Practice Questions

TLS Online TPP Program

#Question id: 1435

Direct-acting carcinogens are those that:

#Section 3: Genetics, Cellular and Molecular Biology

chemically react with nitrogen and phosphorous atoms in DNA.
work in conjunction with cytochrome P-450 in the endoplasmic reticulum.
are mainly reactive electrophiles.
generally unreactive, often water-insoluble compounds that can act as potent cancer inducers only after the introduction of electrophilic centers.

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TLS Online TPP Program

#Question id: 2289

#Section 3: Genetics, Cellular and Molecular Biology

According to the endosymbiotic theory, which organelles form from engulfing of cyanobacteria

TLS Online TPP Program

#Question id: 2113

#Section 3: Genetics, Cellular and Molecular Biology

Why are lipids and proteins free to move laterally in membranes?

TLS Online TPP Program

#Question id: 150

#Section 2: General Biology

How do the pKa values of an ionizable side chain compare when the amino acid is free versus when it is in a polypeptide chain?

TLS Online TPP Program

#Question id: 2096

#Section 2: General Biology

Movement of phospholipids from one leaflet to the other

TLS Online TPP Program

#Question id: 3002

#Section 2: General Biology

Cells are most sensitive to penicillin during which phase of the growth curve?