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. Centrosome is the point of attachment of two chromatids of a chromosome.
Reason. 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. Meiosis is the kind of cell-division which occurs during gamete formation in the gonads.
Reason. 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