Basic Biochemistry (7th)

Plants store carbohydrates that they produce in the form of:

• proteins

• fats

• starches

• cytoplasm

Answer explanation

Carbohydrates are sugars and starches. Plants store carbohydrates in the form of starch.

Tags

NGSS.MS-LS1-6

Which chemical formula represents a carbohydrate?

• CH₄

• C₃H₇O₂N

• C₆H₁₂O₆

• CO₂

Answer explanation

Carbohydrates contain carbon and hydrogen to oxygen in the ratio of 1:2:1.

Tags

NGSS.MS-PS1-1

The major role of carbohydrates in the human diet is to

• form the membranes that surround mitochondria

• act as a catalyst for cellular reactions

• supply energy for the body

• provide building blocks for amino acids

Answer explanation

Carbohydrates are sugars and starches.

Tags

NGSS.MS-LS1-7

NGSS.MS-LS2-3

Base your answer to the question on the diagram and on your knowledge of biology. The diagram represents a portion of a starch molecule. The building blocks for this starch molecule are

• amino acids

• simple sugars

• fats

• molecular bases

Answer explanation

The building blocks are monosaccharides.

Tags

NGSS.MS-PS1-1

Eating a sweet potato gives energy for human life processes. What is the source of energy in this sweet potato?

• protein molecules stored within the potato

• water molecules absorbed by the potato plant

• starch molecules made by photosynthesis

• vitamins and minerals found in the soil

Answer explanation

The Sun is the source of all the energy on the Earth. Green plants can trap the energy from the Sun during a certain process.

Tags

NGSS.MS-LS1-6

Which compound has the structural formula shown in the diagram?

• starch

• PGAL

• ATP

• glucose

Answer explanation

This is a monosaccharide.

Tags

NGSS.MS-PS1-1

There are over 2000 kinds of edible insects in the world, and they are becoming an increasingly popular source of protein. One cup of cricket flour contains over 28 grams of protein. The building blocks of the protein in cricket flour are

• amino acids

• water

• simple sugars

• carbohydrates

Answer explanation

Crickets are a source of protein and all proteins are constructed of chains of this type nutrient.

Proteins, starch, and DNA are similar in that they are all

• organic compounds

• parts of genes

• made of amino acids

• made of simple sugars

Answer explanation

They all contain carbon.

The shape of a protein molecule directly determines its

• movements through the cytoplasm

• functions inside and outside of cells

• roles in building water molecules

• circulation throughout the body

Answer explanation

The shape of a protein molecule directly determines its functions. Proteins such as enzymes have active sites that specific molecules fit into.

Tags

NGSS.MS-LS3-1

Three days after an organism eats some meat, many of the organic molecules originally contained in the meat would be found in newly formed molecules of

• glucose

• protein

• starch

• oxygen

Answer explanation

Meat is made of amino acids.

Tags

NGSS.MS-LS1-7