Rho-independent terminators, also called intrinsic terminators because they need no other factors to work, consist of two sequence elements: a short-inverted repeat (of 20 nucleotides) followed by a stretch of about eight A:T base pairs.

TLS Online TPP Program

#Id: 1760

#Unit 4. Cell Communication and Cell Signaling

Self-tolerance involving both the elimination of immune cells that can react against self-antigens and active inhibition of immune responses.

TLS Online TPP Program

#Id: 774

#Unit 3. Fundamental Processes

RNA polymerase starts most transcripts with an A (75%) or G

TLS Online TPP Program

#Id: 4943

#Unit 13. Methods in Biology

The chi-squared test helps to determine whether there is a notable difference between the normal frequencies and the observed frequencies in one or more classes or categories.

TLS Online TPP Program

#Id: 4793

#Unit 13. Methods in Biology

Mean = [number of observations]/[total number of observations]

For grouped data, mean is:

TLS Online TPP Program

#Id: 3220

#Unit 4. Cell Communication and Cell Signaling

Direct-acting carcinogens

Highly reactive compounds that can react with and modify nucleotide bases in DNA so as to distort the normal pattern of base pairing