Each metaphases chromosomes is a duplicated structure which costs of two sister chromatids, attached at a point called:
A. Centromere
B. Primary constriction
C. Both A & B
D. Secondary constriction
Biology
Meiosis was discovered and described for the first time in
A. Fish cells
B. Frog embryo
C. Human cells
D. Sea urchin eggs
Precursors of ribosomal subunits are found in
A. Nucleus
B. The peripheral area of a nucleolus
C. Central fibril area of a nucleolus
D. Cytoplasm
The main types of plastids are:
A. Chloroplasts
B. Chromoplasts
C. Leucoplasts
D. All a,b,c
The biggest cell in the world is the egg of:
A. Ostrich
B. Kiwi
C. Turtle
D. Elephant
When and electron pair is shared between two atoms, the resultant bond is
A. Ionic bond
B. Peptide bond
C. Covalent bond
D. None of these
Mitochondrial matrix supports which of these processes
A. Krebs cycle
B. Anaerobic respiration
C. Amino acid metabolism
D. All of these
Glucose is synthesized in the:
A. The granum of chloroplast
B. The thylakoids of the chloroplast
C. The interregnum of the chloroplast
D. The stroma of the chloroplast
The proteins or enzymes which have to be transported out of the cell pass through the:
A. Endoplasmic reticulum
B. Golgi Complex
C. Vacuoles
D. Exocytosis
The source of illumination in a typical laboratory microscope is
A. Visible light
B. Beam of electrons
C. Beam of photons
D. The beam of blue and red light