GATE BT format:mcq PYQs & Answers — Page 24

Questions 231–240 of 389. Imported answers require independent review unless marked reviewed.

Which of the following types of molecules act as biological catalysts? [P] Protein [Q] RNA [R] Phospholipid

Your answerChoose one option.

P and Q only

P and R only

Q and R only

P, Q and R

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Which one of the following media components is used to maintain pH in mammalian cell culture?

Your answerChoose one option.

CaCl₂

MgSO₄

NaCl

NaHCO₃

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Which of the following are energy transducing membranes? [P] Plasma membrane of bacteria [Q] Inner membrane of chloroplasts [R] Inner membrane of mitochondria

Your answerChoose one option.

P and Q only

P and R only

Q and R only

P, Q and R

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Amino acid sequences of cytochrome c and ribulose 5-phosphate epimerase from 40 organisms were chosen and phylogenetic trees were obtained for each of these two protein families.

Determine the correctness or otherwise of the following Assertion [a] and the Reason [r].

Assertion [a]: The two trees will not be identical

Reason [r]: The nature and frequency of mutations in the two families are different

Your answerChoose one option.

Both [a] and [r] are true and [r] is the correct reason for [a].

Both [a] and [r] are true but [r] is not the correct reason for [a].

Both [a] and [r] are false.

[a] is false but [r] is true.

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A microorganism isolated from a salt-rich (salt concentration ~2 M) lake was found to possess diglycerol tetraethers, with polyisoprenoid alcohol side chains, as the major lipid component of its cell membrane. The isolated organism is

Your answerChoose one option.

a planctomycete.

a cyanobacteria.

a unicellular amoeba.

an archaea.

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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):