fertilisation + viruses

Question 1

formation of zygote

Answer 1

Ovulation releases a secondary oocyte, which is arrested in metaphase II.

If a sperm penetrates the secondary oocyte:
acrosome reaction

It triggers completion of meiosis II.

This produces:

One small polar body (which degenerates),

And one large cell — the ovum (the mature egg).

The nucleus of the ovum then fuses with the sperm nucleus, forming a zygote.

Question 2

Lambda DNA virus

Answer 2

complex protein capsid- non-eveloped, Double-stranded dsDNA

Question 3

HIV

Answer 3

RNA retrovirus enveloped, Single-stranded +ssRNA

Question 4

Ebola

Answer 4

RNA enveloped, Single-stranded −ssRNA

Question 5

TMV

Answer 5

RNA non-enveloped, Single-stranded +ssRNA