NCLEX : General Biology

Study concepts, example questions & explanations for NCLEX

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Example Questions

Example Question #251 : General Biology

Individuals who grind their teeth are at risk of causing damage to which of the following joints?

Possible Answers:

The temporomandibular joint

The pisotriquetral joint

The xiphisternal joint

The intermetacarpal joint

Correct answer:

The temporomandibular joint

Explanation:

Bruxism, or involuntary tooth grinding, can cause inflammation and damage in the temporomandibular joint, which is the articulation between the condyle of the mandible and the temporal bone. 

The xiphisternal joint is between the xiphoid process and the body of the sternum. The intermetacarpal joints are formed between the metacarpal bones of the hand, and the pisotriquetral joint is between the pisiform and triquetrum of the wrist.

Example Question #1 : Joints

Which of the following is a term for movement along a sagittal plane that decreases the angle between bones?

Possible Answers:

Adduction

Extension

Flexion

Abduction

Correct answer:

Flexion

Explanation:

Movement along a sagittal plane that decreases the angle between bones is flexion. This is in contrast to extension, which is movement along a sagittal plane that increases the angle between bones. Adduction is movement that pulls a structure toward the midline of the body, while abduction moves a structure away from midline.

Example Question #6 : Joints

Which of the following joints is capable of circumduction?

Possible Answers:

The elbow

The knee

The shoulder

The sacroiliac joint

Correct answer:

The shoulder

Explanation:

Circumduction is movement that produces a circular motion wth the distal end of a body part. True circumduction allows for a 360 degree range of movement. Of the joints listed, the only one capable of circumduction is the shoulder. 

Example Question #251 : General Biology

Which of the following is an example of a condyloid joint?

Possible Answers:

The metacarpophalangeal joints

The acromioclavicular joint

The glenohumeral joint

The humeroradial joint

Correct answer:

The metacarpophalangeal joints

Explanation:

Condyloid joints are a form of synovial joint in which a condyle rests in an ovoid cavity. Of the joints listed, the only condyloid joint is the metacarpophalangeal joints (the joint of the most proximal knuckle).

The acromioclavicular joint is a plane joint, while the glenohumeral and humeroradial joints are both ball and socket joints.

Example Question #8 : Joints

The patella articulates with which of the following bones?

Possible Answers:

The tibia

The femur

The fibula

The tibia and fibula

Correct answer:

The femur

Explanation:

The only bone that the patella, or kneecap, articulates with is the femur, at the patellofemoral joint. The patella is a sesamoid bone, meaning it is fully embedded within a tendon. The patellar ligament joins the patella to the tibial tuberosity (but not the fibula).

Example Question #7 : Joints

Which of the following are three structural classifications of joints?

Possible Answers:

Sutures, syndesmosis, gomphosis

Synarthrosis, ampiarthrosis, and diarthrosis

Condyloid, gliding, and hinge

Fibrous, cartilaginous, and synovial

Correct answer:

Fibrous, cartilaginous, and synovial

Explanation:

The structural classification of joints divides them according to the form of tissue that connects bones to each other. The three structural divisions of joints are fibrous, cartilaginous, and synovial. In contrast, synarthrosis, amphiarthrosis, and diarthrosis are all classifications of a joint's movement.

Condyloid, gliding, and hinge joints are all types of synovial joints, while sutures, syndesmosis, and gomphosis are all types of fibrous joints.

Example Question #2 : Joints

Gomphosis joints are fibrous joints found between the __________.

Possible Answers:

tooth and socket

tibia and fibula

skull bones

radius and the ulna

Correct answer:

tooth and socket

Explanation:

Gomphosis joints are fibrous joints that attach the root of the tooth to the bony socket of the mandible or maxilla. 

Both the tibio-fibular joint and the joint between the radius and ulna are syndesmoses, while the joints between the bones of the skull are sutures.

Example Question #11 : Joints

__________ joints make up the majority of the joints of the human body.

Possible Answers:

Fibrous

Synarthrosis

Synovial

Amphiarthrosis

Cartilaginous 

Correct answer:

Synovial

Explanation:

The majority of joints of the human body are synovial joints. These joints are diarthrotic and include a synovial joint capsule that allows for greater freedom of movement. Examples include the fingers and the elbows, the knees, the temporomandibular joint, and the hips. 

Fibrous and cartilagenous joints, all of which are either synarthrotic or amphiarthrotic, are relatively less common.

Example Question #1 : Endocrine And Immune Systems

What nutrients are specifically needed for proper thyroid hormone production?

Possible Answers:

Iodine and manganese

Methionine and magnesium

Tyrosine, iodine, and selenium

Iron, manganese, and biotin

Correct answer:

Tyrosine, iodine, and selenium

Explanation:

The nutrients specifically required for thyroid hormone production are tyrosine, iodine, and selenium, in addition to zinc and several B vitamins. While magnesium, manganese, and methionine are all essential for metabolism and overall hormone production, they are not direct substrates or cofactors in the production of thyroid hormone.

Example Question #1 : Endocrine And Immune Systems

What is selenium’s role in thyroid hormone production?

Possible Answers:

Synthesis of T3

Conversion of T4 to T3

Synthesis of T4

Conversion of phenylalanine into tyrosine

Correct answer:

Conversion of T4 to T3

Explanation:

Selenium is essential for conversion of T4 to T3. Deiodinase enzymes, which remove iodine from T4 during conversion into T3, are selenium dependent. Tyrosine and iodine are both required for synthesis of T4, and iron is the cofactor for conversion of phenylalanine into tyrosine.

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