Question 1

A patient is lying face up on an examination table with their palms facing forward. Which anatomical position and directional term best describes the location of the sternum relative to the heart?

Accepted Answer

The sternum is anterior to the heart in the anatomical position.

Question 2

Which of the following best describes the role of the pancreas in the human body?

Accepted Answer

It functions as both an endocrine gland (releasing hormones) and an exocrine gland (releasing digestive enzymes).

Question 3

A patient is diagnosed with a tumor located in the dorsal body cavity. Which organ is most likely affected?

Accepted Answer

Brain

Question 4

Which of the following scenarios best illustrates a negative feedback loop in homeostasis?

Accepted Answer

When blood glucose rises after a meal, insulin is released to lower blood glucose back to normal.

Question 5

If a cell is placed in a solution and water moves into the cell, causing it to swell, which term best describes the solution?

Accepted Answer

Hypotonic

Question 6

Which of the following best explains why cholesterol is an important component of the plasma membrane?

Accepted Answer

It stabilizes the membrane's fluidity, making it less permeable to very small water-soluble molecules.

Question 7

Which of the following chemical equations represents a dehydration synthesis reaction forming a disaccharide?

Accepted Answer

$$C_{6}H$$_{12}$$O_{6} + C$$_{6}$$H_{12}O$$_{6} \rightarrow $$C_{12}H$$_{22}$$O_{11} + H$$_{2}$$O$

Question 8

A solution has a pH of 5. How does its hydrogen ion concentration compare to a solution with a pH of 7?

Accepted Answer

It is 100 times higher.

Question 9

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

Accepted Answer

Ionic bonds involve the transfer of electrons, while covalent bonds involve the sharing of electrons.

Question 10

Which organelle is primarily responsible for producing ATP through aerobic respiration?

Accepted Answer

Mitochondrion

Question 11

A scientist observes that increasing the temperature of a reaction speeds up the rate at which products are formed. Which principle does this observation best illustrate?

Accepted Answer

Higher temperature increases the kinetic energy of molecules, leading to more frequent and energetic collisions.

Question 12

Which of the following is NOT a function of the plasma membrane?

Accepted Answer

Synthesizing proteins for export

Question 13

Which of the following best describes the relationship between codons and anticodons during protein synthesis?

Accepted Answer

Codons are sequences of three nucleotides on mRNA that pair with complementary anticodons on tRNA.

Question 14

A red blood cell is placed in a hypertonic solution. What will most likely happen to the cell?

Accepted Answer

It will shrink as water leaves the cell.

Question 15

Which of the following best describes the function of serous membranes?

Accepted Answer

They produce a lubricating fluid that reduces friction between organs within body cavities.

Question 16

Which of the following is a correct statement about homologous chromosomes in human cells?

Accepted Answer

Humans have 23 pairs of homologous chromosomes, one set from each parent.

Question 17

Which of the following best describes the process of facilitated diffusion across the plasma membrane?

Accepted Answer

It uses membrane proteins to move substances down their concentration gradient without energy input.

Question 18

Which of the following is a function of the Golgi apparatus?

Accepted Answer

Modifying, sorting, and packaging proteins for secretion

Question 19

Which of the following best explains why unsaturated fatty acids are typically liquid at room temperature?

Accepted Answer

Their double bonds create kinks, preventing tight packing of molecules.

Question 20

Which of the following is NOT part of the endomembrane system?

Accepted Answer

Mitochondrion

BIO 109: Study Guide for Exam 1 – Introduction to Anatomy, Physiology, and Chemistry of Life

Study Guide - Practice Questions

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