Which of the following statements is TRUE of CD4?

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#Question id: 14784

#Unit 13. Methods in Biology

Ten points are marked on a straight line and 11 points are marked on another straight line. If any three points are chosen, what is the probability that it forms a triangle?

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#Question id: 19892

#Unit 12. Applied Biology

Which one of the following sensors detects the nearby objects?

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#Question id: 586

#Unit 1. Molecules and their Interaction Relevant to Biology

At the beginning of an enzyme-catalyzed reaction the ________ is negligible.

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#Question id: 5969

#General Aptitude

The calendar of the year 1897 can be used again in the year?

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#Question id: 14904

#Unit 6. System Physiology – Plant

Cell walls commonly are classified into two major types. This classification is based not on structural or biochemical differences;

A) primary walls and

B) secondary walls

i) walls formed during cell growth

ii) walls that are formed after cell enlargement stops

iii) multilayered walls that are strengthened and waterproofed by lignin

iv) Usually they are thin and simple, but sometimes may be thick and multilayered, such as those found in collenchyma or in the epidermis

v) highly specialized in structure and composition, reflecting the differentiated state of the cell

Which of the following correctly represents features of primary and secondary walls?