Given some properties of B-cells, except?

a) They are APCs

b) Have surface marker CD19

c) Antibodies at surface of b cell – IgM, IgE

d) They can express only MHC1

e) Part of Innate immunity

TLS Online TPP Program

#Question id: 5610

#Unit 5. Developmental Biology

The acrosome reaction involves the extension of the acrosomal Process:

TLS Online TPP Program

#Question id: 5611

#Unit 5. Developmental Biology

Which ion play an essential role in pollen tube growth?

TLS Online TPP Program

#Question id: 5612

#Unit 5. Developmental Biology

Outside the egg cell membrane is an extracellular matrix that forms a fibrous mat around the egg and is often involved in sperm-egg recognition. In invertebrates, this structure is usually called the:

TLS Online TPP Program

#Question id: 5613

#Unit 5. Developmental Biology

Female mice with the CD9 gene knocked out are infertile because

TLS Online TPP Program

#Question id: 5614

#Unit 5. Developmental Biology

One difference between the blastula and gastrula stages of development is that

TLS Online TPP Program

#Question id: 5615

#Unit 5. Developmental Biology

The fast block to polyspermy is achieved by: