STD 11 - 11. photosynthesis in higher plants — NEET STD 11 Science — Question

Restriction endonucleases are enzymes which

Study the following statements and choose the incorrect statement :
(i) Prior to the work of Avery, MacLeod and McCarty, the genetic material was thought to be a protein. They concluded that DNA is the hereditary material.
(ii) Hershcy and Chase worked to discover whether genetic material was protein or DNA.
(iii) The unequivocal proof that DNA is the genetic material came from the experiments of Alfred Hershey and Martha Chase (1952).
(iv) Hershcy and Chase worked with viruses that infect bacteria called bacteriophage.
(v) Griffith was concluded that DNA transferred from dead to living bacteria.

The endoplasmic reticulum often bears

Different growth phases results in a

Which one of the following statements are correct ?
(i) Chromatids start moving towards opposite poles in anaphase.
(ii) Crossing over occurs between non-sister chromatids of homologous chromosomes.
(iii) Crossing over occurs in tetrad stage which occurs in pachytene of prophase I of meiosis I.
(iv) Chromosomes move to the spindle equator and get aligned along equatorial plate in metaphase.
(v) Crossing over is the reciprocal transfer of genes between the non-homologous chromosomes
(vi) M phase represents the phase when actual cell division occurs and I phase represents the phase between two successive M phase.
(vii) In the 24 hours, average duration of cell cycle of a human cell, cell division proper lasts for only about an hour.
(viii) M phase constitutes more than 95% of the duration of cell cycle.
Choose the correct option given below :-

Which of the following pairs come under the group chrysophytes?

Fern prothallus is

Coralloid roots of Cycas possess a symbiotic alga