by glucose-6-phosphate. This is an example of

I. Competitive inhibition

II. non-competitive inhibition

III. feedback allosteric inhibition

Which of the above statements is/are correct?

• I and II

• I and III

• Only III

• All of these

The mitotic cell cycle is divided typically into four phases; G₁, S, G₂ and M. Considering a mitotic cycle time of 18 hrs; the distribution of period of time (in hrs) for each of these phases will be

• G1	S	G2	M
  1	3	5	9

• G1	S	G2	M
  9	1	3	5

• G1	S	G2	M
  9	5	3	1

• G1	S	G2	M
  3	5	9	1

Which of the following is the most primitive ancestor of man?

• Ramapithecus

• Homo habilis

• Australopithecus

•  Homo sapiens neanderthalensis