Biology Test 56...

According to Oparin, which one of the following was not present in the primitive atmosphere of the Earth?

Which of following is the longest phase of cell cycle :-

Activation of sarcolemma of muscles causes release of –

Correct flow of water current in sponges is :-

The transverse section of plant material shows the following anatomical features under microscope: Palisade parenchyma towards adaxial surface and spongy parenchyma towards abaxial surface. Plant material should be :-

Ovulation occurs under the influence of :-

Select the correct statements :-

(A) Mutation causes changes in the genotype and the phenotype of an organism.

(B) Chromosomal aberrations are commonly observed in cancer cells.

(C) Sickle cell anemia is a classical example of point mutation.

(D) Deletions and insertions of base pairs of DNA causes frame shift mutations.

Jaya and Ratna are high–yielding semi–dwarf varieties of :-

DNA and RNA differ by :-

Given below are some assisted reproductive technologies (ARTs), in which how many technologies ivolve(s) invitro fertilisation ?

GIFT, ZIFT, ICSI, IUT, IUI