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All chromosomes of a cell are directed towards one side and are attached to the nuclear membrane, can be observed in
- Leptotene
- Zygotene
- Pachytene
- Diplotene
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Uploaded on: 11/26/2022
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Practice more questions on Cell: Structure and Functions
Question 1
Easy
Views: 5,771
Question 2
Hard
Views: 5,273
The water vascular system in echinoderms is a unique and defining characteristic that acts as a vital part of whole animal's body. It consists of hundreds to thousands of tubefeets that are found in the ambulacral grooves. Due to this, this system is also called ambulacral system. The water vascular
system controls the tubefeets hydraulically through a complex of fluid-filled canals and reservoirs. In response, tubefeets perform various functions. Echinoderms also possess special structures for respiration.
(i) The ambulacral system is .......... in origin.
(a) ectodermal
(b) mesodermal
(c) coelomic
(d) endodermal
(ii) In echinoderms, tubefeet help in
(a) locomotion and food capture
(b) paralysing the prey
(c) the formation of leucocytes
(d) All of the above
(iii) The respiratory structure in echinoderms is
(a) dermal branchiae
(b) bursae
(c) tubefeet
(d) All of the above
(iv) The haemal system in echinoderms
(a) contains myoglobin pigment
(b) is of open type
(c) contains two-chambered heart
(d) All of the above
(v) Assertion (A) Tubefeet expand or contract due to the hydrostatic pressure within it.
Reason (R) They help to filtere the water that enter the water vascular sytem.
(a) Both and are true and is the correct explanation of
(b) Both and are true, but is not the correct explanation of
(c) is true, but is false
(d) Both and are false
Question 3
Medium
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A. Blood conc. of glucose in a normal healthy man is 4.5 to 5.0 mM
B. In proteins only left handed helices are observed
C. The pitch of B- DNA is 3.4 Angstrom
D. At each step of ascent the strand of DNA turns 36 degree
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| Question Text | All chromosomes of a cell are directed towards one side and are attached to the nuclear membrane, can be observed in |
| Updated On | Nov 26, 2022 |
| Topic | Cell: Structure and Functions |
| Subject | Biology |
| Class | Class 11 |
| Answer Type | Video solution: 1 |
| Upvotes | 78 |
| Avg. Video Duration | 2 min |
