Question

Which of the following characteristics make C. elegans a useful model system for biology research? Cell fate map is known Complete genome has been sequenced All neuronal connections are known Short generation time All of the above

Answer 1

1. All the above is the correct answer. - The nematode worm, Caenorhabditis elegans, is either male or hermaphrodite; these are not female. They only have 2 weeks of short life span, that is useful to study their development. For C. Elegans, cell fate specification requires several signal combinations that enable a limited number of "blastomer specification" variables. These activate expression of gene regulatory networks which drive development onwards, leads to activation of factors with respect to "tissue specification." In this analysis, about the C. The embryo elegans was considered an ideal model for research of cell specification. Most of the in the C genes. Elegans genome has functional human variants causing it an extremely beneficial model for viral infections.
2. Pedipalps,Cephalothorax is the correct answer.- The pedipalps are known as the second pair of appendages, and are present per body segment that is on the cephalothorax of Chelecerates.
3. Arthropoda is the correct answer. - Chelipeds are Crab-like, very slender and elongated. They are part of the Phylum Arthropoda.
4. None of the above (all appear during the developement of chordates)- Animals with in phylum chordata exhibit four key features that occur throughout its growth at some stage: a notochord, a hollow dorsal nerve cord, pharyngeal slits and a post-anal tail. The endostyle correlates to thyroid in vertebrates as it appears to produce iodinated, tyrosine molecules in amphioxi, that may also act like hormones because sensory characteristics.
5. They must keep their skin moist for gas exchange is the correct answer. - Initially, it ensures their skin allows them breathe, because oxygen flows through it quickly. Second, it means amphibians are losing a large amount of water through their bodies. This is why so many amphibians are present in wet or moist climates, in which they can conserve the sources of moisture.
6. All of the choices are correct. - Respiratory tree of a see cucumber Holothuroideans are not found in any other group of echinoderms. Respiratory trees are also pumped oxygen by their body aperture by the sea cucumber actively breathing. Not only can they excrete waste from their aperture, but they also extend and contract their muscular body walls at a slow pace that in addition carries water inside and expels it. The sea cucumber fights off the threat while agitated, and vigorously contracts his body wall muscles.