Biology Questions
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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