Test on Key Concepts in Biology

Question 1: When the body becomes too warm, human blood vessels near the skin's surface constrict to trap heat inside.

A. Ano

B. Ne

Explanation: If your blood is too warm, the blood vessels near the skin's surface dilate to release heat.

Question 2: Which statement accurately describes the function and characteristics of different skeletal joints based on the provided study materials?

A. Skeletal joints are primarily responsible for keeping bones aligned and allowing body movement, with fibrous joints being completely unmovable and found in the skull.

B. Cartilaginous joints, like those in the shoulder, are surrounded by a sac of lubricating fluid and allow movement in many directions.

C. Synovial joints are cushioned by cartilage discs and move only a little bit, such as the joints found in the spine.

D. Arthritis is a condition where joints become inflamed due to cartilage wearing down, but it only affects cartilaginous joints.

Explanation: The study materials state that joints keep bones aligned and allow movement, and specifically mention that fibrous joints are unmovable and found in the skull. Cartilaginous joints move only a little and are cushioned by cartilage discs (like in the spine), while synovial joints move in many directions and are surrounded by a sac of lubricating fluid (like the shoulder). Arthritis affects joints where cartilage wears down, causing bones to rub, and the materials do not limit it to only cartilaginous joints.

Question 3: Ernst Chain and Howard Florey successfully created a purified form of penicillin, tested it on patients, and mass-produced it with the government to save millions of soldiers' lives.

A. Ano

B. Ne

Explanation: Ernst Chain and Howard Florey successfully created a purified form of penicillin, tested it on patients, and worked with the government to mass-produce the drug to save millions of soldiers' lives.

Question 4: Based on the provided study materials, what distinguishes synthetic antibiotics from natural antibiotics?

A. Synthetic antibiotics are exclusively used to treat drug-resistant bacteria, whereas natural antibiotics are not.

B. Synthetic antibiotics are created artificially by scientists in laboratories, while natural antibiotics are obtained directly from nature.

C. Natural antibiotics are only found in rainforest plants, and synthetic antibiotics are derived from animal sources.

D. Synthetic antibiotics are a purified form of penicillin, while natural antibiotics are a new strain of drug-immune bacteria.

Explanation: The study materials state: 'Synthetic antibiotics are manufactured artificially by scientists in laboratories, while natural antibiotics are sourced directly from nature, such as rain forest plants.' This directly matches option 1. The other options introduce information not present in the study materials or misrepresent the definitions.

Question 5: When building a circular orb web, a spider first creates the suspended Y-shape before releasing a single line into the wind to form a bridge.

A. Ano

B. Ne

Explanation: The spider first releases a single line into the wind to form a bridge, then crosses it to reinforce it, and only after that spins more silk to make a suspended Y-shape.