$$\mathrm{C_6H_{12}O_6$ + 6O_2 \rightarrow 6CO_2 + 6H_2O + \text{energy} (ATP)}$$

Question 1

Which of the following best describes the molecule shown in the first image?

Accepted Answer

A nucleotide, consisting of a phosphate group, a 5-carbon sugar, and a nitrogenous base.

Question 2

In the nephron diagram (third image), what is the primary function of the Loop of Henle?

Accepted Answer

To concentrate urine by reabsorbing water and salts.

Question 3

Which process is primarily responsible for the movement of water from the roots to the leaves in plants?

Accepted Answer

Transpiration, driven by evaporation and the cohesion-tension mechanism.

Question 4

Which of the following equations correctly represents aerobic respiration?

Accepted Answer

$$\mathrm{C_6H_{12}O_6$ + 6O_2 ightarrow 6CO_2 + 6H_2O + 	ext{energy} (ATP)}$$

Question 5

A marine fish is an example of which osmoregulatory strategy?

Accepted Answer

Osmoconformer, maintaining internal osmolarity similar to the environment.

Question 6

Which nitrogenous waste is most energy-intensive to produce but conserves the most water?

Accepted Answer

Uric acid

Question 7

In the nephron, which process is responsible for returning useful solutes like glucose and amino acids to the blood?

Accepted Answer

Reabsorption

Question 8

Which adaptation allows desert mammals to conserve water most efficiently?

Accepted Answer

Long loops of Henle in their nephrons

Question 9

What is the main function of capillaries in the circulatory system?

Accepted Answer

To facilitate exchange of gases, nutrients, and waste between blood and tissues.

Question 10

Which of the following best explains why you cannot move a freshwater fish into a marine environment?

Accepted Answer

Freshwater fish are osmoregulators adapted to low osmolarity and would lose water rapidly in a marine environment.

Question 11

Which of the following is a correct sequence of excretory processes in the nephron?

Accepted Answer

Filtration → Reabsorption → Secretion → Excretion

Question 12

Which structure in the nephron is primarily responsible for filtration of blood plasma?

Accepted Answer

Bowman's capsule and glomerulus

Question 13

Which of the following best describes the movement of water during osmosis?

Accepted Answer

From an area of high water concentration to an area of low water concentration across a semipermeable membrane.

Question 14

Which of the following is a real-life example of counter-current exchange in animals?

Accepted Answer

Oxygen uptake in fish gills

Question 15

Which vessel carries oxygenated blood away from the heart in the human circulatory system?

Accepted Answer

Artery

Question 16

What is the main function of stomata in plant leaves?

Accepted Answer

To regulate gas exchange and water loss.

Question 17

Which process in plants is responsible for the movement of sugars from leaves to other parts of the plant?

Accepted Answer

Translocation in the phloem

Question 18

Which of the following best explains why birds excrete uric acid instead of urea or ammonia?

Accepted Answer

Uric acid is less toxic and conserves water, which is important for birds with limited access to water.

Question 19

A plant with wilted leaves (as shown in the second image, left) is most likely experiencing which condition?

Accepted Answer

Loss of turgor pressure due to water loss in a hypertonic environment.

Question 20

Which of the following best describes the role of the collecting duct in the nephron?

Accepted Answer

It collects urine from multiple nephrons and regulates final water reabsorption.

Exchange and Transport in Animals: Osmoregulation, Excretion, and Gas Exchange

Study Guide - Practice Questions