"what are three examples of signals that cells may receive?"

Describe the stages of photosynthesis. Use the terms thylakoid, light-dependent reactions and light-independent reactions.

KatRina [158]

Photosynthesis in plants occurs in two stages. These stages are known as the light-dependent reactions and the Calvin Cycle.

The first stage of photosynthesis is the light dependent reactions. These reactions take place on the thylakoid membrane inside the chloroplast. During this stage light energy is converted to ATP (chemical energy) and NADPH (reducing power).

The second stage of photosynthesis is the Calvin Cycle. These reactions occur in the stroma of the chloroplast. Energy from ATP and electrons from NADPH are used to convert carbon dioxide into glucose and other products.

7 0

3 years ago

Please help! 25 points:)

ladessa [460]

Answer:

D. IV -> III -> II -> I

Explanation:

Blood enters the heart through two large veins, the inferior and superior vena cava, emptying oxygen-poor blood from the body into the right atrium of the heart. As the atrium contracts, blood flows from your right atrium into your right ventricle through the open tricuspid valve.

6 0

3 years ago

In about 120 words , write an essay about a birthday celebration you enjoyed.

kozerog [31]

I would like to talk about a birthday celebration that I attended 2/3 months ago. It was one of my friends' birthday who turned 25 that day. My friend's name is Ryan and his parents wanted to celebrate his birthday just before his departure to United Kingdom. Ryan invited almost all of his close friends and 6-7 of us attended the birthday celebration together. Apart from us, there were as many as 100 other people present on the occasion. I did not know most of them but my guess is that they would be mostly Ryan's relatives, neighbors and his father's colleagues.

The party was celebrated at my friend's house at tohana. We went there together and bought a present for the Ryan. After reaching there, Ryan and his parents warmly welcomed us. Later Ryan introduced us to his relatives and to some of his neighbors. We were astonished when we saw the huge birthday cake. 25 candles of different colors were lit around the cake and the whole house was redecorated for the occasion. Anybody could say that some occasion was going on in this house without knowing anything.

We sang the birthday song when Ryan cut the cake. We congratulated him and wished him a prosperous life ahead. Then we ate cake and had a good feast. The foods were delicious and good. We, friends of our circle, went to visit a nearby place and sang different songs. In the evening we went to Ryan's house again and attended a raffle draw. That was a very exciting part of the birthday celebration. Then after few minutes we left the party and went our homes.

7 0

4 years ago

What conclusions can you draw about the relationship between light intensity and the rate of photosynthesis?

Mars2501 [29]

They are both light resources.

mark brainly man.

☺☺☺

3 0

3 years ago

La polidactilia en la especie humana se debe a un alelo dominante. Entre Francisco y Martha, ambos abuelos de Santiago, uno de e

lesya [120]

Answer:

Abuelo/a con polidactilia heterocigoto, Pp
Abuelo/a normal, pp
Juan normal, pp
Esposa de Juan con polidactilia, PP o Pp
Santiago con polidactilia, Pp

Explanation:

Datos disponibles:

Polidactilia es causada por un alelo dominante, P.
El alelo recesivo p produce numero normal de dedos.
Francisco y Martha → Abuelos → uno de ellos con polidactilia
Juan → Hijo → Normal, pp
Santiago → Nieto → Polidactílico

Uno de los padres, ya sea Francisco o Martha, es polidactílico, lo que implica que ésta persona tiene, por lo menos, un allelo dominante en su genotipo, P- (El simbolo "-" esta representando un alelo dominante o uno recesivo).

Si Juan es normal, entonces su genotipo es pp, lo que significa que recibió un alelo recesivo de su padre y otro de su madre. Es decir que el parental policactílico es heterocigota, de forma que pudo heredarle un alelo recesivo a Juan. El otro parental probablemente sea normal, pp, pudiendo solo heredarle a Juan el alelo recesivo.

Entonces, uno de los padres tiene genotipo Pp (heterocigota) y el otro pp (homocigota recesivo).

Juan es norma, pp.

Santiago, hijo de Juan, es polidactílico, lo que implica que lleva en su genotipo por lo menos un alelo dominante, P. Pero Juan solo pudo heredarle un alelo recesivo, p. Por lo tanto, Santiago es heterocigota para la característica, Pp, y heredó el alelo dominante de su madre, que puede ser homcigota dominante PP o heterocigota Pp.

Supongamos que Francisco es polidactílico y Martha normal.

1º Cruza: Francisco x Martha

Parentales) Pp x pp

Gametas) P p p p

F1) 1/2 = 50% Pp

1/2 = 50% pp → Juan

2º Cruza: Juan x Esposa (opción uno: esposa homocigota dominante)

Parentales) pp x PP

Gametas) p p P P

F2) 4/4 = 100% Pp → Santiago

2º Cruza: Juan x Esposa (opción dos: esposa heterocigota)

Parentales) pp x Pp

Gametas) p p P p

F2) 1/2 = 50% Pp → Santiago

1/2 = 50% pp

6 0

3 years ago