Ans.
Lac (lactose) operon in a type of bacterial operon, which shows a cluster of genes that are regulated by a single promoter. It is composed of an operator, promoter, a terminator, and three structural genes (lacA, lacY, and lacZ), which are responsible for the transport and breakdown of lactose.
The lac operon is an inducible operon as it gets activated in the presence of lactose and expressed its functional genes in the form of proteins (or enzymes) for lactose metabolism.
Thus, the correct answer to be fill in first blank is 'inducible' and in second blank is 'lactose.'
Yes i think so, but not sure
Answer:
Nutrients, for example, (sugars and starch) and proteins can be recognized by the use of an indicator, which is a synthetic that delivers a trademark shading when a specific substance is available. Lipids can be distinguished by their capacity to make paper clear. In this lab, you will test nourishment for different Nutrients, and contrast your tests with principles, which are the aftereffects of tests that show a positive reaction for a known substance.
Explanation:
Substances or mixes that supply your body with energy and the structure squares of full scale particles are called supplements. The food you eat contains nourishment essential to your body. Sugars and starches make up a gathering of natural mixes called Starches, which are significant in providing your body with energy. A few starches furnish your body with inedible fiber, or roughage, which helps processing. Natural mixes called proteins are significant for development and fix. Lipids are natural mixes that can supply as much as multiple times the measure of energy as starches or proteins.
A) DNA fulfils all three conditions:
<span>(1) copy itself precisely - in the process of replication, DNA copies itself and two molecules of DNA are formed. This process is very precise thanks to the great number of proteins involved in these process that prevents error occurring and proteins that can fix the error if it occurs.
(2) be stable but able to be changed - DNA is very stable molecule otherwise, it cannot be a genetic material. However, its chains can separate in a short length so the translational machinery can attach to it and the process of transcription can occur. Also, in crossing over, during meiosis, </span>the exchange of genetic material occurs and chromosomes change a bit.<span>
(3) be complex enough to determine the organism’s phenotype - it contains a number of genes responsible for different traits. All of this results in the </span>organism’s phenotype.
B) DNA copies itself. <span>Meselson and Stahl conducted the experiments on DNA replication in which they used </span>E. coli<span> bacteria as a model system. After they labelled all bacteria's DNA with heavy 15N by using medium with heavy 15N, they switched bacteria to medium with light 14N. After several generations, all bacteria's DNA was labelled with light 14N. This experiment evidenced that the self-replication of DNA is semi-conservative process.</span>
The correct answer is B.
A food web typically start with a plant which serves as the primary producer of food for the other living organisms that are in the food web. The food web is made up of many tropic level, only about 10% of the energy in one tropic level is transferred to the next trophic level.
Looking at option B, you will discover that the food web start with a plant which is mangrove. Insects feed on mangrove, southern leopard frog feed on insects and raccoon feed on American alligator.
