<span>In a flower , the female sex cells, or eggs, are produced by the ovary . Pollen, which contains the male sex cells, is produced by the male cones or micro spores.</span>
Answer:
(C) Competitive inhibition
Explanation:
When a substrate competes with and inhibitor, what they are actually doing is competing by the active site of the enzyme. In terms of probabilities, when there is much more of one molecule of X than its competitor Y, it is more likely for any of the molecules of X to reach the active site of the enzyme than for any of the molecules of Y.
Then is one would like to reduce the effects of an inhibitor reversible bonded to an enzyme, one possibility is to increase the concentration of a substrate (which in turn means that there will be a higher relative number of its molecules in the media), increasing the probability to meet the active site of the enzyme and as a result displacing the inhibitor (assuming it not increased as well).
Answer:
Phoebus Levene( 1896, Sagor Russia - Septemeber 1940, New York)
Explanation:
These were developed by Phoebus Aaron Theodor Levene ,he was a russian who studied medicine, with keen interest in organic chemistry.
He migrated to the US in 1891, and started practising medicine in 1892.Due to his strong interest in research he combined research(1894) in molecular structure of sugars with medical practice,But this was cut short when he contracted tuberculosis.
Between 1896- 1906,he collaborated with many nucleic acids and protein exoperts e.g Albrecht Kossel and Emil Fischer to wok on the structure of DNA.And headed the Rockefeller Institute for Medical Research.
He works included :the isolation of Nucleotide-monomers of DNA
:the isolation of D-ribose sugar from ribonucleic acid molecule.(RNA)
Discovery of 2-deoxyribonucleic ,
How the components of Nucleotide(phosphate group,sugars, and organic bases) combined to form nucleotide, and how the latter undergo condensation reaction to form DNA.
Answer:
Answer choice:Petroleum
Explanation:
Petroleum (crude oil and natural gas plant liquids): 28% Coal: 17.8%
Answer:
1) Macrophages ingest antigen 2) Helper T cells are activated 3) B cells differentiate into plasma cells and memory cells.
Explanation:
Innate immunity and adaptive immunity provide protection against foreign invaders. Innate immunity is non specific and adaptive immunity is specific immune response; includes the production of antibody after a sequence of events.
- When an antigen enters the body the phagocytic cells such as macrophages and dendritic cells ingest the antigen by a process called as phagocytosis. These cells act as antigen presenting cells and present it to T cells.
- T cells are of two types T helper cells and T cytotoxic cell. T cytotoxic cells killed the affected cell such as affected by virus while T helper cells signal for the production antibodies.
- Antibodies are produced from the plasma cells while memory cells act as record keeping. The plasma cells are stimulated by interleukins.
