Speciation that occurs when a population is divided by a geographical barrier such as a mountain range is called ____.
Correct answer B. allopatric speciation
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MDCAT Biology MCQs
Page 19 of MDCAT Biology multiple-choice questions with answers. Tap an option to check yourself.
Page 19 of 54
- Biological Molecules 74
- Coordination and Control 72
- Biology Diagnostic 70
- Cell Structure and Function 67
- Biotechnology 65
- Reproduction 58
- Bioenergetics 55
- Circulation 50
- Inheritance 48
- Digestion 45
- Immunity 45
- Support and Movement 45
- Acellular Life (Viruses) 45
- Homeostasis 45
- Respiration and Gaseous Exchange 45
- Evolution 45
- Enzymes 45
- Cell Cycle 41
- Chromosome and DNA 40
- Biology Introduction 38
- Ecosystem 27
Many new plant species have arisen in a single generation without geographical isolation. The most common mechanism is ____.
Correct answer D. polyploidy
A horse and a donkey can mate to produce a mule, but mules are sterile. This is an example of which reproductive isolating mechanism?
Correct answer A. Hybrid sterility (post-zygotic isolation)
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Two frog species in the same pond breed in different months of the year and so do not interbreed. This is ____.
Correct answer D. temporal isolation
The biological species concept defines a species as a group of organisms that ____.
Correct answer C. can interbreed to produce fertile offspring
How many bones make up the axial skeleton of an adult human?
Correct answer B. 80
Which of the following is part of the appendicular skeleton?
Correct answer A. Clavicle
How many pairs of ribs are present in a normal human?
Correct answer B. 12
Which type of cartilage forms the C-shaped rings of the trachea and covers the articulating ends of bones?
Correct answer A. Hyaline cartilage
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The external ear (pinna) and the epiglottis are supported by ____.
Correct answer B. elastic cartilage
Which type of cartilage forms the intervertebral discs and the pubic symphysis?
Correct answer B. Fibrocartilage
Cartilage heals slowly after injury mainly because it ____.
Correct answer A. lacks blood vessels
Mature cartilage cells that lie in small spaces called lacunae within the matrix are ____.
Correct answer B. chondrocytes
Which bone cells break down bone matrix and release calcium into the blood?
Correct answer D. Osteoclasts
Which cells secrete new bone matrix (osteoid) during bone formation?
Correct answer A. Osteoblasts
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The structural unit of compact bone, made of concentric lamellae around a central canal, is called ____.
Correct answer C. the Haversian system (osteon)
Channels that run at right angles to Haversian canals and connect them with each other and with the bone surface are ____.
Correct answer A. Volkmann's canals
The hard mineral that gives bone its rigidity is mainly ____.
Correct answer A. calcium phosphate in the form of hydroxyapatite
In adults, red bone marrow that produces blood cells is found mainly in ____.
Correct answer D. spongy bone of flat bones such as the sternum and pelvis
Which property distinguishes bone from cartilage?
Correct answer C. Bone has a mineralised matrix and a rich blood supply