Practice Questions

TLS Online TPP Program

#Question id: 7120

Which of the following is the only true statement regarding compaction in the mouse embryo?

#Unit 5. Developmental Biology

Compaction involves the activation of cadherins, resulting in an increase in cell-cell adhesion among the 8 cells of the embryo.
Compaction involves a polarization of the cells of the embryo, such that ions can be pumped from the outer surface of the embryo into the central cavity, resulting in an influx of water into the central cavity and formation of the blastocoel.
Compaction gives subsequent cell divisions an orientation, such that cell divisions that occur tangential (parallel) to the cell surface will result in one cell being inside the embryo, where it can contribute to the inner cell mass.
All of the above are true of compaction in the mouse embryo.

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TLS Online TPP Program

#Question id: 29439

#Unit 6. System Physiology – Plant

Nitrogenase, a complex metal containing enzyme is involved in conversion of N2 to NH3•

a. Nitrogenase is composed of two component proteins

b. Nitrogenase is a complex consisting of the MoFe protein (dinitrogenase or component I) a heterotetramer

c. Nitrogenase is a complex consisting of the MoFe protein (dinitrogenase or component I) a heterotetramer

d. Fe protein (dinitrogenase reductase or component II) a heterodimer

Which of the combination of above statement about Nitrogenase is INCORRECT

TLS Online TPP Program

#Question id: 29440

#Unit 6. System Physiology – Plant

Nitrogenase is a complex consisting of the

(a) MoFe protein (dinitrogenase or component I) a heterotetramer

(b) the Fe protein (dinitrogenase reductase or component II) a heterotetramer

(c) MoFe protein (dinitrogenase or component I) a homodimer.

(d) the Fe protein (dinitrogenase reductase or component II) a homodimer

Which of the following is correct

TLS Online TPP Program

#Question id: 29440

#Unit 1. Molecules and their Interaction Relevant to Biology

Nitrogenase is a complex consisting of the

(a) MoFe protein (dinitrogenase or component I) a heterotetramer

(b) the Fe protein (dinitrogenase reductase or component II) a heterotetramer

(c) MoFe protein (dinitrogenase or component I) a homodimer.

(d) the Fe protein (dinitrogenase reductase or component II) a homodimer

Which of the following is correct

TLS Online TPP Program

#Question id: 29441

#Unit 6. System Physiology – Plant

Nitrogenase is a complex consisting of the MoFe protein Fe protein,

Here few of the statement are given regarding Fe protein is given

(a) contains 2 identical subunits (dimer) – nif H

(b) Each subunit has MW of 30 ~ 72 kD.

(c) Each subunit contains an Fe-S cluster (4Fe and 4S2-).

(d) Each subunit has 2 Mo-Fe-S clusters

Which of the following is true regarding Fe protein

TLS Online TPP Program

#Question id: 29442

#Unit 6. System Physiology – Plant

Some of the following statement are given regarding MoFe protein

(a) 2 pairs of identical subunits (tetramer, nif D & nif K)

(b) A total of MW 180 ~ 235kD

(c) Each subunit has 2 Mo-Fe-S clusters.

(d) MoFe proteins are insensitive to O₂

Which of the following is incorrect

TLS Online TPP Program

#Question id: 29443

#Unit 6. System Physiology – Plant

The nitrogenase enzyme complex has the characteristics listed below

(a) Fe protein is connected to ferredoxin

(b) Fe protein is involved in ATP Hydrolysis

(c) MoFe protein is involved in the oxidation of N2 to NH3

(d) MoFe protein is involved in the reduction of N2 to NH3

Which of the following is true