Question 1

Which of the following best describes a negative feedback loop in human physiology?

Accepted Answer

A process where the response opposes the original stimulus, helping to maintain homeostasis.

Question 2

A patient is experiencing a drop in blood glucose levels. Which of the following best illustrates the body's use of a negative feedback mechanism to restore homeostasis?

Accepted Answer

The pancreas releases glucagon, causing the liver to release glucose into the blood.

Question 3

Which of the following is the correct order of structural organization in the human body, from simplest to most complex?

Accepted Answer

Atom, molecule, cell, tissue, organ, organ system, organism

Question 4

A molecule of water ($$\mathrm{H_2O}) is $$held together by which type of bond?

Accepted Answer

Covalent bond

Question 5

Which of the following best describes the difference between saturated and unsaturated fatty acids?

Accepted Answer

Saturated fatty acids have only single bonds between carbon atoms, while unsaturated fatty acids contain one or more double bonds.

Question 6

If an atom has an atomic number of 8 and a mass number of 16, how many neutrons does it have?

Accepted Answer

$$16 - 8 = 8$$ neutrons

Question 7

Which of the following is an example of an endergonic chemical reaction in the human body?

Accepted Answer

The synthesis of proteins from amino acids

Question 8

A patient is given a solution with a pH of 4. Which of the following statements is correct?

Accepted Answer

The solution is acidic and has a high concentration of $$\mathrm{H^+}$$ ions.

Question 9

Which of the following best describes the relationship between ATP and nucleotides?

Accepted Answer

ATP is a type of nucleotide that stores energy in its phosphate bonds.

Question 10

Which of the following is NOT a characteristic of living things?

Accepted Answer

Inability to respond to stimuli

Question 11

A molecule with the formula $$\mathrm{C$$_{6}$$H_{12}O$$_{6}}$ is classified as which type of organic compound?

Accepted Answer

Carbohydrate

Question 12

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

Accepted Answer

It has a partial positive charge on the hydrogen atoms and a partial negative charge on the oxygen atom.

Question 13

Which of the following best describes the difference between an ionic bond and a covalent bond?

Accepted Answer

An ionic bond involves the transfer of electrons, while a covalent bond involves the sharing of electrons.

Question 14

A patient is suffering from dehydration. Which type of chemical reaction is most likely to be inhibited in their body?

Accepted Answer

Decomposition (hydrolysis) reactions

Question 15

Which of the following best describes the function of enzymes in the human body?

Accepted Answer

Enzymes decrease the activation energy required for chemical reactions.

Question 16

Which of the following is a correct statement about the four levels of protein structure?

Accepted Answer

The primary structure is determined by the sequence of amino acids.

Question 17

A molecule of DNA is composed of which of the following building blocks?

Accepted Answer

Nucleotides

Question 18

Which of the following best describes a positive feedback loop?

Accepted Answer

A process that amplifies a change in a controlled condition, often moving the system away from homeostasis.

Question 19

Which of the following is a correct example of a positive feedback loop in the human body?

Accepted Answer

Blood clotting after a vessel is damaged

Question 20

If a neutral atom of sodium ($$\mathrm{Na}) $$has an atomic number of 11, how many electrons does it have?

Accepted Answer

$$11$$ electrons

Anatomy & Physiology: Introduction and Chemistry of Life – Study Guide

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