Molecular Biology

Corn is a popular feed for pigs because it is high in carbohydrates. However, it has a very low level of the amino acid lysine, so farmers usually add high-lysine feeds to the corn. Which statement BEST explains why lysine levels in pig feed are important?

• Cells stop making protein when their supply of lysine runs out.

• Cells stop replicating DNA when their supply of lysine runs out.

• Cells stop processing carbohydrates when their supply of lysine runs out.

• Cells stop repairing cell membranes when their supply of lysine runs out.

Tags

NGSS.MS-LS3-1

Which statement about cells and sugar is true?

• Both animal cells and plant cells use sugar.

• Animal cells use sugar, but plant cells do not.

• Animal cells do not use sugar, but plant cells do.

• Neither animal cells nor plant cells use sugar.

Tags

NGSS.MS-LS1-7

NGSS.MS-LS1-6

NGSS.MS-LS2-3

How are plant cells and human cells the same?

• They can produce their own oxygen.

• They make their own food from sunlight.

• They can receive nutrients through the cell wall.

• They use mitochondria to release energy from sugars.

How are plant cells and human cells different?

• Human cells need food, but plant cells do not.

• Human cells need energy, but plant cells do not.

• Plant cells make their own food, but human cells do not.

• Plant cells make their own energy, but human cells do not.

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NGSS.MS-LS1-6

Which food items can be broken down mostly into amino acids?

• spaghetti noodles

• hamburger patties

• apple slices

• cucumber slices

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NGSS.MS-LS1-7

One way humans store energy is by making the molecule glycogen. Clusters of which atoms are rearranged when the body digests plant sugars to make glycogen?

• hydrogen, nitrogen, carbon

• oxygen, sulfur, carbon

• carbon, hydrogen, oxygen

• nitrogen, carbon, sulfur

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NGSS.MS-LS1-7

One thing that all human cells have in common is that they

• control the brain.

• make food.

• move blood

• take in energy.

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NGSS.MS-LS1-2

After a person eats, the food is converted into energy by

• muscles.

• tissues.

• bones.

• cells.

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NGSS.MS-LS1-7

Animal cells obtain energy by

• processing sunlight.

• absorbing nutrients.

• growing.

• dividing.

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NGSS.MS-LS1-7

NGSS.MS-LS2-3

Why is protein an important part of a healthy diet?

• It is needed to change glucose to energy.

• It is needed to store nutrients.

• It is needed to repair tissue.

• It is needed to produce water.