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stich3 [128]
3 years ago
14

The tundra is characterized by extremely low temperatures as well as little precipitation, a rocky landscape,and permafrost.beca

use of these physical features, what type of producers would we expect to find in the tundra ?
Biology
2 answers:
Tanzania [10]3 years ago
5 0

Answer:

Linches and low-growing moss

Explanation:

Jlenok [28]3 years ago
4 0
Low shrubs, grasses, reindeer mosses
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In drosophila the anterior-posterior axis is established bya. The distribution of the RNA-binding transcription factor called bi
vova2212 [387]

Complete question:

In Drosophila the anterior-posterior axis is established by

a. The distribution of the RNA-binding transcription factor called bicoid and the protein nanos localized in the anterior and posterior poles of the embryo, respectively

b. The distribution of a gene that codes for an RNA-binding protein called nanos localized in the anterior pole of the embryo and a transcription factor called bicoid localized in the posterior pole of the embryo

c. The distribution of a gene that codes for an RNA-binding protein called nanos localized in the posterior pole of the embryo and a transcription factor called bicoid localized in the anteror pole of the embryo

d. The distribution of the RNA-binding transcription factor called bicoid and the protein nanos localized in the posterior and anterior poles of the embryo, respectively

Answer:

c. The distribution of a gene that codes for an RNA-binding protein called nanos localized in the posterior pole of the embryo and a transcription factor called bicoid localized in the anterior pole of the embryo

Explanation:

When the Drosophila zygote develops, it goes through different stages until it gets to the blastula stage. At this point, there are pole cells that determine the axis of the organism -the anteroposterior and the dorsoventral axis-.

A two hours old embryo has already determined its two axes. A ten hours old embryo has already determined its body segments. And from there, each of them develops a structure that turns to be their identity.

Different genes determine the polarity of the egg.

Dorsoventral genes place in the superior and inferior parts of the egg and determine the development of dorsal and ventral tissues.

The same happens with anteroposterior genes.

  • The BICOID genes place in the <u>anterior part of the egg</u> and activate the hunchback genes that determine the development of the head and the thorax. The Bicoid mRNA distributes in the anterior region of the egg.
  • The NANOS gene reprimes the hunchback genes, which promoted the development of the posterior structures of the body. <u>The Nano mRNA places in the posterior region of the egg, and Nano proteins distribute in this area.</u>

The polarity genes of the egg are genes of maternal effects.

While the bicoid and nano genes are expressed in the ovary, the hunchback gene is expressed in the embryo. This last one is activated or inhibited by the foreign ones.

Bicoid and nano genes gradient regulate the expression of the gap, pair-rule, and segment polarity genes.

7 0
3 years ago
This causes a population to reach its carrying capacity:
Ludmilka [50]
The answer is 2. Exponential growth
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A recipe for sugar cookies calls for an oven to be preheated to 175c, evaluate which of the following answers are the equivalent
Vitek1552 [10]

Answer: 448.15 Kelvin and 347 Farenheit

KELVIN-       175°C + 273.15 = 448.15K

Farenheit-   (175°C × 9/5) + 32 = 347°F

5 0
2 years ago
What does a scientist do if his experiment disproves his hypothesis
UNO [17]
He will try again..?
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What would happen if a planet weren’t in the Habitable Zone?
abruzzese [7]

Answer:

If a planet is too far from its star, water freezes. If a planet is too close to its star, water evaporates. ... For cooler red dwarfs, the Habitable Zone is so close to the star that solar flares and radiation from the star would destroy life. For very hot blue stars, the Habitable Zone is further away.

Explanation:

HOPE I HELPED!?

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