Allmost all living things have cells mainly composed of C) Carbon
Answer: e. both A and C
Explanation:
An endospore can be define as a hard, dormant and non-reproductive structures that develop around the organism. It is in the form of spore or seed like form. But it is not a true spore. These are the asexual structures which are developed in some bacteria under unfavorable environmental conditions such as high temperature, starvation, extreme pH and in desiccation.
Half life is the period of time it takes for one-half of the atoms of an original isotope to decay.
In this example we have: where n= the number of half lives.
Thus:
From this equation n=3. The answer to your question is: 3 half lives have passed which gives the meteorite an age of 4.5*3= 13.5 billion years.
Answer:
The correct answer is b The regulator gene falls off the operator and the structural genes get transcribed.
Explanation:
Tryptophan operon contain3 regulatory genes and 5 structural genes.when adequate amount of tryptophan is present at that time the tryptophan binds to the repressor molecule encoded by tryp R gene.Thus Tryptophan act as co repressor .The repressor molecule bound to tryptophan interacts with operator region resulting in blocking the expression of structural genes.
But when tryptophan is absent at that time repressor molecule cannot function.As a result the repressor molecule fall off from the operator and structural genes get transcribed.
Answer: cuz someone could get hurt while on the site
Explanation: