What does the pyrene-actin polymerization assay specifically measure?

TLS Online TPP Program

#Question id: 15637

#Unit 13. Methods in Biology

You have isolated two mutations in the Lac operon that cause constitutive expression of Lac genes. You designate these mutants Lac1– and Lac2–. Making use of an F' that carries the Lac operon with the LacY gene mutated, you construct strains that you test for both ß-galactosidase activity and Lac permease activity with results shown below.

     

Classify each mutation as dominant or recessive and as cis- or trans-acting, giving the experimental result that allows you to arrive at each conclusion. Finally, deduce what type of Lac mutation best fits the properties of Lac 1– and of Lac 2–.

TLS Online TPP Program

#Question id: 2685

#Unit 2. Cellular Organization

There are about 3 billion chemical base pairs in human DNA. Approximately what percent of these base pairs actually code for genes?

TLS Online TPP Program

#Question id: 1279

#Unit 4. Cell Communication and Cell Signaling

A tight junction is made up of which of the following proteins?

a. tricellulin                                                     b. occludin

c. claudin                                                         d. connexins

TLS Online TPP Program

#Question id: 6601

#General Aptitude

A	M	B	N
R	C	S	D
E	U	F	?

TLS Online TPP Program

#Question id: 4913

#Unit 8. Inheritance Biology

Which one of the following statements is INCORRECT about cytoplasmic inheritance?