TLS Online TPP Program

#Question id: 4162


Which statement is false concerning aminoacyl-tRNA synthetase?

#SCPH06 I Botany
  1. It recognizes only one amino acid, but may recognize more than one tRNA.

  2. It requires a conversion from ATP to ADP.

  3. Hydrolysis of pyrophosphate essentially makes its reaction irreversible.

  4. Some synthetases bind the anticodon and others do not.

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TLS Online TPP Program

#Question id: 9280

#SCPH06 I Botany

Oxygen-Evolving Organisms Have two Photosystems that Operate in Series, explain by emerson that is the Photosystem I preferentially absorbs far-red light of wavelengths greater than 680 nm; photosystem II preferentially absorbs red light of 680 nm and is driven very poorly by far-red light; Another difference between the photosystems is that,

a.) Photosystem I produces a strong reductant, capable of reducing NADP+, and a weak oxidant

b.) Photosystem I produces a very strong oxidant, capable of oxidizing water, and a weaker reductant than the one produced by photosystem II

c.) Photosystem II produces a strong reductant, capable of reducing NADP+, and a weak oxidant

d.) Photosystem II produces a very strong oxidant, capable of oxidizing water, and a weaker reductant than the one produced by photosystem I

Which statements would be CORRECT?

TLS Online TPP Program

#Question id: 7302

#SCPH28 | Zoology

Match the following level of microRNAs in Arabidopsis (Column II and III) with their Phases (Column I)

   Phases (Column I)

 microRNAs (Column II)

Level of microRNAs (Column III)

A. Juvenile vegetative phase

i. miR156

a. Low

B. Adult vegetative phase

ii. miR172

b. High

C. Reproductive phase

 

 

Which of the following combination is correct?

TLS Online TPP Program

#Question id: 3014

#I Life Science/ Life Sciences Group – I-V

Regarding prokaryotic reproduction, which statement is correct?

TLS Online TPP Program

#Question id: 3295

#SCPH28 | Zoology

Males of different species of the fruit fly Drosophila that live in the same parts of the Hawaiian Islands have different elaborate courtship rituals. These rituals involve fighting other males and making stylized movements that attract females. What type of reproductive isolation does this represent?

TLS Online TPP Program

#Question id: 14368

#SCPH05 I Biotechnology

10 kg of a pure enzyme (Mr 30 000) catalyses the conversion of 1.5 g of a substrate (Mr 44) to products in 5 minutes. Calculate turnover number (sec^-1)  ....10^5