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2 years ago

Describe how plant cells keep themselves rigid. Word Count: of 125

1 answer:

4 0

Las paredes externas de una casa o un automóvil brindan una barrera fuerte e inflexible que protege a sus habitantes humanos de un mundo externo rudo e impredecible. Podría esperarse que el límite externo de una célula viva estuviera construido de una barrera igual de fuerte e impenetrable porque también debe proteger su delicado contenido interno ante un ambiente no vivo y a menudo inhospitalario. Sin embargo, las células están separadas del mundo externo por una estructura delgada y frágil llamada membrana plasmática que sólo mide 5 a 10 nm de espesor. Se requerirían casi 5 000 membranas plasmáticas apiladas una sobre otra para igualar el grosor de una sola página de este libro.

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Vinegar , HCI, HS204 are examples of

g100num [7]

They are examples of Acids

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3 years ago

A scientist claims that after the first single-celled organisms formed on Earth, conditions would not sustain multicellular orga

hoa [83]

Answer:

A.Earth's early atmosphere lacked oxygen, which multicellular organisms need to break apart food

Explanation:

One important feature that led to the development of multicellular organisms was the rise of oxygen-producing photosynthetic bacteria. Prior to this development, the unicellular organisms (anaerobes) then present on Earth obtained energy from inorganic fuels.

However, with the presence of oxygen in the atmosphere, a shift was observed as organisms that could obtain energy from the reduction of energy became predominant. This unicellular aerobes later paved way for the evolution of multicellular aerobes.

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3 years ago

What is the significance of Easter for Christians?

max2010maxim [7]

Answer:

it is c

Explanation:

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3 years ago

Read 2 more answers

The horticulturalist crosses two geraniums from the f1 generation. look at the punnett square to see this cross. what ratio of r

Naddik [55]

Hi,

In Geranium plants red flowers is given by the allele R that is dominant (so RR or Rr ) genotype will produce red flowers.

If we talk about the attached punnet square which i took from the exercise book, you can see that there was a cross made between two plants with heterozygous genotype for red flowers.

P1: Rr X Rr

Gametes: R: r : R : r

F1: RR: Rr: Rr: rr

so there is 3: 1 in F1 offspring for red to white flowers.

Now the question is about f2 generation, when we cross F1 generation suppose we do a cross of Rr and rr from F1 generations let us see what happens.

F1: Rr: rr

Gametes: R: r: r: R

F2 : Rr : rr: Rr: rr

Rr: Red flowers

rr: White flowers:

So the ratio in F2 generation will be 2 red : 2 white. Please see attached punnet squares (first one for question) and the second one of F1 cross for better understanding.

Hope it help!

5 0

3 years ago

Most reactions in the body occurs too slowly to sustain life. this is because

ANTONII [103]

Most reactions in the body occur too slowly to sustain life. This is because MANY REACTIONS REQUIRE LARGE INPUTS OF ACTIVATION ENERGY.

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4 years ago