Question 1

Which of the following best describes the central role of evolution in biological sciences?

Accepted Answer

Evolution explains the diversity of life and the adaptations organisms have to their environments.

Question 2

Which of the following is a disadvantage of terrestrial environments compared to aquatic environments for multicellular organisms?

Accepted Answer

Greater risk of desiccation due to exposure to air.

Question 3

A student traces the route of a bolus of food through the human digestive system. Which of the following correctly lists the order of organs the food passes through?

Accepted Answer

Mouth → Esophagus → Stomach → Small Intestine → Large Intestine → Rectum

Question 4

Which of the following best explains how a vaccine works to protect against disease?

Accepted Answer

A vaccine introduces antigens that stimulate the immune system to produce memory cells.

Question 5

Which of the following is an example of negative feedback in homeostatic regulation?

Accepted Answer

The release of insulin in response to high blood glucose, which lowers blood glucose levels.

Question 6

Which equation best represents the calculation of the average (mean) of a set of physiological measurements $$x_1$$, $$x_2$$, ..., x_n$$?

Accepted Answer

$$\displaystyle \bar{x} = \frac{1}{n} \sum_{i=1}^{n} x_i$$

Question 7

A patient consumes a diuretic. Which of the following best explains the physiological effect on urine output?

Accepted Answer

Diuretics decrease water reabsorption in the kidneys, leading to increased urine output.

Question 8

Which of the following best describes the role of calcium in excitation-contraction coupling in vertebrate striated muscle?

Accepted Answer

Calcium binds to troponin, causing a conformational change that allows myosin to bind to actin.

Question 9

Which of the following scenarios best illustrates the adaptive significance of a plant's response to an external stimulus?

Accepted Answer

A sunflower rotates its head to follow the sun, maximizing photosynthesis.

Question 10

Which of the following best describes the function of the human cerebellum?

Accepted Answer

Coordination of voluntary movements and balance.

Question 11

Which of the following correctly describes the pattern of ion channel activity during the rising phase of an action potential?

Accepted Answer

Voltage-gated sodium channels open, allowing $$\mathrm{Na^+} to $$enter the neuron.

Question 12

Which of the following is a similarity in the development of basic body plans of plants and animals?

Accepted Answer

Both involve regulated patterns of gene expression that control development.

Question 13

Which of the following best describes the route and mechanism of water transport in vascular plants?

Accepted Answer

Water moves from roots to leaves through xylem by transpiration pull and cohesion-tension.

Question 14

Which of the following is a correct statement about the hormonal control of the human menstrual cycle?

Accepted Answer

A surge in luteinizing hormone (LH) triggers ovulation.

Question 15

Which of the following best explains the adaptive significance of negative feedback in homeostatic mechanisms?

Accepted Answer

Negative feedback maintains internal stability by counteracting deviations from a set point.

Question 16

A student is asked to calculate the standard deviation of a set of physiological data. Which formula should they use?

Accepted Answer

$$\displaystyle s = \sqrt{\frac{1}{n-1} \sum_{i=1}^{n} (x_i - \bar{x})^2$}$$

Question 17

Which of the following best describes the function of the phloem in vascular plants?

Accepted Answer

Transport of sugars and other organic nutrients from sources to sinks.

Question 18

Which of the following is a correct comparison between marine and freshwater environments for multicellular organisms?

Accepted Answer

Marine environments are generally more stable in temperature and salinity than freshwater environments.

Question 19

Which of the following best describes the process of gas exchange in animal lungs?

Accepted Answer

Oxygen diffuses from alveoli into capillaries, while carbon dioxide diffuses from capillaries into alveoli.

Biology 115: Organismal Form and Function – Syllabus Study Guide

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