GATE BT exam:gate PYQs & Answers — Page 43

Questions 421–430 of 650. Imported answers require independent review unless marked reviewed.

The number of molecules of a nucleotide of molecular weight 300 g/mol present in 10 picomoles is ____________ × 10¹² (round off to 2 decimal places).

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To facilitate mass transfer from a gas to a liquid phase, a gas bubble of radius

is introduced into the liquid. The gas bubble then breaks into 8 bubbles of equal radius. Upon this change, the ratio of the interfacial surface area to the gas phase volume for the system changes from

. The value of

is ____________.

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The largest eigenvalue of the matrix

is ____________.

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A normal random variable has mean equal to 0, and standard deviation equal to 3. The probability that on a random draw the value of this random variable is greater than 0 is ____________ (round off to 2 decimal places).

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A variable Y is a function of t. Given that Y(t = 0) = 1 and Y(t = 1) = 2,

in the interval

can be approximated as ____________.

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A block of ice at 0 °C is supplied heat at a constant rate to convert ice to superheated steam. Which one of the following trajectories correctly represents the trend of the temperature of the system with time? Assume that the specific heat of H₂O is not a function of temperature.

Your answerChoose one option.

Diagram for Biotechnology question 26 (figure 2)

Diagram for Biotechnology question 26 (figure 3)

Diagram for Biotechnology question 26 (figure 4)

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The DNA sequence shown below is to be amplified by PCR:

5′ GCTAAGATCGAATTTC…..TTGGCAATAGTAGCGC 3′ 3′ CGATTCTAGCTTAAAG…..AACCGTTATCATCGCG 5′

Which one of the following pair of primers can be used for this amplification?

Your answerChoose one option.

5′ GGAATTCAGATCTAG 3′ and 5′ TGGCAATAGTAGCGC 3′

5′ GCTAAGATCGAATTTC 3′ and 5′ CGCTATTACCGTTA 3′

5′ GGAATTCAGATCTAG 3′ and 5′ CGCTATTACCGTTA 3′

5′ GCTAAGATCGAATTTC 3′ and 5′ TGGCAATAGTAGCGC 3′

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Which of the following statements about immune response are CORRECT? [P] T cells are activated by antigen-presenting cells [Q] Foreign peptides are not presented to helper T cells by Class II MHC proteins [R] Dendritic cells are referred to as professional antigen-presenting cells

Your answerChoose one option.

P and R only

P and Q only

Q and R only

P, Q and R

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Which of the following statements are CORRECT about eukaryotic cell cycle?

[P] CDKs can phosphorylate proteins in the absence of cyclins

[Q] CDKs can be inactivated by phosphorylation

[R] Degradation of cyclins is required for cell cycle progression

[S] CDKs are not involved in chromosome condensation

Your answerChoose one option.

P and R only

P and S only

P, Q and R only

Q and R only

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W, X and Y are the intermediates in a biochemical pathway as shown below:

S ⋯→ W → X → Y → Z

Mutants auxotrophic for Z are found in four different complementation groups, namely Z1, Z2, Z3 and Z4. The growth of these mutants on media supplemented with W, X, Y or Z is shown below (Yes: growth observed; No: growth not observed):