Biology
Name the following:
(a) The repeating components of each DNA strand lengthwise.
(b) The complex structure consisting of DNA strand and a core of histones.
(c) The type of bond which joins the complementary nitrogenous bases.
(d) The three components of nucleotide.
Related Questions
Assertion (A): Centrosome is the point of attachment of two chromatids of a chromosome.
Reason (R): Centrosome initiates and regulates the process of cell division as it helps in the formation of spindle fibres.
- Both A and R are True
- Both A and R are False
- A is True and R is False.
- A is False and R is True.
Assertion (A): Meiosis is the kind of cell-division which occurs during gamete formation in the gonads.
Reason (R): During meiosis, chromosome number remains the same in parent cell and daughter cells which is very significant to maintain the identity of the organism.
- Both A and R are True
- Both A and R are False
- A is True and R is False.
- A is False and R is True.
Imagine one cell (A) has undergone one mitotic division and another cell (B) has completed its meiotic division. How many daughter cells would the two produce?
Cell A: ……………………….
Cell B: ………………………..Match the events given in column A with the phase in mitotic cell division in column B
Column "A" Column "B" (a) Chromosomes get arranged in a horizontal plane at the equator. Anaphase (b) Daughter chromosomes move to the opposite poles of a spindle. Prophase (c) Chromosomes become visible as fine long threads. Telophase (d) Chromosomes lose their distinctiveness and gradually become transformed into a chromatin network. Metaphase