Question 1

Which of the following best explains why fungi are critical to the carbon cycle in terrestrial ecosystems?

Accepted Answer

Fungi break down lignin and cellulose, releasing carbon from plant material back into the atmosphere as CO$$_2.$$

Question 2

A paleontologist discovers a sedimentary rock layer containing a unique fossil species that is found only in rocks of a specific age worldwide. This fossil is most likely:

Accepted Answer

An index fossil

Question 3

Which of the following statements about the law of superposition is correct?

Accepted Answer

Younger rock layers are found above older layers.

Question 4

Which animal group is characterized by a segmented body and jointed appendages?

Accepted Answer

Arthropoda

Question 5

A researcher is studying an animal with bilateral symmetry, three germ layers, and a true coelom. Which of the following animals fits this description?

Accepted Answer

Earthworm (Annelida)

Question 6

Which of the following best describes the relationship between surface area ($$A$$), volume ($$V$$), and cell size?

Accepted Answer

As cell size increases, the surface-area-to-volume ratio decreases.

Question 7

Which of the following equations correctly represents the relationship used in radiometric dating to determine the age of a rock sample?

Accepted Answer

$$N = N_0$ e$$^{-\lambda t}$$

Question 8

A marine bony fish is placed in freshwater. What is the most likely physiological response?

Accepted Answer

It will gain water by osmosis and excrete large amounts of dilute urine.

Question 9

Which of the following best explains why desert mammals can produce more concentrated urine than humans?

Accepted Answer

They have a longer loop of Henle, increasing the osmotic gradient in the medulla.

Question 10

Which mechanism of heat exchange is primarily responsible for a lizard warming itself on a sunlit rock?

Accepted Answer

Radiation

Question 11

Which of the following statements about countercurrent exchange in fish gills is correct?

Accepted Answer

Blood and water flow in opposite directions, maintaining a gradient for oxygen diffusion.

Question 12

Which equation represents the ideal gas law, which is relevant to understanding ventilation in animals?

Accepted Answer

$$PV = nRT$$

Question 13

A patient is experiencing low blood pH due to elevated CO$$_2$$ levels. According to the following reaction, what is the physiological response?

$$\mathrm{CO_2$ + H_2O \rightleftharpoons $$HCO_3$$^- + H^+}$$

Accepted Answer

Ventilation rate increases to expel more CO$$_2$$ and raise pH.

Question 14

Which of the following best describes the role of the sodium–potassium pump ($$\mathrm{Na^+/K^+}-$$ATPase) in maintaining the resting membrane potential of a neuron?

Accepted Answer

It moves 3 $$\mathrm{Na^+}$$ ions out and 2 $$\mathrm{K^+}$$ ions in, creating a negative charge inside the cell.

Question 15

Which of the following is a key difference between the sympathetic and parasympathetic divisions of the autonomic nervous system?

Accepted Answer

The sympathetic division increases heart rate, while the parasympathetic division decreases it.

Question 16

Which of the following best explains why complete metamorphosis can be advantageous for insects?

Accepted Answer

Larvae and adults occupy different ecological niches, reducing competition for resources.

Question 17

Which of the following best describes the difference between oviparity, ovoviviparity, and viviparity?

Accepted Answer

Oviparous animals lay eggs that develop outside the mother's body; ovoviviparous animals retain eggs internally without direct nourishment; viviparous animals provide direct nourishment to embryos inside the mother.

Question 18

Which of the following is a correct statement about hormone signaling pathways?

Accepted Answer

Neuroendocrine signaling involves a neuron releasing a hormone into the bloodstream.

Question 19

Which of the following best describes the function of the loop of Henle in the mammalian kidney?

Accepted Answer

It creates a concentration gradient in the medulla, allowing for water reabsorption and concentrated urine.

Question 20

Which of the following is a real-world example of negative feedback maintaining homeostasis?

Accepted Answer

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

BIO 201 Exam 3: General Biology II – Study Guide Notes

Guida di studio - Domande di pratica

Study guide - Flashcard