Following events occur during fertilization in mammals.

A. sperm penetrates cumulus layer

B. sperm nucleus delivered into cytoplasm

C. sperm plasma membrane fuses with egg plasma membrane

D. calcium waves

E. enzymes released from acrosome on sperm head enable sperm to penetrate zona pellucida

F. transit through the cumulus or binding to zona pellucida elicits acrosomal reaction in sperm

G. egg completes meiosis and development is initiated

which of the following sequence is correct?

#Question id: 11782

#Unit 7. System Physiology – Animal

Which of the following pairs of hormones and the corresponding action is incorrect?

#Question id: 14086

#Unit 1. Molecules and their Interaction Relevant to Biology

#Question id: 7120

#Unit 5. Developmental Biology

Which of the following is the only true statement regarding compaction in the mouse embryo?

#Question id: 2653

#Unit 2. Cellular Organization

The sequence of the structural genes in the lac operon is

#Question id: 2908

#Unit 2. Cellular Organization

The H3.H4 tetramers and H2A.H2B dimers each interact with a particular region of the DNA within the nucleosome. Which of the following statement is CORRECT regarding the characteristic binding of histones with the DNA?

I. Of the 147 bp of DNA included in the structure, the histone-fold regions of the H2A.H2B dimer interact with the central 60 bp.

II. Histone H3.H4 tetramers occupy a key position in the nucleosome by binding the middle and both ends of the DNA.

III. The amino-terminal region of H4 most proximal to the histone-fold region forms a fourth alpha helix that interacts with the final 13 bp at each end of the bound DNA.

IV. The H3.H4 tetramer associate with approximately 30 bp of DNA on either side of the central 60 bp of DNA bound by H2A.H2B dimer.

V. The two H2A.H2B dimers form the bottom part of the histone octamer located across the disc from the DNA ends.