Normal electrocardiograms recorded from the three standard bipolar limb leads (I, II, III). Match the following.

Column I	Column II
a. P wave	i. Positive
b. T wave	ii. Negative
c. R wave
d. S wave

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#Question id: 2650

#Unit 2. Cellular Organization

Lac operon is an example of

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#Question id: 23697

#Unit 13. Methods in Biology

A researcher needs to clone a sequence of part of a eukaryotic genome in order to express the sequence and to modify the polypeptide product. She would be able to satisfy these requirements by using which of the following vectors?

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#Question id: 4484

#Unit 3. Fundamental Processes

Match General Transcription Factors with their functions;

i. TAFs	A. Appears to regulate the binding of TBP to DNA. It does this using an inhibitory flap that binds to the DNA-binding surface of TBP, another example of molecular mimicry. This flap must be displaced for TBP to bind TATA.
ii. TFIIB	B. Insert into the RNA-exit channel and active center cleft of Pol II in a manner analogous to the sigma region 3/4 linker in the bacterial case.
iii. TFIIH	C.  As an ATP-driven translocator of double-stranded DNA.
iv. TFIIF	D. This two-subunit (in humans) factor associates with Pol II and is recruited to the promoter together with that enzyme.

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#Question id: 1916

#Unit 4. Cell Communication and Cell Signaling

 Which of the following is an example of a known oncogenic virus?

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#Question id: 31261

#Unit 4. Cell Communication and Cell Signaling

Most tumors induce the formation of new blood vessels that invade the tumor and nourish it, a process called as: