Answer:
D) Tuberculosis
Explanation:
A) Herpes is a sexually transmitted disease
B) Syphilis is a sexually transmitted disease
C) Chlamydia is a sexually transmitted disease
D) Tuberculosis cannot be transmitted sexually. Tuberculosis is transmitted through air. Therefore D) is the correct answer.
Answer:
D. The two students who have two fragments have one restriction site in this region.
Explanation:
The DNA samples from the cheek cells were subjected to digestion with a restriction enzyme. This enzyme is an endonuclease and cuts the DNA at a specific sequence only. This sequence is called a restriction site. If the restriction site is not present in the sample DNA, the restriction enzyme cannot cut it. The presence of one restriction site in the sample DNA would cut it into two DNA fragments.
Similarly, the presence of two restriction sites in each DNA molecule would obtain a total of three DNA fragments per DNA molecule.
Just say we have a big amount of tryptophan in the sense that it exceeds, tryptophan would act as a co-repressor which prevents synthesis of more enzymes for its production
Hope this helps :)