BIOLOGY HIGH SCHOOL

Explain the purpose of a quick body response like pulling a hand away from a hot stove

Answers

Answer 1
Answer: The purpose of a quick body response is from your brain. Your brain has a nervous system that can tell you to do things that you should.
In this case, Pulling your hand away from a hot stove could be dangerous, so you nervous system quickly reacts to take your hand away from the stove.

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What are meristematic tissues?

Answers

Meristematic tissue is the dividing tissue present at the growing regions of the plants. They are meant for growth of an organ Cells of meristems divide continuously and help in increasing the length and girth of the plant
The cells of this tissue are similar in structure and have thin cellulose cell walls
The cells do not contain any intercellular space between them 
The cells contain few vacuoles or no vacuoles at all
They are further divided in the following parts
1)Apical meristem
2)Lateral meristem
3)Intercalary meristem
Meristematic tissues are the temporary tissues. They help in the growth of plants and after contributing to the growth of plants, they get transformed to permanant tissues.

Juan’s family has a history of sickle cell disease. His father died of sickle cell disease complications when Juan was six years old. He remembers his father being in great pain. Juan marries Gina. Gina’s maternal grandmother and paternal grandfather had sickle cell disease, but neither of her parents has the disease. Juan does not want to have children because he is convinced they will have sickle cell disease. Gina is not so sure. They have come to you for advice about having whether or not to have children. Based on your calculations of the probability of their child getting sickle cell disease, what is your advice? Show your calculations and explain your reasoning for your response. It may be helpful for you to draw pedigrees and possible Punnett squares for both Juan and Gina’s families

Answers

Sickle cell disease is a hereditary disease. This means that someone can get sickle cell disease if they receive the sickle genes from BOTH parents. If someone receives a sickle gene from only one parent, then this person does not have sickle cell disease, but instead has the sickle cell trait. This means that they can still pass the trait on to their offspring. Because Juan's father had sickle cell disease and Juan does not, he carries the sickle trait. Since Gina's maternal grandmother had sickle cell disease, Gina's mother had a 50 percent chance of carrying the trait. Since Gina's father doesn't have the trait, Gina thus has a 25 percent chance of carrying the trait. If Gina has a 25 percent chance of carrying the trait and Juan has a 100 percent chance, then together they have a 125/200 chance of both passing the trait on to their children. 125/200 = .625, so they would have a 62.5 percent chance of passing on this trait to their children. Although this percentage does not mean their children would definitely have sickle cell disease, I would advise Juan and Gina to weigh their options, since 62.5 is more than 50 percent.

Which statement is true?Sediment can be any size.
Sediment is only small particles of sand that settle out of the water.
Sediment doesn't move from the place where it was formed.
Sediment in the wind is too small to cause damage.

Answers

Sediment is only small particles of sand that settle out of the water.

Most animal cell membranes have proteins that pump ______ ions out of the cell and potassium ions into the cell.

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Most animal cell membranes have proteins that pump Sodium  ions out of the cell and potassium ions into the cell .


I hope that's help !

In gel electrophoresis why does the DNA move toward the bottom of the wall of gel? A. DNA is negatively charged. B. DNA is positively charged. C. DNA is extremely heavy. D. DNA is less dense than air.

Answers

Answer:

The correct answer is option  A. "DNA is negatively charged".

Explanation:

The molecules of Deoxyribonucleic acid (DNA) have a negative charge because of the negative charge of phosphate component located in its ribose-phosphate backbone. This property of DNA is used during gel electrophoresis to separate the molecules according to its size. One molecule of DNA has a one negative charge, and moves towards the bottom of the wall of the gel because is where the anode is located. The larger the size of the DNA the faster it will move to the anode.
A. The DNA is negatively charged.

Which of the following organisms exhibits radial symmetry?Flatworm

Butterfly

Tadpole

Starfish

Answers

Answer: The correct answer is- Starfish.

Radial symmetry depicts a body plan of an organism, which can be divided into two equal halves when a plane from any angle passes through central axis of the body.

Starfish is radially symmetrical organism as any plane can divide its body into two equal halves.

On the contrary, flatworm, butterfly, and tadpole show bilateral symmetry ( only single axis/ plane can divide the body into two equal halves.

Among the listed organisms, only the starfish exhibits radial symmetry, which refers to an organism's body being shaped like a pie or barrel, allowing it to be divided into more than five symmetrical parts around a central axis.

Out of the provided organisms - Flatworm, Butterfly, Tadpole, and Starfish - the type that shows radial symmetry is the Starfish.

Radial symmetry refers to when an organism has a body shaped like a pie or barrel. This means it can be divided into five or more identical and symmetrical parts.

Body parts are positioned around a central axis, much like slices of a pie.

Think of a starfish with its arms extending out from the center - each arm is effectively a mirror image of the others, thus demonstrating radial symmetry.

Learn more about Radial Symmetry here:

brainly.com/question/32913358

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