Answer:
Option D, Essentially none
Explanation:
The essential condition for lac operon to express its subsequent proteins i.e laz A, lacZ and lacY are as follows –
a) Absence of glucose
b) Presence of Lactose.
In fact absence of glucose is must. In case when lactose is absent and glucose is present then the lac z sub-protein whose product is β-galactosidase is not expressed. In fact in lac z breaks down lactose into glucose and galactose in absence of glucose.
Hence, option D is correct
Unit cell: The simplest arrangement of atoms or molecules that regularly repeat in a crystal structure
Crystal lattice: A crystal lattice is a three dimensional atomic structure for the solid phase of matter.
Characteristics of a crystal lattice include
Symmetrical and infinitely repeating arrangement of atoms
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Viral infection can be asymptomatic (latent) or can lead to cell death (lytic infection). The life cycle begins with the penetration of the virus into the host cell. Next, the virus is uncoated within the cytoplasm of the cell when the capsid is removed.
Answer:
The primary function of the respiratory system is to deliver oxygen to the cells of the body's tissues and remove carbon dioxide, a cell waste product. The main structures of the human respiratory system are the nasal cavity, the trachea, and lungs.
Explanation:
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Answer:Cholesterol helps to restrict the passage of molecules by increasing the packing of phospholipids. Cholesterol can fit into spaces between phospholipids and prevent water-soluble molecules from diffusing across the membrane.
Explanation:
