TUESDAY, January 7 2018-IN CLASS (a) Nucleosomes (b) Lysosomes c) Peroxisomes (d
ID: 191193 • Letter: T
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TUESDAY, January 7 2018-IN CLASS (a) Nucleosomes (b) Lysosomes c) Peroxisomes (d) Endosomes 20 The cytoskeletorn direct or eton provides support, structure, motility, and organization, and it forms tracks to ickesleand vesicle transport. Which of the cytoskeletal elements listed below is the (a) actin filaments (b) (c) (d) microtubules intermediate filaments none of the above (all the same thickness) 21 Scientists learned that cell death is a normal and even important part of life by studying the development of the nematode worm C elegans. What was the most important feature of C elegans for the study of programmed cell death? (a) The nematode is smaller and simpler than the fruit fly. (b) 70% of C. elegans genes have homologs in humans. (c) The developmental pathway of each cell in the adult worm was known. (d) Its genome was partially sequenced 22 Biologists cannot possibly study all living species. Instead, they try to understand cell behavior by studying a select subset of them. Which of the following characteristics are useful in an organism chosen for use as a model in laboratory studies? (a) amenability to genetic manipulation (b) ability to grow under controlled conditions (c) rapid rate of reproduction (d) all of the above Brewer's yeast, apart from being an irreplaceable asset in the brewery and in the bakery, is an experimental organism used to study eukaryotic cells. However, it does have some limitations. Which of the processes below cannot be studied in yeast? (a) DNA replication (b) cell motility (c) exocytosis (d) cell division 23 This type of animal is the most abundant of all Drosophila melanogaster is a/an animal species, making it an appropriate choice as an experimental model. (a) insect 24 (b) bircd (c) amphibian (d) mammal Zebrafish (Danio rerio) are especially useful in the study of early development because their embryos (a) are exceptionally large. (b) develop slowly. (c) are transparent 5Explanation / Answer
Ans- 20- microtubules
Microtubules are composed of the protein tubulin and whose main function is to help support and give shape to the cell, these are the major elements of the cytoskeleton.
Ans-21-The developmental pathway of each cell in the adult worm was known
It develops from an embryo (sperm + egg) to adult using developmental processes (differentiation & proliferation).
Ans-22-all of the above
Ans-23-cell motility
Because Yeast is a non motile eukaryotes.
Ans-24-insect
Drosophila also called fruit fly is a insect which belongs to the family Drosophilidae.
Ans-25-they are transparent
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