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1 year ago

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4. Name the dark, linear, thread-like structures that you can see in some of the onion root tip cells. What Biomolecule of hered

ity do they contain

1 answer:

mario62 [17]1 year ago

3 0

So dark linen thread structure is chromosome that we see. And and by molecule heritage that we contain.

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When a cell or organism only has one rony of each chromosomes

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3 years ago

What are the major reservoirs in the carbon cycle

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3 years ago

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3 years ago

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2 years ago

In contrast to growing microtubules, shrinking microtubules ............. Group of answer choices have strong lateral interactio

Otrada [13]

Answer:

have curved protofilaments at their plus ends

Explanation:

Microtubules are polymers of tubulin proteins that function as the cytoskeleton of eukaryotic cells. Microtubules are dynamic structures that can grow and shrink at a rapid rate. During this process, tubulin subunits can associate and dissociate at the plus end of the protofilament. Tubulin subunits bind to two GTP molecules, one of which is hydrolyzed to GDP after assembly. When microtubules are unstable, protofilaments curl outwards because GDP-bound tubulin has a weak affinity (thereby curving it) and disassemble. The dynamic stability of microtubules is regulated by a feedback loop: when microtubules shrink, free tubulin concentration increases and microtubules start to grow. As microtubules grow, free tubulin concentration decreases and the rate of GTP-tubulin addition also decreases.

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2 years ago