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Vesna [10]
3 years ago
12

Pre-Test

Biology
1 answer:
astra-53 [7]3 years ago
4 0

Answer:

a.) units

Explanation:

just took the test and got it right

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Hypothesis: If i add the egg to vinegar then the shell will dissolve within 24 hours
nadezda [96]

Answer :

Vinegar is a weak acid. This is used to make a naked egg. When an egg is added in the vinegar for one day / 24 hrs, it reacts with the eggshell.  The calcium carbonate shell gets dissolve.

Then an egg without shell is formed and the size of the egg does not change. The calcium carbonate reacts with acetic acid and forms carbon dioxide.

When the shell-less egg is kept in the vinegar for 48 hrs i.e. 2 days again, the water content in it enters into the eggs through the membrane. Then the egg gets somewhat bigger.

Otherwise, for 24 hrs, vinegar is acting like an isotonic solution and only dissolves the shell. This experiment would be done for showing the osmosis process through the cell membrane.

6 0
3 years ago
City officials are proposing a recycling program. They must examine the benefits to their community, not just the environment, t
Ronch [10]
From: https://answers.yahoo.com/question/index?qid=20111123203903AA4eLha 

1. Less trash to landfill. More recycled items = savings to production costs of new items 
<span>such as aluminum, glass, cardboard. </span>

<span>2. Most insects have particular predators such as a specific animal or bird that eats them as a major or sole portion of their diet. </span>

<span>3. Do not plant 100% of the same plants and trees across the area. </span>
<span>Do not harvest all of a species during a normal growth cycle. If a tree takes 50 years to grow to harvest size, schedule cuttings to avoid extinction of that tree within the area.</span>
7 0
3 years ago
Which of the following is not a major class of nutrients required by the human body?Select one:a. fiberb. carbohydratesc. protei
arlik [135]

Answer:

a. Fiber

Explanation:

The major nutrients required by humans in food are carbohydrates, proteins, fats, vitamins, and minerals. Our food also has dietary fibers and water. Dietary fibers or fibers are also known as roughage. Fibers are present mainly in plant products such as whole grains, pulses, fruits and vegetables. Fibers only add bulk and do not provide any nutrients to us. However, dietary fibers help the body get rid of undigested food.

8 0
3 years ago
Which structural characteristic is found in both plant and animal cells?
defon


The best answer is A.

Mitochondria are small organelles found floating  free in the cytoplasm of both animal and plant cells. They consist of two membranes, an outer and inner membrane which has numerous folds creating layered structures called cristae.Inside the mitochondria, there is found  fluid called the matrix

 Mitochondria are the powerhouse of cells. Many of the reactions in cellular respiration that take place in the cell occur in mitochondria and thus these organelles are key in the production of energy .


6 0
3 years ago
How does ATP enable transport proteins to move ions across a cell membrane?​
Alekssandra [29.7K]

The ATP enables the movement of transport proteins to move the ions across a cell membrane by its getting fueled by its hydrolysis

<u>Explanation:</u>

The plasma membrane is a semi permeable membrane that is the movement of molecules across the membrane is constricted. There are 2 types of moment across the plasma membrane one is the active transport and the other is the passive transport. The active transport involves the help of ATP whereas the passive transport does not involve ATP to transport the materials.

7 0
3 years ago
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