Question

V.
34.
35.
Answer the following questions:
4x4-16
There are 21 terms in an Arithmetic progression. The sum of last three terms
is 123 and the sum of the three middle terms is 69. Find the Arithmetic
progression.
OR
The fourth term of an Arithmetic progression is three times the first term and
7th term exceeds twice the third term by 1. Find the Arithmetic progression.
Prove that the ratio of the areas of two similar triangles is equal to the square
of the ratio of their corresponding sides.
Solve the following pair of equations graphically.
x +y = 6
3x +y = 8
Two poles of equal heights are standing opposite each other on either side of
the road, which is 80 m wide. From a point between them on the round, the
angles of elevation of the top of the points are 600 and 300 respectively. Find
the height of the poles and the distances of the point form the poles.
36.
37.
VI.
38.
Answer the following questions:
1x5=5
A metallic right circular cone 20 cm high and whose vertical angle is 600 is
cut into two parts at the middle of its height by a plane parallel to its base. If
the frustum so obtained be drawn into a wire of diameter - cm, find the
16
length of the wire.​

Answer 1

Answer:

In particular, one protein called HU, which is the most abundant protein in the nucleoid, works with an enzyme called topoisomerase I to bind DNA and introduce sharp bends in the chromosome, generating the tension necessary for negative supercoiling.