Anatomy & Physiology Exam Prep Exam Questions & Answers 2026 (11–20)

Question 1

Blood serum calcium levels are critical in human physiology. Calculate the average atomic weight of calcium, considering it is made up of the following isotopes. Isotope Abundance (%) Atomic Mass (amu) $$^{40}Ca$$ 97 40.078 $$^{44}Ca$$ 2 43.955 $$^{48}Ca$$ 1 47.953

TheoryPractice · Accepted Answer

40.234 amu. The average atomic weight is calculated as follows: (97% of 40.078 amu) + (2% of 43.955 amu) + (1% of 47.953 amu). Average atomic weight = $$0.97 	imes 40.078 + 0.02 	imes 43.955 + 0.01 	imes 47.953$$ Average atomic weight = 38.87566 + 0.8791 + 0.47953 = 40.23429 Rounded to three decimal places, the answer is 40.234 amu.

Question 2

How many neutrons does the most common isotope of carbon have?

TheoryPractice · Accepted Answer

6. The most common isotope of carbon is Carbon-12, which has an atomic number of 6. The number of neutrons is calculated as the mass number minus the atomic number. For Carbon-12, the number of neutrons is 12 - 6 = 6.

Question 3

Consider a group of minerals, each containing iron atoms. Despite exhibiting various chemical properties, what fundamental atomic characteristic do their iron atoms share?

TheoryPractice · Accepted Answer

They have the same number of protons.. The key atomic characteristic that all iron atoms would share across the minerals is the same number of protons. This number defines the element as iron, which is element number 26 on the periodic table. Any differences in the number of neutrons would result in isotopes, but the proton number remains unchanged.

Question 4

Two chemical compounds, A and B, are composed of atoms that are isotopes of each other. Which of the following is true about the chemical properties of compounds A and B?

TheoryPractice · Accepted Answer

They exhibit similar chemical properties.. Since compounds A and B are composed of isotopes, they contain atoms with the same number of electrons and protons but different numbers of neutrons. The chemical properties of a compound are primarily determined by electron interactions and configurations, not by neutrons, which means that compounds A and B should have similar chemical properties.

Question 5

Consider the following statements about ionization energy and bonding tendencies of elements.
I. Alkali metals have high ionization energy and tend to form covalent bonds.
II. Halogens have high ionization energy and often form covalent bonds.
III. Alkali metals have low ionization energy, making them likely to form ionic bonds. Element Groups Ionization Energy Characteristic Bonding Tendency Alkali Metals Low Likely to form ionic bonds Halogens High Often form covalent bonds

TheoryPractice · Accepted Answer

II and III. Alkali metals have low ionization energy, making them lose electrons easily and typically form ionic bonds. Halogens have high ionization energy and often form covalent bonds by gaining or sharing electrons.

Question 6

In which of the following states can hydrogen form intermolecular hydrogen bonds?

I. Gaseous state

II. Liquid state

III. Solid state

TheoryPractice · Accepted Answer

II and III. Hydrogen bonds typically form in liquid and solid states where molecules are held closely together. In the gaseous state, molecules are too far apart to form stable hydrogen bonds, so statement I is false. Statements II and III are true as hydrogen can form these intermolecular bonds in both liquid and solid states.

Question 7

Which element from the provided data is most likely to form a stable compound by gaining electrons? Element Tendency Fluorine Gains electrons easily Sodium Loses electrons easily Carbon Shares electrons Neon Stable, does not gain or lose Potassium Loses electrons easily

TheoryPractice · Accepted Answer

Fluorine. Fluorine is highly electronegative and readily gains electrons to achieve a stable electron configuration, while the other elements are either more inclined to lose electrons, share electrons, or already stable as in the case of neon.

Question 8

Consider the synthetic element Xylenium, which has an electron configuration similar to carbon. Under what condition can Xylenium form multiple bonds with another element?

TheoryPractice · Accepted Answer

If Xylenium has enough valence electrons. Xylenium can form multiple bonds if it has sufficient valence electrons, similar to how elements like carbon and nitrogen can form double or triple bonds.

Question 9

If a nitrogen atom has five valence electrons, what is the maximum number of covalent bonds it can form?

TheoryPractice · Accepted Answer

3. Nitrogen has five valence electrons and needs three more to complete an octet, so it can form a maximum of three covalent bonds.

Question 10

Analyze the following table on ion charges and their physiological roles in neurons. Which cation is crucial for initiating action potentials? Ion Charge type Impact on Neuron Sodium (Na⁺) Positive Essential for action potentials Potassium (K⁺) Positive Regulates repolarization Chloride (Cl⊹) Negative Inhibitory synaptic transmission Calcium (Ca²⁺) Positive Neurotransmitter release

TheoryPractice · Accepted Answer

Sodium (Na⁺). Sodium (Na⁺) plays a critical role in depolarization, which is essential for the initiation of action potentials in neurons.

Anatomy & Physiology Exam Prep Exam Questions & Answers 2026 (11–20)

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