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elena-14-01-66 [18.8K]
3 years ago
14

example of a fossilized organism that has been found from the late Precambrian and contains cyanobacteria?

Biology
1 answer:
Alex_Xolod [135]3 years ago
6 0

Answer:

Mats of algae called stromatolites.

Explanation:

Example of a fossil organism that has been found from the late Precambrian period is stromatolites. stromatolites are layered sedimentary formations that are produced by photosynthetic cyanobacteria. These cyanobacteria produces adhesive compounds that joins sand and other rocky materials in order to form mineral called “microbial mats”.

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The cell cycle is the regular sequence of growth and division that cells undergo.<br> True or false?
SVETLANKA909090 [29]

Answer:

True

Explanation:

The regular sequence of growth and division that cells undergo is known as the cell cycle. During the cell cycle, a cell grows, prepares for division, and divides into two new cells, which are called “daughter cells.” Each of the daughter cells then begins the cell cycle again.

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3 years ago
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A teacher asked her students to transcribe a DNA sequence into a complementary RNA strand. She gave the students the following D
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student 4 bcoz thymine is replaced by uracil in RNA

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What has to happen before mitosis begins?
Leokris [45]

Mitosis is simply a stage in a cells life cycle, which could be broken down further into stages of mitosis. The rest (so not mitosis) is know as Interphase and is where the cell does its normal function, so if it's the cell is in a region of muscle it would contract/relax as normal etc.

Immediately before mitosis (or M phase) is what's know as G2 phase, where the G stands for growth and is where particular gene pathways are expressed to promote growth of the volume of DNA (chromosomes are duplicated, so from 46 to 92). At the end of this stage is a checking process where the DNA is scrutinised for any errors, if all is okay then the cell can proceed to mitosis, if not then the process is stopped so that errors in copying the DNA can be fixed. This is know as a restriction point and the cell must meet the requirements to pass. This is often seen as a way cells can prevent damage being replicated and therefore interfering with normal cell processes. When cells are cancerous they are able to override this and therefore divide and spread the damaged DNA.

5 0
3 years ago
When two species are forced to interact in a particular environment, how would relationships of competition, predation, and mutu
cupoosta [38]

Answer:

Please find how the population will be affected by each interaction below

Explanation:

1.) Competition: Competition is a kind of interaction which harms both of the organisms involved. It is caused when organisms of different species share the same resource in an ecosystem. Competition between species of two populations will cause BOTH POPULATIONS TO BE AFFECTED.

2.) Predation: Predation is another kind of interaction in which one organism called the PREDATOR feeds on another organism called PREY. The populations of one species will PREY on the population of the other species, hence, one population will be affected.

3) Mutualism is the interaction between organisms in which both species benefit from one another. Hence, the population of the two species are affected POSITIVELY by this interaction.

4 0
3 years ago
2. Name a microbe that lacks a cell wall and would find hypotonic environments detrimental.
Alina [70]

Answer:

I so I am also a bit confused, but I hope this could answer your question!

Explanation:

The bacteria possess a cell wall composed of peptidoglycan molecule formed by the amino acids called murine.  The bacterial cell wall helps in the survival of the bacteria in some extreme condition like when placed in a hypotonic solution.

The hypotonic solution is formed when it has low solute concentration and high water amount when compared. When the bacterial cell will be placed in hypotonic solution then the water will move inside the cell down the concentration gradient as a result of which the bacterial cell will swell but will not burst.

This happens as the cell wall contains expansin protein which allows the cell wall to expand and provides rigidity to the cell.

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3 years ago
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