Q: In a trophic pyramid, if grass contains 1000 kcal of energy, approximately how much energy would be available to a hawk at the top of the pyramid after passing through a grasshopper and a bird?

$$1000 \times 0.1 \times 0.1 \times 0.1 = 1$$ kcal

Question 1

Which of the following correctly represents the hierarchy of biological organization from smallest to largest?

Accepted Answer

Atom → Molecule → Macromolecule → Organelle → Cell → Tissue → Organism → Community → Ecosystem → Biosphere

Question 2

In a trophic pyramid, if grass contains 1000 kcal of energy, approximately how much energy would be available to a hawk at the top of the pyramid after passing through a grasshopper and a bird?

Accepted Answer

$$1000 	imes 0.1 	imes 0.1 	imes 0.1 = 1$$ kcal

Question 3

Which of the following statements about biogeochemical cycles is correct?

Accepted Answer

Nutrients such as carbon, nitrogen, and phosphorus cycle, but energy does not.

Question 4

A scientist is testing the effect of sunlight on plant growth. Which is the independent variable?

Accepted Answer

The amount of sunlight the plants receive

Question 5

Which of the following best describes a buffer in a biological system?

Accepted Answer

A substance that absorbs or releases H$$^+$$ ions to stabilize pH

Question 6

Which of the following is a correct example of a polar covalent bond?

Accepted Answer

H$$_2O$$

Question 7

A molecule is considered organic if it contains which of the following?

Accepted Answer

Carbon-hydrogen bonds

Question 8

Which functional group is found in both fatty acids and amino acids and is responsible for acidic properties?

Accepted Answer

Carboxyl group (COOH)

Question 9

Which of the following best explains why NaCl dissolves in water?

Accepted Answer

Ionic bonds in NaCl are broken by water molecules

Question 10

Which macromolecule is primarily responsible for storing genetic information?

Accepted Answer

Nucleic acids

Question 11

A protein loses its shape and function after being exposed to high heat. This process is called:

Accepted Answer

Denaturation

Question 12

Which of the following best describes the secondary structure of a protein?

Accepted Answer

Folding into alpha helices or beta sheets

Question 13

Which of the following is a correct example of a disaccharide?

Accepted Answer

Sucrose

Question 14

Which statement about saturated and unsaturated fats is correct?

Accepted Answer

Saturated fats have no double bonds and are solid at room temperature.

Question 15

Which of the following is a function of proteins in living organisms?

Accepted Answer

Enzyme catalysis

Question 16

A scientist discovers a unicellular organism living in a hot spring with no nucleus. To which domain does it most likely belong?

Accepted Answer

Archaea

Question 17

Which of the following best describes the role of R-groups in amino acids?

Accepted Answer

They determine the properties and function of the amino acid.

Question 18

Which of the following best explains why lipids are hydrophobic?

Accepted Answer

They have long hydrocarbon chains that repel water.

Question 19

Which of the following is an example of a hypothesis?

Accepted Answer

Plants grow faster when exposed to more sunlight.

Question 20

Which of the following best describes the difference between a community and an ecosystem?

Accepted Answer

A community includes only living organisms, while an ecosystem includes both living and non-living components.

Unit 2 Study Guide

Study Guide - Practice Questions

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