What is the superhelical density of a closed-circular DNA with a length of 4,200 bp and a linking number (Lk) of 374? What is the superhelical density of the same DNA when Lk = 412? Are these molecules negatively or positively supercoiled?

A. The molecule is getting negatively supercoiled.

B. The molecule is getting positively supercoiled.

C. The superhelical density is positive.

D. The superhelical density is negative.

Which of the combinations of the above statements are correct?

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#Question id: 24452

#Unit 13. Methods in Biology

The term electrocorticogram (ECoG) is used for the recording obtained with:

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#Question id: 1124

#Unit 4. Cell Communication and Cell Signaling

Which of the following is (are) intracellular second messengers?

a. Ca2+                        b. cAMP          c. epinephrine             

d. protein kinase A      e. protein kinase C

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#Question id: 10885

#Unit 10. Ecological Principles

In a field experiment, autotrophs are provided a 14C-labelled carbon compound for photosynthesis. Radioactivity (14C) levels were then monitored at regular intervals in all the trophic levels. In which ecosystem is the radioactivity likely to be detected in longer time at the higher trophic level?

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#Question id: 11455

#Unit 7. System Physiology – Animal

Statocysts contain cells that are ________.

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#Question id: 28287

#Unit 5. Developmental Biology

the cortical granules containing protein such as___

a) mucopolysaccharides

b) adhesive glycoproteins

c) hyalin protein