Biology GK Questions Quiz-67

1321.A group of genes whose activity is coordinated by a DNA site is called: (1) operon  (2) cistron (3) polysome  (4) polypeptide Answer: 1321.(1) The operon is defined as a group of genes whose activity is coordinated by a DNA site. An operon is a functioning unit of genomic DNA containing a cluster of genes under the control of a single promoter. The genes are transcribed together into an mRNA strand and either translated together in the cytoplasm, or undergo trans-splicing to create monocistronic mRNAs that are translated separately. 1322.Which of the following human genetic disorders is sex-linked ? (1) Haemophilia (2) Cystic fibrosis (3) Albinism (4) PKU Answer: 1322.(1) Haemophilia is a group of hereditary genetic disorders that impairs the body’s ability to control blood clotting, which is used to stop bleeding when a blood vessel is broken. It is a sex-linked recessive disorder which is more likely to occur in males than females. 1323.Which is the largest blood vessel in human body? (1) Aor…