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vitfil [10]
3 years ago
10

What is the correct sequence of these events, from earliest to most recent, in the evolution of life on Earth?origin of mitochon

driaorigin of multicellular eukaryotesorigin of chloroplastsorigin of cyanobacteriaorigin of fungal/plant symbioses
Biology
1 answer:
Veseljchak [2.6K]3 years ago
5 0

Answer:

Origin of cyanobacteria

Origin of chloroplasts

Origin of mitochondria

Origin of multicellular eukaryotes

Origin of fungal/plant symbioses.

Explanation:

At first, all living things on Earth were simple, single-celled organisms like archae and bacteria

Later, the first multicellular organisms evolved where photosynthesis led to a buildup of its waste oxygen, in the atmosphere, leading to the great oxygenation event.

Eukaryotes (complex cells with organelles) diversification accelerated when they started using oxygen for their metabolism.

Sexual reproduction, which involves the fusion of male and female reproductive cells to form a zygote in a process called fertilization is, in contrast to asexual reproduction, the primary method of reproduction for the vast majority of macroscopic organisms, including almost all eukaryotes which includes animals and plants etc, and after that, Earth's biodiversity greatly increased.

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Why does exposure to high temperatures cause an enzyme to lose its biological properties?
Ivanshal [37]

Answer:

Shape of active site changes that's why

Enzymes are affected by temperature. So, as temperature increases, enzymes activities also increases, till optimum temperature is reached. If it goes above the optimum temp, the enzymes becomes denatured or can't function anymore due to change in its active site.

6 0
2 years ago
Interpret the Punnett square. A Punnett square with four rows and four columns. The first row is labeled big-A, big-B. The secon
Naddika [18.5K]

Answer:

The genotypes shown represent gametes. False

One of the possible offspring genotypes is AABB. True

The parent genotypes are ABAbaBab×ABAbaBab. True

The parent genotypes are ABAbaBab×ABAbaBab. True

This cross shows two alleles for two traits. True

The gametes are diploid and the offspring are diploid. False

The genotypes shown are correct for a dihybrid cross. True

Explanation:

║ AB ║ Ab ║ aB ║ ab

AB║ABAB ║ ABAb║ABaB║ABab

Ab║ AbAB║ AbAb ║AbaB║Abab

aB║aBAB ║ aBAb ║aBaB║aBab

ab║abAB ║ abAb ║abaB ║abab

Drawing the Punnett square we can deduce that the genotypes shown do not represent gametes because there are more than 2 pairs of chromosomes.

As shown in the second column second row of the Punnett square one of the possible genotypes is AABB, it is distributed different (ABAB) but it is the same possible genotype.

The parents' genotypes are the ones that are written in the first columns and first row, they coincide with the ones in the statement.

A dihybrid cross shows the cross between two genes that have different traits.

The gametes are always haploid and the offspring are diploid because the two gametes come together.

7 0
3 years ago
 “The outer energy levels are full, but that doesn’t mean the inner ones are,” says a friend. How would you respond?
Anton [14]

He is WRONG

Explanation:

Any atom at the ground state has its orbital levels fill from the bottom (close to the nucleus) – up. The inner orbitals are of lower energy state and fill first because the atoms ‘likes’ to exist in the low energy and more stable state. Only when the atom is in an excited state do some of the electrons in the lower orbital levels shift to higher unfilled orbitals.

3 0
3 years ago
Which structure inside a cell makes proteins? *
Sedbober [7]
Ribosomes make proteins inside a cell.
8 0
3 years ago
Which phylum has members that secrete a hard, calcium carbonate shell?
otez555 [7]

Answer:

i believe your answer would be Mollusca.

Explanation:

(i looked it up on britannica if you have any questions.) Mollusk, also spelled mollusc, any soft-bodied invertebrate of the phylum Mollusca, usually wholly or partly enclosed in a calcium carbonate shell secreted by a soft mantle covering the body.

8 0
3 years ago
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