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elena55 [62]
3 years ago
14

HELP QUICK . ....................

Biology
1 answer:
Alexus [3.1K]3 years ago
5 0
What the question please
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Name the two stages of photosynthesis and list the starting molecules and ending molecules of each.
ratelena [41]

Answer:

Stage 1-

Name: Light-dependent reaction.

Starting molecules- 6H2O and Sunlight.

Ending molecules- ATP and NADPH (Nicotinamide adenine dinucleotide phosphate)

Stage 2-

Name: Calvin cycle.

Starting molecules- 6CO2 and ADP (Adenosine di-phosphate)

Ending molecules- C6H12O6 and 6O2

3 0
2 years ago
Which structure is the interface between the blood systems of a mother and her fetus
ICE Princess25 [194]
That's the placenta.
3 0
3 years ago
Read 2 more answers
If Jack and Jill have a child with an AAa genotype, during which meiotic division, and in which parent, could nondisjunction hav
ankoles [38]

Further information from another source:

Jill is heterozygous for gene A and is going to have a child with Jack, who is homozygous recessive for gene A.

Answer:

Maternal meiosis II

Explanation:

Jill has the genotype Aa, and Jack has the genotype aa. Jack can only contribute the a, whereas Jill can contribute A or a. For the child to have 2 copies of the A allele and two copies of the a allele, that means the nondisjunction must have happened in the mother.

As for the stage of meiosis, non-disjunction in meiosis I means that homologous chromosomes fail to separate properly. This would mean that the child would inherit Aa from its mother and a from its father. This is not the case.

Non-disjunction in meiosis II means identical sister chromatids fail to separate properly, which means the child would inherit either aa from its mother, or AA from its mother, and a from its father. This could give the genotype AAa. Therefore, nondisjunction must have occurred in maternal meiosis II

5 0
3 years ago
The general function of the cardiovascular system is to transport blood throughout the body to allow the exchange of substances
taurus [48]

Explanation:

The cardiovascular system is vital for life. During the day and during the night, minute by minute, our cells need nutrients and oxygen.

Thanks to a complex and complete system of “pipes”, the heart, as if it were a double pump, is able to propel, through the arteries, the oxygenated blood and the nutrients necessary to give life to all the cells of the body, and in less than a minute.

The blood vessel network, in the form of eight, performs the following functions:

the rapid transport of blood with oxygen and nutrients to human body tissues and organs, as well as the collection of metabolic wastes. It also carries vital substances for body homeostasis.

Hormonal control: it takes hormones to the target organs and secretes its own hormones.

Temperature regulation: controls the distribution of heat between the center of the body and the skin.

Reproduction: helps an erection to occur.

the defense against pathogens: it carries immune cells and antibodies.

the expulsion of substances and salts through the filtrate of the kidney maintaining the pH of the blood and the balance of sodium (salt) and potassium, essential for life.

8 0
2 years ago
By about ____ months of age, different circuits in the brain begin to control infants’ looking at faces, allowing infants to dis
mojhsa [17]

Answer: 2-3

Explanation:

A biological neural network or neural circuit is a set of ordered synaptic connections that occur as a result of the binding of neurons to others in their corresponding regions following neural migration. At birth, a baby has an average of 100 billion neurons, but few neural connections. These will multiply as the child grows, through environmental, sensory, cognitive and movement stimulation. <u>Stimulating mobility and physical activity also has a positive effect on cognitive functioning by modifying the activity of certain brain areas</u>. Physical exercise has beneficial effects on brain function, such as promoting neuroplasticity and increasing learning and memory performance, which may be due to increased expression of various neural growth factors.

<u>Finally, environmental stimulation is basic for harmonious brain development and for laying the neurophysiological foundations of our children's future brains. </u>Thus, there are many mechanisms that nature has at its disposal to prevent babies from being left helpless.  All of them favour their relationship with adults and thus their neurons, at a time of maximum growth of their extensions, can form the brain circuits that allow the acquisitions that make them advance in their neurodevelopment. If babies do not receive from their adults sufficient affection and attention, brain growth will be much less and their neurodevelopment will inevitably be delayed, because what makes the brain grow and change is precisely the creation of new circuits as it learns new things, and those who can learn most are the most experienced. By aboyt 2-3 months is when circuits of the brain begin to be created.

7 0
3 years ago
Read 2 more answers
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