Following statements are regarding to the mechanism of migration of pollen tube.

A. The embryo sac is the product of three mitotic divisions of the diploid megaspore; it comprises seven cells and eight haploid nuclei.

B. The two polar nuclei in the central cell will fuse with the second sperm nucleus and produce the endosperm that will nourish the egg. The other six cells, including the egg, contain one haploid nucleus each.

C. After compatible pollen germinates, the pollen tube grows toward the micropyle.

D. The three cells from the pollen are connected to one another at the tip of the tube, and waves of sodium ions play a key role in the growth of the tube.

Which of the following combinations are correct?

TLS Online TPP Program

#Question id: 28760

#Unit 2. Cellular Organization

Pex5 is a receptor which binds with peroxisomal-targeting sequence proteins in the cytosol that protein targeted into the peroxisomal matrix by forming a multimeric complex with the Pex14 receptor located on the peroxisomal membrane. After assembly, the matrix protein dissociates from Pex5 and Pex5 is then returned to the cytosol by which process?

TLS Online TPP Program

#Question id: 28761

#Unit 2. Cellular Organization

Which of the following characteristics are TRUE for Lysosomes ?

a) Is a membrane-enclosed organelles

b) Is Filled with hydrolytic enzymes all are acid hydrolases 

c) Acid hydrolases they need to be activated by proteolytic cleavage

d) Work best at acidic pH

TLS Online TPP Program

#Question id: 28762

#Unit 2. Cellular Organization

For optimal activity, of lysosomal acid hydrolases they need to be___

a)Activation based on sensitivity to cleavage by endoglycosidase-D

b)Activation by proteolytic cleavage

c)Requires an acid environment

TLS Online TPP Program

#Question id: 28763

#Unit 2. Cellular Organization

Lysosome an interior pH of about_____

TLS Online TPP Program

#Question id: 28764

#Unit 2. Cellular Organization

Which of the following organelles membrane proteins, are highly glycosylated in compared to other organelles, which helps to protect them from the proteases?

TLS Online TPP Program

#Question id: 28765

#Unit 2. Cellular Organization

Which class of H+ ATPase in the lysosomal membrane, pumps H+ into the lysosome and maintaining its lumen at an acidic pH?