Answer: a) substrate and cofactors b) covalent modification
Explanation:
Metabolic pathways involve all the chemical processes takes place in the enviornment or in an organisms.The metabolic pathways are controlled through the catalytic activities of enzymes.
The availability of enzyme is regulated by substrate and cofactors present in enzyme and enzyme activity is commonly regulated via covalent modification.
Enzymes are highly selective in nature and bind to a specific substarte only. The active site in enzyme binds with the substrate to form enzyme substrate complex. Coactors assist the enzyme activity, without cofactor enzyme can not perform its activity.
Hence enzyme availibility is regulated by substrate and cofactors regulates.
Covalent modifications regulates activity of enzyme as it involves addition and removal of chemical group to synthesis required protein. It can change the chemical properties of the site by targeting one or multiple amino acid.
Thus the correct answer is a) substrate and cofactors b) covalent modification
In the cross-section of a kidney, there are three main regions that become apparent. The outer region is called the "renal cortex", this is where the capillaries are mainly located. The deeper and darker region, that looks like small pyramids arranged in a semicircle is called the "renal medulla", where the filtering of the blood takes place. The flat, tube-like structure is called the "renal pelvis".
<u>T cells lymphocytes </u>are a type of white blood cell that actively target and destroy infected cells via the production of antibodies.
Sedimentary rocks form layers. Thus, the correct option is A.
<h3>What are Sedimentary rocks?</h3>
Sedimentary rocks may be defined as a type of rocks that are created by the collection or deposition of mineral or organic particles on Earth's surface. After this, an activity of cementation is followed.
The layer of sedimentary rocks determined the age of fossils that are buried in those such layers.
Therefore, the correct option is A.
To learn more about Sedimentary rocks, refer to the link:
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Answer:
The correct option is B. It helps the fertilized egg attach to the uterine wall.
Explanation:
The uterus contains some of the strongest muscles of the body. It is made up of three thick layers:
1. The perimetrium 2. the myometrium and 3. the endometrium.
The walls of the endometrium thicken during ovulation and also pregnancy.
When fertilization occurs, the walls of the uterus help the eggs to stick to the uterine walls. The endometrium thickens more and more to protect the egg and to nourish it..
