#Question id: 5665
#Unit 5. Developmental Biology
Following statements are regarding to cortical granule reaction.
A. To initiating the slow block to polyspermy the release of Ca2+ that occurs when the sperm enters the egg is critical for activating the egg’s metabolism and initiating development
B. Calcium ions release the inhibitors from maternally stored messages, allowing these mRNAs to be translated
C. Calcium ions are not release the inhibition of nuclear division, thereby allowing cleavage to occur.
D. Udx1, the enzyme responsible for the reduction of oxygen to crosslink the fertilization envelope, is also NADPH-dependent
E. The fertilization envelope is elevated from the cell membrane by glycosaminoglycans which provides support for the blastomeres during cleavage
Which of the following combinations are correct?
#Question id: 5666
#Unit 5. Developmental Biology
When the extracellular side of the receptor binds resact, it activates latent guanylyl cyclase in the cytoplasmic side of the receptor. Active guanylyl cyclase causes the sperm cell to produce more cyclic GMP (cGMP), this compound_____
#Question id: 5667
#Unit 5. Developmental Biology
There may be an important connection between sperm translocation and capacitation. Which of the following option is correct explanation of above statement?
#Question id: 5668
#Unit 5. Developmental Biology
Following statements are made in relation to the five widely recognized stages of Arabidopsis embryogenesis:
A. The fusion of haploid egg and sperm takes place in zygotic stage
B. Rapid cell division in two regions on either side of the future shoot apex forms globular stage
C. The cell elongation throughout the embryo axis and further development result in Torpedo stage
D. The embryo loses water and becomes metabolically inactive in the torpedo stage
Which combination of the above statements is correct?
#Question id: 5669
#Unit 5. Developmental Biology
What is the reproductive difference between sea urchins and mammals is?
#Question id: 5670
#Unit 5. Developmental Biology
Embryonic stem cells can be induced in the laboratory to differentiate into muscle, nerve, pancreatic, and other specialized cell types. It has recently become possible to trigger the dedifferentiation of somatic cells back into pluripotent cells (so-called induced pluripotent stem cells or iPS cells) by artificially enhancing the production of a relatively small number of key transcriptional factors known to be required for maintenance of pluripotency. Examples of such transcription factors are OCT4 and NANOG. The production of OCT4 and NANOG (and other key regulatory proteins) is stimulated by a transcription factor known as FOXP1, a member of the Forkhead family of DNA-binding proteins. There are two isoforms of FOXP1.
Which of the following statement regarding to FOXP1 is incorrect?