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4 years ago

1. (Blank) are the basic units of structure and function in living things.

Chemistry

2 answers:

eimsori [14]4 years ago

8 0

1. Answer;

-Cells

Cells are the basic units of structure and function in living things.

Explanation;

-Cells are the basic building blocks of all living things. They are the smallest and basic units of life. Cells consist of cytoplasm enclosed within a membrane, which contains many bio-molecules such as proteins and nucleic acids and organelles that carry out various activities of a cell.

2. Answer;

-Tissue

A tissue is a group of similar cells that perform a specific function in an organism.

Explanation;

-Tissues are groups of cells that have a similar structure and act together to perform a specific function.

-In human body there are four main types of tissue: muscle, epithelial, connective and nervous. Each is made of specialized cells that are grouped together according to structure and function.

3.Answer;

Motor neurons

Motor neurons are nerve cells that carry response information to muscles and organs.

Explanation;

Motor neurons are a specialized type of brain cell called neurons located within the spinal cord and the brain. Motor neurons carry impulses from the Central nervous system to the effector organs , mainly muscles and glands.

-The cell body of the motor neuron is located in the CNS and their axons projects to the spinal cord or outside of the spinal cord to directly or indirectly control effector organs.

4. Answer;

Energy

Carbon dioxide and energy are outputs of cellular respiration.

Explanation;

-Cellular respiration is the process that takes place in the mitochondria of a cell that breaks down nutrients such as glucose to release energy in form of ATP and carbon dioxide and water as by products.

-The energy released from cellular respiration is used to drive cellular processes such as growth, reproduction and transport among others.

5. Answer;

-Water

Water is essential to living things because many of the chemical reactions that occur in living things require it.

Explanation;

-Water is vital for the survival of living organisms. All plants and animals must have water to survive. If there was no water there would be no life on earth. Water helps dissolves minerals and other nutrients in the body and also carries nutrients and oxygen to cells in the brain and other parts of the body.

6. Answer;

-Microscope

Scientists did not discover the cell until the microscope was invented because cells are too small to see without one.

Explanation;

- Microscopes are devices that are used to observe very tiny substances or organisms that we can not see with our naked eyes.

-Discovery of microscopes played a major role in the discovery of cells. The cell was first discovered by Robert Hooke in 1665 using a microscope.

Trava [24]4 years ago

3 0

Cells are the basic units of structure and function in living things.
A tissue is a group of similar cells that perform a specific function in an organism.
Motor neurons are nerve cells that carry response information to muscles and organs.
Carbon dioxide and energy are outputs of cellular respiration. 
Water is essential to living things because many of the chemical reactions that occur in living things require it.
Scientists did not discover the cell until the microscope was invented because cells are too small to see without one.

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Please answer! I will mark you as brainlist!

blagie [28]

Answer:

a) no

b) no

c) yes

d) yes

Explanation:

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3 years ago

28. How many formula units are found in 0.250 moles of potassium nitrate?

Soloha48 [4]

Answer:

$\boxed {\boxed {\sf B. \ 1.5 *10^{23} \ formula \ units}}$

Explanation:

1 mole of any substance contains the same number of particles. The particles can vary (atoms, molecules, formula units), but there are always 6.022*10²³ particles. In this case, the particles are formula units of potassium nitrate or KNO₃.

Let's create a ratio.

$\frac {6.022*10^{23} \ formula \ units \ KNO_3}{1 \ mol \ KNO_3}$

Since we are trying to find the formula units in 0.250 moles, we multiply by that number.

$0.250 \ mol \ KNO_3 *\frac {6.022*10^{23} \ formula \ units \ KNO_3}{1 \ mol \ KNO_3}$

The units of moles of potassium nitrate cancel.

$0.250 *\frac {6.022*10^{23} \ formula \ units \ KNO_3}{1 }$

The denominator of 1 can be ignored, so we can make a simple multiplication problem.

$0.250 *{6.022*10^{23} \ formula \ units \ KNO_3}$

$1.5055 * 10^{23} \ formula \ units \ KNO_3$

If we round to the nearest tenth, the 0 in the hundredth place tells us to leave the 5 in the tenth place.

$1.5 *10^{23} \ formula \ units \ KNO_3$

0.250 moles of potassium nitrate is approximately equal to 1.5*10²³ formula units of potassium nitrate and choice B is correct.

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3 years ago

Describe examples of failed experiments that produced valuable information

Nataliya [291]

Hello Norgepr, examples of failed experiments that produced valuable information can be the mage via BoingBoing There have been ample stories of human children being raised by other species and eventually becoming more like that animal than an actual human. If the process could go one way, Winthrop Kellogg was sure that it could also go the other, particularly if the animal involved was one of our closest genetic cousins. In 1931, Kellogg received a grant for his experiment and the timing couldn’t be better –his wife just had a baby boy, David. This would give them the unique opportunity to raise a baby chimp, named Gua, right along side a human baby. It didn’t take long for the babes to bond and become best friends. Kellogg and his wife took impeccable notes on their two “children” noting their physical changes, emotions and how they scored on small intelligence tests. The chimp scored notably higher on the intelligence tests due the fact that the species matures faster than human babies. Gua picked up quite a few human behaviors, such as walking upright and eating with a spoon, but she failed to learn how to speak and learn simple repetition games, like patty cake. Her emotions were also much less predictable and inclined to change at the drop of a hat. Unfortunately, the experiment really started to go wrong when little David started to become more chimplike than Gua became humanlike. He only learned a few simple words and often took to making chimp howls when he wanted something. After only nine months, the Kelloggs gave up on Gua, concerned that David would fail to grow up like a normal human child. In the years since this project, plenty of people have adopted chimps as babies, proving beyond a doubt that the animals can never act completely human –even if they are adorable in overalls.

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3 years ago

a metal weighing 50.0g absorbs 20.0j of heat when its temperature increases by 150.0°c . what is the specific heat of the metal

nadezda [96]

Answer:

2.677 J/g°C

Explanation:

Quantity of heat required to raise the temperature of the metal,

Q = mc∆T

where m is the mass of the metal, c is the metal's specific heat capacity, and ∆T is the change in temperature that accompanies the heat transfer process

20.0J = 50.0g × c × 150°C

c = 20.0J/(50.0g × 150°C)

c = 2.677 J/g°C

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3 years ago

A) If an atom has 13 protons how many electrons will it have justify your answer

gogolik [260]

Answer:

Explanation:

because the number of protons and electrons in the atom are the same

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2 years ago