GCSE Biology Question Analysis Topic: Biology - Short Questions
Exam Questions:
1) What are 'true breeding lines' that are used to study inheritance pattern of traits in plants?
2) State the difference between the structural gene in a transcription unit of prokaryotes and eukaryotes.
3) (a) Name any two copper releasing IUDs.
(b) Explain how do they acts as effective contraceptive in human females.
Answers:
For GCSE Biology, you should know:
1) Plants that have been created by repeated self-pollination and have become homozygous for a particular trait are considered to be true breeding lines.
If bred with another true breeding plant, this trait is then passed down to the following generations.
2) While eukaryotic structural genes are divided into exons (coding regions) and introns (non-coding regions), prokaryotic structural genes can be found continuously with any non-coding region.
3) (a) IUDs that release copper are the Cu-T, Cu-7, and multiload 375.
(b) IUDs that release copper work by increasing the phagocytosis of sperm inside the uterus.
The Cu2+ ions released reduce sperm mobility and fertilising capacity, making contraception highly unlikely.
Work hard for your GCSE Biology examination!
End of analysis. Great!
