Question 1

Which of the following best describes an emergent property in biological systems?

Accepted Answer

A property that arises from the interaction of individual components, not present in the components alone.

Question 2

A scientist wants to test the effect of a new fertilizer on plant growth. She sets up two groups: one receives the fertilizer, and the other does not. What is the independent variable in this experiment?

Accepted Answer

The amount of fertilizer applied to the plants.

Question 3

Which of the following best explains why water is considered a polar molecule?

Accepted Answer

Water has an uneven distribution of electrons, resulting in partial positive and negative charges.

Question 4

Which equation correctly represents the calculation of standard deviation for a set of $n$ data points $x_1, x_2, ..., x_n$ with mean $\mu$?

Accepted Answer

$\sqrt{\frac{1}{n} \sum_{i=1}^{n} (x_i - \mu)^2}$

Question 5

Which of the following statements about isotopes is correct?

Accepted Answer

Isotopes of an element have the same number of protons but different numbers of neutrons.

Question 6

Which of the following best describes the difference between covalent and ionic bonds?

Accepted Answer

Covalent bonds involve the sharing of electrons, while ionic bonds involve the transfer of electrons.

Question 7

Which of the following is a buffer system in human blood that helps maintain pH?

Accepted Answer

The bicarbonate buffer system: $\mathrm{CO_2 + H_2O \leftrightarrow H_2CO_3 \leftrightarrow HCO_3^- + H^+}$

Question 8

Which property of water is most responsible for its ability to moderate Earth's climate?

Accepted Answer

High specific heat capacity

Question 9

A solution has a pH of 4. What is the concentration of hydrogen ions $[H^+]$ in the solution?

Accepted Answer

$1 	imes 10^{-4}$ M

Question 10

Which of the following is NOT one of the four major threats to biodiversity?

Accepted Answer

Increased genetic diversity

Question 11

Which of the following best explains biological magnification?

Accepted Answer

Toxins become more concentrated in organisms at higher trophic levels.

Question 12

Which of the following molecules is most directly involved in the storage and transfer of energy in cells?

Accepted Answer

ATP ($\mathrm{C_{10}H_{16}N_5O_{13}P_3}$)

Question 13

Which of the following best describes the versatility of carbon in forming biological molecules?

Accepted Answer

Carbon can form four covalent bonds, allowing for diverse structures such as chains, rings, and branches.

Question 14

Which process is responsible for breaking down polymers into monomers by adding water?

Accepted Answer

Hydrolysis

Question 15

Which of the following correctly matches a macromolecule with its monomer?

Accepted Answer

Protein – Amino acid

Question 16

Which level of protein structure is primarily determined by hydrogen bonding between backbone atoms, resulting in alpha helices and beta sheets?

Accepted Answer

Secondary structure

Question 17

Which of the following is a real-world example of the impact of habitat fragmentation on biodiversity?

Accepted Answer

The decline of the greater prairie chicken population in Illinois due to isolated habitats.

Question 18

Which of the following best describes the function of movement corridors in conservation biology?

Accepted Answer

They connect isolated habitats, allowing species to migrate and maintain genetic diversity.

Question 19

Which equation best represents the carrying capacity ($K$) in the logistic growth model for population size ($N$) over time?

Accepted Answer

$\frac{dN}{dt} = rN \left(1 - \frac{N}{K}\right)$

General Biology Study Guide: Key Topics and Concepts

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