IB Bio Topic 3

What does a nucleotide consist of?

• Phosphate + pentose sugar + Nitrogenous base

• Phosphorus + pentose sugar + Nitrogenous base

• Phosphate + hexose sugar + Nitrogenous base

• Phosphorus + hexose sugar + Nitrogenous base

Scientists have found geysers on one of Saturn’s moons. The geysers release water vapor containing complex organic compounds, which may indicate the presence of life. Which of the following elements is most likely abundant in the organic compounds in the water vapor?

• carbon

• chlorine

• iron

• zinc

Tags

NGSS.HS-LS1-6

Which of the following is the main reason that humans need to include carbohydrates in their diet?

• Carbohydrates are broken down in cells for energy.

• Carbohydrates combine to form many different proteins.

• Carbohydrates act as catalyst to speed up chemical reactions.

• Carbohydrates are the building blocks for cell growth and repair.

Tags

NGSS.HS-LS1-7

Monosaccharides are monomers of

• Carbohydrates

• Lipids

• Proteins

• Nucleic Acids

These biomolecules are, in order of appearance...

• cis and trans saturated fatty acids

• cis and trans unsaturated fatty acids

• trans and cis saturated fatty acids

• trans and cis unsaturated fatty acids

Tags

NGSS.HS-PS1-2

A polymer of alpha-D-glucose found in plants has mostly 1,4 linkages and some 1,6 linkages. Which molecule fits this description?

• glycogen

• cellulose

• amylose

• amylopectin

The diagram shows the structure of palmitic acid. What type of fatty acid is palmitic acid?

• it is monosaturated

• it is polyunsaturated

• it is saturated

• it is a trans-fatty acid

What is a role of cholesterol in animal cells?

• it increases body fat

• it controls membrane fluidity

• it lines the inner wall of capillaries

• it is a constituent of bile

What molecule is a polysaccharide?

• glucagon

• glycose

• glycerol

• glycogen

Which substance is used for structure in plants?

• amylopectin

• cellulose

• collagen

• starch