ANSWER: Primary succession
Answer: Option E.
All of the above.
Explanation:
Streptococci pyogenes is a disease caused by streptococci bacteria. These bacteria are gram positive ,non sporeforming and non motile.
The virulence factors are substance produced by bacteria to ensure their effective attack.
The virulence factors of S. Pyogenes are;
Spiky M proteins and lipoteichoic acids which they use as attachment to host organisms.
Hyaluronic capsule which the use to slow or inhibit phagocytosis.
Polysaccharide cell wall which causes the rash of scarlet fever.
Answer:
a regulatory protein binds to DNA which blocks transcription
Explanation:
Negative control of gene expression includes the binding of certain regulatory proteins to the regulatory sequences. This binding prevents the expression of certain sets of the gene. For instance, binding of repressor protein to the operator sequence of lac operon prevents the expression of structural genes of the operon. This pattern of gene regulation is called negative regulation. The binding of the repressor to the operator sequence does not allow the RNA polymerase to transcribe genes since the operator and promoter (binding site for RNA polymerase) sequences are present in close vicinity.
<span>Science knowledge relies on experimental and observational confirmation. Where data is incomplete, new or improved data may well lead to revision of accepted science explanations. In situations where observations are fragmentary, it is normal for scientific ideas to be incomplete, but this is also where the opportunity for making advances may be the greatest.The core ideas of science have been subjected to a wide variety of confirmations and are therefore unlikely to change in the areas in which they have been tested. </span><span>Science knowledge may change due to the development of new techniques for observing investigations (including new technologies), and also through new ways of thinking or framing the questions asked.</span>