Q: Which of the following equations correctly represents the aerobic cellular respiration process in animals?

$$C_6H_{12}O_6$ + 6\ \mathrm{O}_2 \rightarrow 6\ \mathrm{CO}_2 + 6\ \mathrm{H}_2\mathrm{O} + \text{energy}$$

Question 1

Which of the following best describes the main function of xylem tissue in plants?

Accepted Answer

Transport of water and minerals from roots to shoots

Question 2

A student observes that a plant wilts during a drought. Which physiological process is most directly responsible for this wilting?

Accepted Answer

Loss of turgor pressure due to water loss

Question 3

Which equation correctly represents the process of photosynthesis in plants?

Accepted Answer

$$6\ \mathrm{CO}_2 + 6\ \mathrm{H}_2\mathrm{O} \rightarrow C_6H_{12}O_6$ + 6\ \mathrm{O}_2$$

Question 4

A plant is grown in soil lacking magnesium. Which process will be most directly affected?

Accepted Answer

Synthesis of chlorophyll

Question 5

Which of the following best explains why companion cells are essential for phloem function in plants?

Accepted Answer

They facilitate the loading and unloading of sugars into sieve tubes.

Question 6

A botanist cuts a ring of bark (including phloem but not xylem) from around a tree trunk. What is the most likely outcome for the tree below the cut?

Accepted Answer

Sugars produced in the leaves will not reach the roots.

Question 7

Which of the following is a correct sequence of events in the double fertilization process of angiosperms?

Accepted Answer

One sperm fertilizes the egg, another sperm fertilizes the central cell to form endosperm.

Question 8

Which of the following best describes the role of stomata in plant leaves?

Accepted Answer

Regulation of gas exchange and water loss

Question 9

A plant exposed to continuous light and no darkness fails to flower. Which plant behavior is most likely being disrupted?

Accepted Answer

Photoperiodism

Question 10

Which of the following best explains why animals require a circulatory system?

Accepted Answer

To transport oxygen, nutrients, and waste products throughout the body

Question 11

A patient is diagnosed with diabetes insipidus, a condition where the kidneys cannot concentrate urine. Which hormone is most likely deficient in this patient?

Accepted Answer

Antidiuretic hormone (ADH)

Question 12

Which of the following equations correctly represents the aerobic cellular respiration process in animals?

Accepted Answer

$$C_6H_{12}O_6$ + 6\ \mathrm{O}_2 ightarrow 6\ \mathrm{CO}_2 + 6\ \mathrm{H}_2\mathrm{O} + 	ext{energy}$$

Question 13

Which of the following best describes the function of the myelin sheath in animal nervous systems?

Accepted Answer

It increases the speed of nerve impulse transmission.

Question 14

A person is exposed to a novel virus and later produces antibodies against it. Which system is primarily responsible for this response?

Accepted Answer

Immune system

Question 15

Which of the following is a correct sequence for the passage of food through the human digestive tract?

Accepted Answer

Mouth → Esophagus → Stomach → Small intestine → Large intestine

Question 16

Which of the following best explains why marine bony fish must actively excrete salt through their gills?

Accepted Answer

They lose water to the environment by osmosis and gain excess salt.

Question 17

A person suffers a spinal cord injury and loses sensation in their legs but can still move them. Which part of the nervous system is most likely damaged?

Accepted Answer

Sensory neurons

Question 18

Which hormone is primarily responsible for stimulating the fight-or-flight response in humans?

Accepted Answer

Epinephrine (adrenaline)

Question 19

Which of the following best describes the sliding filament model of muscle contraction?

Accepted Answer

Actin and myosin filaments slide past each other, shortening the sarcomere.

BIOL 213: Principles of Biology III – Syllabus and Course Structure Overview

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