Question 1 All living organisms contain carbon atoms. Which of the following is an important characteristic of carbon?

Question 1 options:

Carbon atoms are highly reactive and form unstable bonds with any available atom.


Carbon atoms can bond with any other atom, but they cannot form bonds with other carbon atoms


Carbon atoms are very stable and do not easily form bonds with other atoms


Carbon atoms can bond with many other kinds of atoms to form very stable molecules.



Question 2
Any chemical that contains carbon bonded to at least one other atom, usually hydrogen, is known as a

Question 2 options:

Carbohydrate


Fatty Acid


Organic Molecule




Question 3
How many valence electrons are generally needed to fill the outer shell of most atoms?

Question 3 options:

4


6


8



Question 4
The macromolecules in biochemistry are proteins, carbohydrates, lipids and nucleic acids. What main elements do all of have in common?

Question 4 options:

Carbon and Sulfur


Carbon and Hydrogen


Oxygen and Nitrogen


Oxygen and Phosphorus

Answers

Answer 1
Answer: 1. The correct answer is 4. Carbon can bond to 4 other atoms, exponentially increasing its ability to make different molecules.

2. The correct answer is 3. An organic compound (or molecule) is any atom (usually hydrogen) that bonds with carbon.

3.  The correct answer is the third option (8 electrons). Valence electrons in the outer shell are those can form a chemical bond. When (most) atoms have 8 electrons in their outer shell, they are then considered to have maximum stability.

4. The correct answer is 2. These macromolecules all contain carbon and hydrogen, making them organic compounds. 
Answer 2
Answer: 1 - Carbon atoms can bond with many other kinds of atoms to form very stable molecules. 2 - organic molecules . 3 -  8 (full shell) . 4 - i'd say Carbon and Hydrogen

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Match the following organs and organ systems. 1.digestive system brain 2.central nervous system tracheal system 3.respiratory system intestines 4.excretory system bladder

Answers

The correct macthing of the organs with their organ systems is as follows.

1. Digestive system - intestines.

2. Central nervous system - brain.

3. Respiratory system - tracheal system.

4. Excretory system - bladder.

Digestive system is made up of the alimentary canal consisting of the digestive organs and the glands. Among the digestive organs, the intestines play a major role in the process of digestion. The small intestine is the site of complete digestion which is associated with the pancreas and liver. The large intestine is involved the absorption of water from the digested food and remaining waste material is stored and thrown out of the body during defecation.

The central nervous system is made up of the brain and the spinal cord. The brain makes the largest part and the functional of the central nervous system. It controls most of the activities of the body. It is made up of three parts called the cerebrum, cerebellum and medualla oblongata and is protected by the skull.

The respiratory system is divided into the upper respiratory tract consisting of the nasal cavity, pharynx and larynx, and the lower respiratory tract consisting of the trachea, bronchi, bronchioles and the alveoli. The trachea or the wind pipe is a cylindrical tube infront of the oesophagus, supported by 16-20 C-shaped hyaline cartilage. It serves as a passage for air to move in and out of the lungs.

The excretory system is made up of a pair of kidneys, a pair of ureters, an urinary bladder and an urethra. The urine produced by the kidney flows through the ureters and is collected in the urinary bladder. A spinchter (a ring of muscle) guards the opening of the bladder into the urethra and relaxes only at the time of urination under the impulse from the brain.

In food chains, the flow of energy is ALWAYS _________.

Answers

The question is asking us to continue the sentence: In food chains, the flow of energy is ALWAYS. One possible way to complete the sentence is to say "one-way", that is, the energy comes from the energy source (such as the sun) towards the consumers (to plants and then to animals) but not the other way (except when the animals die and their bodies are eaten by worms, but the flow is still in one direction, which forms a circle.

In food chains, the flow of energy is ALWAYS one-way

What do the similarities among the forelimb bone arrangment of these diverse animals imply about their ancestry?

Answers

Animals share a common ancestor and at least one gene from their parents. Hope it helped you.

As DNA is replicated, which DNA base pair will bond to cytosine

Answers

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Tiny, fingerlike structures called villi and microvilli increase the small intestine’s ____________________, allowing it to absorb more nutrient molecules.

Answers

Tiny, fingerlike structures called villi and microvilli increase the small intestine’s surface area, allowing it to absorb more nutrient molecules. It allows the surface area of small intestine to absorb more nutrients for he body

Answer: surface area

Explanation: