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.
Answer:
Option A, The animal can only live in Australia
Explanation:
At present the Koala are found in several states of Australia such as
a) Queensland
b) NSW
c) Victoria
d) South Australia
Though the Koala is found on the eucalyptus trees of the temperate rain forest , they are only found in Australian geographies . There are several other place on planet earth where there is rainforest with eucalyptus trees and temperate climate, even though the Koalas are limited to Australia.
Hence Option A is correct.
Answer:
Subpapillary plexus nourishes the dermal papillae and epidermis.
Explanation:
The superficial subpapillary plexus could also be regarded to as superficial plexus
. It is composed of postcapillary venules found at the junction of the papillary and reticular dermis and the lower plexus at the dermal subcutaneous interface. It lies below the dermal papillae, and supplies the capillaries in the dermal papillae. The pink color of skin is mainly due to the blood seen in venules of this plexus.
Texture gradient is the change in size which closer objects have compared to objects farther away. It also involves groups of objects appearing denser or more blurry as they move farther away.
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<span>The answer to the question is C, the one that represents the ratio of their offspring is seventy-five percent have freckles. Since the genotypes of the posterity are FF, Ff, Ff, and ff. Since spots (capital F) are prevailing, and they are in 3 out of 4 of the genotypes, 75% will have spots.</span>
