Carbon has four electrons in its outer shell. Why does this make it important to life?(1 point) Responses The outermost shell can form up to four covalent bonds and this allows it to form biomolecules. The outermost shell can form up to four covalent bonds and this allows it to form biomolecules. The outermost shell never fills making it unstable and unable to bond to other carbon molecules. The outermost shell never fills making it unstable and unable to bond to other carbon molecules. The outermost shell can only bond with hydrogen and other carbon atoms. The outermost shell can only bond with hydrogen and other carbon atoms. The outermost shell is full, making it a stable element that can bond to water.

The correct response is: **The outermost shell can form up to four covalent bonds and this allows it to form biomolecules.**

This characteristic of carbon is crucial for life because it enables the formation of a vast array of complex molecules, including proteins, nucleic acids, carbohydrates, and lipids, which are essential for the structure and function of living organisms.

What is the definition of a hydrocarbon?(1 point) Responses electrons shared between two different atoms electrons shared between two different atoms polysaccarides that are used as a source of energy. polysaccarides that are used as a source of energy. a large chain of carbons and hydrogens bonded together a large chain of carbons and hydrogens bonded together a carbon, oxygen, and hydrogen bonded together.

The correct response is: **a large chain of carbons and hydrogens bonded together.**

Hydrocarbons are organic compounds consisting entirely of hydrogen and carbon atoms, and they can form chains or rings.

What do amino acids, fatty acids, and sugars (monosaccharides) have in common?(1 point) Responses They are made of carbon, oxygen, and nitrogen. They are made of carbon, oxygen, and nitrogen. They are made up of carbon, phosphate, and hydrogen They are made up of carbon, phosphate, and hydrogen They are made of carbon, oxygen, and hydrogen. They are made of carbon, oxygen, and hydrogen. They are made up of phosphate, nitrogen, and hydrogen

The correct response is: **They are made of carbon, oxygen, and hydrogen.**

Amino acids, fatty acids, and sugars (monosaccharides) all contain carbon, oxygen, and hydrogen as part of their molecular structures, although amino acids also contain nitrogen.

Amino acids have a general structure that is the same across all of them. They also have a structure that makes them unique. What makes amino acids unique from one another?(1 point) Responses The R group that hangs off the side of the carboxyl group. The R group that hangs off the side of the carboxyl group. The amino group that is made up of nitrogen and two hydrogen atoms. The amino group that is made up of nitrogen and two hydrogen atoms. The long strands of glucose molecules that fold the proteins. The long strands of glucose molecules that fold the proteins. The carboxyl group that consists of a carbon bonded to an OHOH group

The correct response is: **The R group that hangs off the side of the carboxyl group.**

The R group (or side chain) of an amino acid is what makes each amino acid unique, as it varies among different amino acids and determines their properties and functions.

Which compound is a carbohydrate made up of long glucose chains, and commonly found in plants?(1 point) Responses nucleotide nucleotide protein protein amino acid amino acid starch

The correct response is: **starch.**

Starch is a carbohydrate made up of long chains of glucose molecules and is commonly found in plants as a form of energy storage.

Glucose is a hydrocarbon that can be used to produce other biomolecules. Nitrogen can bond with glucose to make a biomolecule that can perform cellular functions. Which compound contains nitrogen?(1 point) Responses starch starch water water fructose fructose amino acid

The correct response is: **amino acid.**

Amino acids are organic molecules that contain nitrogen, and they can bond with glucose and other compounds to form various biomolecules that perform cellular functions.