Question 1

Which of the following best explains why arteries have thicker walls than veins?

Accepted Answer

Arteries must withstand higher pressure generated by the heart during systole.

Question 2

During the cardiac cycle, which event directly follows ventricular systole?

Accepted Answer

Ventricular diastole

Question 3

A patient has a mutation that prevents the formation of functional SA (sinoatrial) node cells. Which of the following is the most likely consequence?

Accepted Answer

The heart will lose its ability to initiate rhythmic contractions, leading to arrhythmia.

Question 4

Which of the following best describes the difference between innate and adaptive immunity?

Accepted Answer

Innate immunity provides a rapid, non-specific response, while adaptive immunity is slower but highly specific to particular antigens.

Question 5

Which cell type is primarily responsible for the humoral immune response?

Accepted Answer

B lymphocytes (B cells)

Question 6

A person is exposed to a pathogen for the first time and develops symptoms after several days. Upon a second exposure months later, the person does not get sick. Which concept best explains this phenomenon?

Accepted Answer

Immunological memory

Question 7

Which of the following is a derived trait that distinguishes land plants from charophyte algae?

Accepted Answer

Alternation of generations

Question 8

In the alternation of generations in plants, which structure produces gametes, and by what process?

Accepted Answer

Gametophyte by mitosis

Question 9

Which of the following best describes double fertilization in angiosperms?

Accepted Answer

One sperm fertilizes the egg, and another sperm fuses with two polar nuclei to form the endosperm.

Question 10

Which of the following is a function of the Casparian strip in plant roots?

Accepted Answer

It forces water and solutes to cross the plasma membrane of endodermal cells, regulating entry into the vascular cylinder.

Question 11

A plant is observed to have parallel leaf venation, scattered vascular bundles in the stem, and a fibrous root system. To which group does it most likely belong?

Accepted Answer

Monocots

Question 12

Which of the following best explains why legumes are often used in crop rotation to improve soil fertility?

Accepted Answer

They form mutualistic relationships with nitrogen-fixing bacteria in root nodules, increasing soil nitrogen.

Question 13

Which of the following is the correct sequence of floral organs from the outside to the inside of a generalized flower?

Accepted Answer

Sepals, petals, stamens, carpels

Question 14

Which of the following best describes the cohesion-tension mechanism in xylem transport?

Accepted Answer

Water is pulled upward through the plant due to transpiration and the cohesive properties of water molecules.

Question 15

A plant cell is placed in a solution with a lower water potential than its cytoplasm. What will most likely happen?

Accepted Answer

The cell will lose water and become plasmolyzed.

Question 16

Which of the following is a correct comparison between xylem and phloem?

Accepted Answer

Xylem transports water and minerals from roots to shoots, while phloem transports sugars from sources to sinks.

Question 17

Which of the following best describes the process of clonal selection in adaptive immunity?

Accepted Answer

An antigen binds to a specific lymphocyte, stimulating it to divide and produce a population of identical cells.

Question 18

Which of the following is a function of the pericycle in plant roots?

Accepted Answer

It gives rise to lateral roots.

Question 19

A patient is diagnosed with a deficiency in platelets. Which of the following symptoms would most likely be observed?

Accepted Answer

Excessive bleeding due to impaired blood clotting

Question 20

Which of the following adaptations allows carnivorous plants to survive in nutrient-poor environments?

Accepted Answer

They obtain essential nutrients, especially nitrogen, by digesting insects and other small animals.

General Biology Study Guide: Circulatory System, Immune System, and Plant Biology

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