TLS Online TPP Program

#Question id: 2023


Which of the following is a pathway that would lead to the activation of cytotoxic T cells?

#Unit 4. Cell Communication and Cell Signaling
  1. B cell contact antigen → helper T cell is activated → clonal selection occurs

  2. body cell becomes infected with a virus → new viral proteins appear → class I MHC molecule-antigen complex displayed on cell surface

  3. self-tolerance of immune cells → B cells contact antigen → cytokines released

  4. complement is secreted → B cell contacts antigen → helper T cell activated → cytokines released

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TLS Online TPP Program

#Question id: 533

#Unit 1. Structure and Function of Biomolecules

Glucose, labeled with 14C in different carbon atoms, is added to a crude extract of a tissue rich in the enzymes of the pentose phosphate pathway.  The most rapid production of 14CO2 will occur when the glucose is labeled in:

TLS Online TPP Program

#Question id: 534

#Unit 1. Structure and Function of Biomolecules

If glucose labeled with 14C in C-3 is metabolized to lactate via fermentation, the lactate will contain 14C in:

TLS Online TPP Program

#Question id: 535

#Unit 1. Structure and Function of Biomolecules

In some diabetic patients, glucose increases disproportionately and is unresponsive to an insulin challenge; under these conditions, how would oneʹs liver normally respond?

A) phosphorylating glucose for entry into the glycolytic pathway

B) saturating glucokinase with glucose

C) phosphorylating glucose for entry into the glycogen synthesis pathways

TLS Online TPP Program

#Question id: 536

#Unit 1. Structure and Function of Biomolecules

Glucose 6-phosphate allosterically inhibits

A) hexokinase I.

B) glucokinase.

C) hexokinase II.

TLS Online TPP Program

#Question id: 537

#Unit 1. Structure and Function of Biomolecules

Substrate level phosphorylation

A) describes the conversion of ADP into ATP with the addition of inorganic phosphate every place throughout the cell.

B) describes the formation of ADP by phosphoryl group transfer from 1,3 bisphosphoglycerate.

C) is the formation of ATP by phosphoryl group transfer from a higher energy compound.

TLS Online TPP Program

#Question id: 538

#Unit 1. Structure and Function of Biomolecules

Which of the following statements are correct about cells that form ATP mainly by glycolysis are

A) anaerobic yeasts.

B) lactic acid bacteria.

C) kidney medulla cells.