What B represents as shown in figure

TLS Online TPP Program

#Question id: 15003

#Unit 8. Inheritance Biology

Laurie met her husband Jim at a support group for families dealing with PKU (phenylketonurea), a recessive genetic disorder. Laurie and Jim both have one sister who is affected with PKU and no other family history of the disorder. They come to you as a genetic counselor to ask what their risk is of having an affected child. What do you tell them?

TLS Online TPP Program

#Question id: 15678

#Unit 2. Cellular Organization

Alcohols are among the most widely used disinfectants and antiseptics. They act by 

TLS Online TPP Program

#Question id: 8692

#Unit 9. Diversity of Life Forms

Which of the following statements is accurate with regard to a phylogeny, as represented by a phylogenetic tree?

TLS Online TPP Program

#Question id: 30105

#Unit 1. Molecules and their Interaction Relevant to Biology

Methotrexate is an inhibitor of dihydrofolate reductase. Administration of methotrexate would inhibit:

1. de novo synthesis of UMP.

2. conversion of dUMP to dTMP.

3. conversion of IMP to GMP.

4. de novo synthesis of IMP

TLS Online TPP Program

#Question id: 1140

#Unit 4. Cell Communication and Cell Signaling

Cell sensitivity to an external signal is determined by: