- how to rescue an expected ventralised embryo (due to UV radiation)?
- The blastocyst stage in mammal ambroys constis of ...A) blastocoel, yolk, cell massB) epiblast, hypoblast, viceral endoderm C) parietal endoderm, knot, trophectoderm D) trophectoderm, inner cell mass
- The compaction of teh mouse embryo is a prerequisite for ...A) formation of left-right asymmetryB) further cleavageC) differentiation in trophectoderm and inner cell massD) formation of the primitive streak
- What are growth strategies of vertebrates?A) cell growth, proliferation, extracellular depositsB) formation of liquid-filled cavitiesC) proliferation, cell growth, cell elongationD) cell propagation, proliferation, intracellular deposits
- The A-P axis in mouse is determined by ...A) gravity B) the anterior visceral endodermC) the position of the allantoisD) the axis between epiblast and hypoblast
- Cell-cell adhesion relies on the interaction of ...A) integrins with fibronectin B) cadherins C) cell membrane D) parakrine factors
- During which phase in life does a frog resemble a mammal most?A) blastula B) phylotypic stageC) holoblast D) gastrula
- The main function of the cortical rotation is ...A) redistribution of maternal factorsB) formation of the grey crescentC) formation of the anterior-posterior axisD) formation of the Spemann-Mangold organizer
- In chicken, gravity induces A-P axis through ...A) blastocoel formationB) separation of egg white and egg yolkC) rotation in the oviductD) separation of endo- and epiblast
- After cleavage in zebrafish follows ...A) the 14-somite stageB) the sphere stageC) the embryonal shieldD) the gastrula
- In frog, the sperm entry site defines ...A) the anterior-posterior axis B) the dorsal-ventral axis C) the animal-vegetal axis D) the right-left axis
- Which animals belong to the amniota?A) chicken; zebrafish; frogB) chicken; mouse; crocodile C) mouse; zebrafish; chicken D) Drosophila, C. elegans, chicken
- In which order do the 3 axes form in a chicken?A) dv;ap;rlB) ap;dv;rlC) ap;rl;dvD) all axes form simultaneously
- The primitive streak in mouse and chicken is equivalent to ... in amphibia.A) blastopore B) blastocoelC) neural tube D) archenteron
- Which organs develop from mesoderm?A) heart; kidney; muscleB) kidney; muscle; liverC) liver; brain; heartD) heart; liver; muscle
- Cleavage is ...A) meiotic division B) normal cell divisionC) cell division without growth D) cell division without replication
- Which statement correctly describes the relationship between genotype (G) and phenotype (P)?A) G and P describe organisms through different parametersB) P is the consequence of the gentic information of a cell.C) Genes of a cell determine G, which directly determines PD) G determines the proteome and proteins determine P
- Prerequisite of a juxtacrine signal is ...A) competenceB) a ligand C) a receptor and a ligandD) direct cell-cell contact
- The dark pigmented side of a Xenopus egg is called ...A) vegetalB) animal C) posteriorD) dorsal
- Outcome of gastrulation is ...A) formation of the neutral tube B) formation of cavities C) formation of germ layersD) formation of the CNS