Question 1

Pancreatic acinar cells are specialized for secreting digestive enzymes ultimately into the small intestine. This specialization reflects an elaboration of which of the following basic cell functions?

Accepted Answer

Pancreatic acinar cells are specialized for secreting digestive enzymes ultimately into the small intestine. This specialization reflects an elaboration of the basic cell function of controlling movement of materials between the cell and its environment.

Question 2

Which of the following body parameters is NOT homeostatically maintained?

Accepted Answer

Urine volume is not homeostatically maintained; it varies based on fluid intake, diet, and the body's need to eliminate waste products. The other options (A-D) are parameters that the body actively regulates to maintain within a narrow range for proper physiological function.

Question 3

Based on phylogenetic analysis, to which of the following phyla are chordates most closely related?

Accepted Answer

Chordates are most closely related to Echinodermata, as both are part of the Deuterostomia group, distinguished by their embryonic development patterns.

Question 4

The parathyroid gland, which secretes parathyroid hormone, is an organ comprising mainly tissue.

Accepted Answer

The parathyroid gland is primarily made up of epithelial cells, which are responsible for producing and secreting parathyroid hormone. This hormone plays a crucial role in regulating calcium levels in the blood.

Question 5

Salivary glands, which secrete amylase into the oral cavity, comprise _______________ tissue.

Accepted Answer

Salivary glands are made up of epithelial tissue, which is responsible for the secretion of substances such as enzymes, in this case, amylase.

Question 6

Which statement about a feedforward system is true?

Accepted Answer

Feedforward systems are designed to anticipate and respond to disturbances before they affect the system, thus reducing the delay in response often seen in feedback systems. The insulin response to food ingestion is an example of a biological feedforward mechanism, where the body anticipates the need for insulin to manage the incoming glucose.

Question 7

Which of the following terms have NO relationship?

Accepted Answer

All the pairs listed have relationships. Analogous traits often result from independent evolution. Chordata are characterized by having a dorsal notochord at some stage of development. Dormancy can be a form of acclimatization to unfavorable environmental conditions. Acclimation often involves adjusting to a new range of environmental conditions and is typically studied in a controlled environment.

Question 8

Which of the following statements is true?

Accepted Answer

All statements are true. The spine did evolve as an adaptation for swimming in fish, providing structural support and flexibility. Organisms do have vestigial genes, which are remnants of evolutionary history that no longer serve a function. Enantiostasis involves the maintenance of metabolic and physiological functions in response to changes in environmental variables, which can indeed involve changes in two or more variables.

Question 9

Glial cells of the brain are remarkable for their ability to avoid exploding when they are placed in distilled water. This ability comes in part as a consequence of activating ion transport mechanisms that enable them to control cell volume. This activity is an example of

Accepted Answer

The activity described is an example of self-regulation, as the glial cells are actively controlling their internal environment (specifically, their cell volume) in response to changes in their external environment (being placed in distilled water). This is a regulatory process to maintain homeostasis, not self-organization, self-support, or self-replication.

Question 10

Which of the following exemplify the basic cellular function of structural "self-support and movement"?

Accepted Answer

All the options listed (A through D) exemplify the basic cellular function of structural "self-support and movement." Ciliary and flagellar beating are movements for propulsion in different cellular contexts, microvilli provide structural support and increase surface area for absorption, and muscle contraction is a fundamental movement function in many organisms.

Question 11

Which of the following is considered to be homeostatic?

Accepted Answer

The answer of Which of the following is considered to...

Question 12

Smaller birds tend to lay smaller eggs with a smaller yolk supply than larger birds. This would be recognized as an example of

Accepted Answer

This is an example of a cost-benefit trade-off because smaller birds lay smaller eggs with less yolk to balance the energy and resources they can invest in reproduction with the survival needs of their offspring.

Question 13

The presence of mitochondria in virtually all eukaryotic cells is attributed to the historical existence of bacterial endosymbionts which invaded ancestral eukaryotes. This explanation could be considered

Accepted Answer

The explanation is evolutionary because it describes how mitochondria originated from bacterial endosymbionts through a process of evolution and symbiosis.

Question 14

Pronghorn antelopes are able to run at high altitudes where oxygen is scant relative to low altitudes for long periods of time. This ability is attributed to the superabundance of mitochondria in their limb muscles. This explanation could be considered

Accepted Answer

The explanation is mechanistic because it describes how the presence of a large number of mitochondria in the limb muscles of pronghorn antelopes enables them to run at high altitudes by efficiently using the available oxygen. This focuses on the biological mechanism that allows for this capability.

Question 15

Organisms, like the arctic fox, that live in cold environments have evolved counter-current heat exchangers in their limbs to help maintain their body temperature at a level well above the ambient temperature. This explanation could be considered

Accepted Answer

The answer of Organisms, like the arctic fox, that live...

Question 16

Insulin is secreted from the pancreatic islets of Langerhans in response to elevated levels of glucose in the blood plasma. The effect of insulin is to stimulate cells to take up glucose (out of the plasma), resulting in decreased plasma glucose levels. This system is an example of the physiological principle of

Accepted Answer

The system described is an example of homeostasis, which is the body's ability to maintain a stable internal environment (such as blood glucose levels) in response to changes in external conditions.

Question 17

An unreferenced negative feedback system will include

Accepted Answer

The answer of An unreferenced negative feedback system will include
...

Question 18

Biological features are the result of variation and natural selection.

Accepted Answer

Biological features evolve through the process of variation, where genetic differences occur within a population, and natural selection, where environmental pressures lead to the survival and reproduction of individuals best adapted to those conditions, thereby shaping the biological features of organisms over generations.

Question 19

In a evolutionary tree constructed using morphological and molecular data, annelids 
 would be more closely related to mollusks nematodes.

Accepted Answer

Annelids and mollusks are both part of the Lophotrochozoa group, indicating they share a closer evolutionary relationship with each other than either does with nematodes, which are part of the Ecdysozoa group.

Question 20

In populations where social homeostasis is evident, an increase in population density 
 would likely trigger a response within the colony causing a reduction in breeding.

Accepted Answer

In populations exhibiting social homeostasis, mechanisms are in place to maintain stability within the community. An increase in population density can lead to stress on resources and space, prompting the colony to naturally reduce breeding rates to prevent overpopulation and maintain balance.

Quiz 1: Homeostasis and Integration: The Foundations of Physiology