<span>chromatin would be the best answer hope tht helps</span>
Answer:
The pollen grain has apertures on the wall which allow dimensional adjustments in response to changes in moisture conditions. The apertures also offer an exit route for the contents of the grain.
Explanation:
The correct answer is: A checkpoint will be activated if the spindle does not attach to a kinetochore.
Prokaryotes, do not undergo mitosis (like eukaryotes) and therefore have no need for a mitotic spindle. Prokaryotes also don’ t have checkpoints foor the regulation of cell division.
Normal eukaryotic cells (unlike cancer cells), move through the cell cycle in a regulated way in order to make sure that cells don't divide under conditions that are unfavorable for them. Information about their own internal state (nutrients, signal molecules, DNA integrity) is signal to go or not to go through the cell division. Because of that there are few checkpoints in the cell cycle at which the cell examines the signals and makes a “decision”. The major checkpoints are:
• The G1- the first point at which it must choose, once it passes the G1 checkpoint the cell enters S phase
• The G2-the cell checks DNA integrity and checks if replication is done well.
• The spindle checkpoint-at the transition from metaphase to anaphase.
<h3><u>Answer;</u></h3>
D) India was a separate continent until forty-five million years ago.
<h3><u>Explanation</u>;</h3>
- <em><u>Continental drift serves as one of the evidence of evolution. Different kinds of animals and plants live in different parts of the world. This is true now, and it was true in the past. </u></em>
- Therefore, when a fossils of the same animal or plant is found on different continents, then that is evidence that those two continents may have been a single continent when those fossils were formed.
- Fossils show that the continents drifted because similar fossils were found where the continents were together millions of years ago.
Answer:
C,D,,B) The molecule is likely a sugar.
Explanation:
The molecule is(hexose) a glucose.It is a sugar formed as the products of photosynthesis.It is also a carbohydrate because all sugars are CHO,although not all CHO are sugars.It is the smallest components of cell membranes.Protein are the largest components based on molecular mass,while phospholipids are the largest components.
The three major elements in the molecule are Carbon.Hydrogen and Oxygen. The general formula of carbohydrate is Cx(H2O)y. The ratio of hydrogen to oxygen is 2:1.Thus the hydrate refers to the water content.
Sugar as monosaccharide glucose is the simplest form with general molecular formula of (CH2O)n where may be n = 3 to 6. In glucose n=6,and it is called Hexose. Therefore the molecule of glucose is C6H1206 in ratio 1:2:1.
The arrangement of glucose could be in straight chain or ring structure,Hexose sugar of glucose and pentose can be ring structure.They have C-H chain length long enough to form ring structure.
In glucose this can either be alpha or beta ring structure. Therefore the molecule is either the alpha or beta-glucose ring.