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ZanzabumX [31]
3 years ago
13

What cover the nucleus of a cell

Biology
2 answers:
bija089 [108]3 years ago
8 0

Answer:

The nuclear membrane or nuclear envelope which is a double lipid bilayer

professor190 [17]3 years ago
8 0

Answer:

Nuclear Envelope

Explanation:

The nucleus is covered by the nuclear envelope, which is a double membrane that protects DNA both physically and chemically.

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A cell has a defect in its receptor for growth factors, preventing growth factors from attaching to and signalling the cell. Bas
morpeh [17]

Answer:

Option B

Explanation:

B. The cell will grow uncontrollably and continue to divide as long as it has food.

Cell growth is theeoretically stimulated by the binding of growth factors to their receptors using signaling pathways.

These pathways are regulated by proteins which are encoded for in the genes.

The gene that controls the regulation of these pathway when mutated produce malfunctioning signaling protein thus not allow for regulations of the cell cycle causing uncontrollable cell division. These mutated genes are called oncogenes.

4 0
3 years ago
Why will many species of bird migrate to warmer climate during the winter
Doss [256]
Bird migrations began with the recession of the glaciers during the ice age. You will notice a great increase in insects in the spring time and early summer.The birds moved North to take advantage of this increase in the food supply that followed the warming in the spring and early summer. Their reproductive organs temporarily developed so they could lay eggs and raise a family. Look at the early flush of Night crawlers in the moist times of the early rains. By mid summer most of the insects have matured, mated and died. Their eggs have hatched and turned to larva and moved underground until next spring. The shortening of the days causes the reproductive functions to decrease and signals the birds that the food will soon become scarce. They move back to the area that makes it the easiest to find food and avoid freezing. which of course is the warmer climates nearer the equator. Not all birds move past the Tropics at approximately 30 degrees. Some like Chickadees may move down from Mi or Mn or Canada only as far south as Indiana. Some migrations may be quite short. For example from the mountains down to the plains. They don't generally reproduce in the warmer winter climes they migrate to. In the spring time they migrate along paths of the retreating glaciers. As the climate warms away from the tropics the birds follow the emerging insects etc to the birds selected breeding grounds.with increased insects and longer days to feed the hatching's. It is necesary to understand why they move to cooler climates in the summer to under stand why they move to eh warmer ones in the fall. As the days shorten the food supply dwindles and the babies have fledged. They move to warmer climates in winter to rest and refuel for the next years migration.
8 0
3 years ago
When Mendel crossed true–breeding pea plants that have inflated pods (PP) with those that have constricted pods (pp), it was obs
Elena-2011 [213]
It is the first choice, since that (P) is dominant to (p) so yeah Pp will be inflated
6 0
3 years ago
HELP! NO LINKS OR IRRELEVANT TOPICS! PLEASE DON'T WASTE MY POINTS!
nadezda [96]

Answer:

South China and the U.K.

7 0
2 years ago
Which of the following statements concerning the enzyme, telomerase, is true? (Select all that apply.) A) Telomerase removes tel
Bad White [126]

Answer:

B) Telomerase is a ribonuclear protein containing a section of RNA complementary to the telomeres

C. telomerase is reactivated in cancer cells, contributing to their immortality

Explanation:

  • Telomerase elongates telomere ends
  • Telomerase binds to a RNA molecule containing  a sequence complementary to the telomeric repeat.
  • Telomerase is usually not active in somatic cells but is active in cancer cells- the protein acts to extend the shortened telomeres in these cells preventing them from dying
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