Question

true n false

33. Atomic force and scanning tunneling microscopes can magnify in the hundreds of millions and possibly a billion times, but are limited to surfaces.

34 Many trillions of transgenic organisms have been made by man , for example Bt corn.

37. Most known bacteria have a few thousand genes although a few have less than 160 .

38. Man has around 18,000 genes which is more than found in most organisms..

Answer 1

33) The statement is false.

Explanation: Scanning tunneling microscope (STM) can work on varied surface such as air, water, liquids, gas, in vacuum even in very high or low temperature. It has good resolution in nanoscale. By using atomic force microscope we can image materials that are electrically non-conductive. Thus, given statement is false as STM can work in varied surfaces & it has good resolution in nanoscale.

34) The statement is false.

Explanation: According to a study the number of estimated species on Earth is about 8.7 million. So, it is impossible that humans had produced many trillions of transgenic organisms. Thus the given statement is false.