Which of the following was an important quality of protocells?a) they had no membrane
b) they were able to self-replicate
c) they were autotrophic

Answers

Answer 1

Answer: Out of the following choices, the most important quality if the protocells is that they were able to self-replicate.

Answer 2

Answer: Being able to self-replicate was an important quality of protocells.

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In certain plants, tall is dominant to short. If a heterozygous plant is crossed with a homozygous tall plant, what is the probability that the offspring will be short? A) 1
B) 1/2
C) 1/4
D) 1/6
E) 0

Answers

The answer is E) 0.

If:
A - dominant allele,
a - recessive allele,

then:
AA - dominant homozygous (tall),
aa - recessive homozygous (short),
Aa - heterozygous (tall).

A heterozygous plant (Aa) is crossed with a homozygous tall plant (AA):

Parental generation: Aa x AA
F1 generation: AA AA Aa Aa

All of the offspring is tall (AA or Aa), since tall is dominant to short.
There is no chance for offspring to be short (aa).

Which factor explains why coal dust is explosive?temperature
surface area
concentration
addition of catalyst

Answers

The answer to the question stated above is surface area.
Coal dusts are fine powdered form of coal, which are formed by crushing, grinding, or pulverizing of coal. They can be created during mining, transportation, or by mechanically handling coal because of its brittle nature.
The surface area of the coal dust explains why it is explosive.

Answer:

surface area

Explanation:

I got it right on Plato.

_______ aid in the immune system to fight infections. A. Red blood cells
B. Platelets
C. Arteries
D. White blood cells

Answers

White blood cells (D) aid in the immune system to fight infections.

Please help

Thank you

Answers

1st change she can make exercise going to the gym lots of running. 2nd change better food choices grains, fruits, fish,chicken,vegetables.

Which structure is represented by the letter C?Choose 1 answer:

(Choice A)
Chloroplast

(Choice B)
Vacuole

(Choice C)
Nucleus

(Choice D)
Mitochondria

Answers

C! I just did cells and their organelles!

Final answer:

Determining which cell structure is represented by 'C' isn't possible without a diagram. However, the listed structures include the Nucleus, Chloroplast among others, with each playing a significant role in cell functionality.

Explanation:

Without the specific diagram, it's difficult to accurately determine which structure is represented by the letter C. However, given the options, the four choices, A) Chloroplast, B) Vacuole, C) Nucleus, and D) Mitochondria, are all essential components to a cell's functionality. The Nucleus acts as the control center of the cell, containing DNA and regulating gene expression. The Chloroplast, on the other hand, is unique to plant cells and is the site of photosynthesis where sunlight is converted into energy for the cell.