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practice questions

The band formed due to the overlapping of thick and thin myofilaments

I Band

Which of the following would not be functional characteristics of life?


Chromosomal centromeres split and chromosomes migrate to opposite ends of the cell in which of the following?


Spastic paralysis suggests involvement of the:

Upper Motor Neurons

Which one of the following statements is correct regarding diffusion?

The greater the concentration gradient, the faster the rate of diffusion.

Which statement is the most correct regarding transcription/translation?

The nucleotide sequence in a tRNA anticodon is an exact copy of the DNA triplet that coded for it except that uracil is substituted for thymine.

The subarachnoid space lies between what two layers of meninges?

arachnoid and dura

Most muscles contain:

a mixture of fiber types.

Select the correct statement about synapses.

The synaptic cleft prevents an impulse from being transmitted directly from one neuron to another.

________ is a suspension


The universal loss of bone mass seen in the skeleton, which begins about the age of 40:

reflects an imbalance in the bone remodeling process.

Smooth muscles that act like skeletal muscles but are controlled by autonomic nerves and hormones are

multiunit muscles

An individual accidentally transected the spinal cord between T1 and L2. This would result in


A contraction in which the muscle changes in length with the same tension applied to it is called:

isotonic contraction.

When acetylcholine diffuses across the synaptic cleft and binds to receptors on the folded sarcolemma it initially causes _______ channels to open in the sarcolemma.

chemically-gated Na+

The ventricles that lie within the cerebral hemispheres are the:

lateral ventricles.

The role of acetylcholinesterase is to:

destroy ACh a brief period after its release by the axonal endings.

A neuronal circuit that concentrates or directs a large number of incoming impulses to a rather small number of neurons is called a(n):

converging circuit.

Smooth muscle is significantly different from striated muscle in several ways. Which of the following is true?

Smooth muscle shortens and stretches to a greater extent than does striated muscle.

Which of the following statements is true concerning feedback mechanisms

Negative feedback mechanisms work to prevent sudden severe changes within the body.

One of the functional characteristics of life is irritability. This refers to:

sensing changes in the environment and then reacting or responding to them

Strong muscle contractions are controlled by:

increasing the voltage up to the maximum voltage

A rapid repetitive series of threshold stimuli leading to a single, fused, sustained contraction is:

sumation of contraction

Mitosis is:

division of a cell.

In the left cerebral hemisphere we possess areas functioning in speech. The area involved in comprehension of the written and spoken language is called:

Wernicke's area

Glycolysis is the only phase

that occurs in the cytoplasm.
that does not require oxygen.
that directly yields ATP

In the left cerebral hemisphere we possess areas functioning in speech. The area involved in comprehension of the written and spoken language is called:

Wernicke's area

Salts are always

Ionic compounds

An action potential

is essential for impulse propagation

The term pollex refers to the


The majority of ATP synthesis occurs during

electron transport chain

A coronal plane would divide the body:

vertically into anterior and posterior parts.

This occurs in the electron transport system.

anaerobic respiration

When a globular protein has its hydrogen bonds broken, it becomes


Which one of the following planes would result in sections containing both of the lungs and the heart? (Note: It could contain parts of both lungs and the heart.) 1. Coronal (=Frontal), 2. Transverse. 3. Saggital

1 & 2

Which of these would you not find in the cerebral cortex?

fiber tracts

All of the following are structures of the limbic system except

caudate nucleus

The membrane lining the medullary canal is the:


Which of the following is a principle of the fluid mosaic model of cell membrane structure

Phospholipids form a bilayer that is largely impermeable to water-soluble molecules

Which statement is not true concerning characteristics of life

Each organ system is isolated from all other body system

The numbers listed represent the first, second and third energy levels, respectively. On this basis, which of the following is an unstable or reactive atom?

2, 8, 1

Atom X has seventeen protons. How many electrons are in its valence shell


In bone formation, a deficiency of growth hormone will cause

decreased proliferation of the epiphyseal plate cartilage.

The vital centers for the control of heart rate, respiration and blood pressure are located in the


Which of the following is not a usual result of exercise

increase in the number of myofibrils within the muscle cells

The functions of centrioles include:

organizing the mitotic spindle in cell division.

The pancreas and liver work together to maintain homeostasis through:

negative feedback

One functional unit of a skeletal muscle is:

a sarcomere.

Which statement about enzymes is false?

Enzymes are Organic Catalysts

The disease in children called "rickets" is known as


The band composed only of thin myofilaments


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