Q: Which equation correctly calculates the number of neutrons in an atom?

$$\text{Number of Neutrons} = \text{Atomic Mass} - \text{Atomic Number}$$

Question 1

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

Accepted Answer

A property that arises only when individual components interact at a higher level of organization.

Question 2

Which equation correctly calculates the number of neutrons in an atom?

Accepted Answer

$$	ext{Number of Neutrons} = 	ext{Atomic Mass} - 	ext{Atomic Number}$$

Question 3

A PET scan uses radioactive isotopes to detect cancer cells. Which property of radioactive isotopes makes this possible?

Accepted Answer

They emit gamma rays when they decay.

Question 4

Which of the following is NOT one of the 'Big Four' elements that make up approximately 96% of living matter?

Accepted Answer

Phosphorus

Question 5

Which statement best explains why trace elements are important in the human body?

Accepted Answer

They serve as essential cofactors for enzymes and proteins, especially in the brain.

Question 6

Which of the following best describes the difference between a compound and an element?

Accepted Answer

A compound can be broken down into its constituent elements by chemical reactions, while an element cannot.

Question 7

Which of the following is a correct example of an emergent property resulting from the combination of elements?

Accepted Answer

Sodium (Na) and chlorine (Cl) combine to form sodium chloride (NaCl), which is edible table salt.

Question 8

Which of the following statements about prokaryotic and eukaryotic cells is correct?

Accepted Answer

Eukaryotic cells have a DNA-containing nucleus, while prokaryotic cells lack a nucleus.

Question 9

Which domain of life includes organisms with membrane-enclosed organelles and a nucleus?

Accepted Answer

Eukarya

Question 10

A scientist discovers a new organism that is unicellular, lacks a nucleus, and thrives in extreme environments. To which domain does this organism most likely belong?

Accepted Answer

Archaea

Question 11

Which of the following best illustrates the concept of reductionism in biology?

Accepted Answer

Studying the function of a single protein to understand how a cell works.

Question 12

Which of the following is the correct order of biological organization from smallest to largest?

Accepted Answer

Atom $$\rightarrow$$ Molecule $$\rightarrow$$ Cell $$\rightarrow$$ Organ $$\rightarrow$$ Organism

Question 13

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 14

Which of the following is a real-world application of radioactive isotopes in biology?

Accepted Answer

Dating fossils using carbon-14.

Question 15

Which of the following best explains why structure and function are correlated in biology?

Accepted Answer

The shape and arrangement of biological molecules determine their roles and effectiveness in living systems.

Question 16

Which of the following is a trace element that is essential for brain function and whose deficiency can lead to neurodegenerative diseases?

Accepted Answer

Iron

Question 17

Which of the following kingdoms is NOT part of the domain Eukarya?

Accepted Answer

Bacteria

Question 18

A molecule of water ($$H_2O) is $$formed by combining hydrogen and oxygen. Which property does water have that neither hydrogen nor oxygen possess alone?

Accepted Answer

It is a liquid at room temperature.

Question 19

Which of the following statements about the cell is correct?

Accepted Answer

The cell is the smallest unit of life that can perform all activities required for life.

Principles of Molecular and Cellular Biology for Brain Sciences: Foundational Concepts

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