How many tissue layers does the uterus have?

A. Neutrons

B. Transitory electrons

C. Valence electrons

D. Electrical charges

An ionic bond forms when one atom donates an electron from its outer shell, called a valence electron, to another atom to form two oppositely charged atoms.

A. Left atrium

B. Right atrium

C. Left ventricle

D. Right ventricle

Of the four heart chambers, the left ventricle is the largest. When it contracts, it pushes blood out to the organs and extremities of the body. The right ventricle pushes blood into the lungs. The atria, on the other hand, receive blood from the outlying parts of the body and transport it into the ventricles.

The basic process works as follows: Oxygen-poor blood fills the right atrium and is pumped into the right ventricle. from which it is pumped into the pulmonary artery and on to the lungs. In the lungs, this blood is oxygenated. The blood then reenters the heart at the left atrium, which, when full, pumps into the left ventricle. When the left ventricle is full, blood is pushed into the aorta and on to the organs and extremities of the body.

A. Ability of human beings to keep body weight within normal limits

B. Maintenance of a constant external temperature inside a room

C. Ingestion of enough food to keep hunger pains from developing

D. Tendency of the body to maintain a stable environment

Homeostatic mechanisms are involuntary actions by organs, glands, tissues and cells to maintain balance within the body. If a function is disrupted the body will readjust in an attempt to maintain balance. During periods of starvation the body will break down glucose reserves in order to maintain normal glucose levels.

A. Plasmas are high-temperature collections of ions and free electrons.

B. Solids are the least compressible due to the more rigid positions of the particles.

C. Gases have no definite volume and expand to fill their containers

D. Liquids have no definite shape and no definite volume.

Liquids have no definite shape, but they do have a definite volume. While the particles of liquids move more freely than those in solids, they do maintain a definite volume.

A. Upper-right corner

B. Upper-left corner

C. Bottom-left corner

D. Bottom-right comer

In general, atomic radius increases moving down a group due to the increasing number of electron shells. In general, atomic radius decreases moving from left to right across a period due to the increasing number of protons in the energy level. Therefore, atoms of elements in the bottom-left corner of the periodic table tend to have the largest atomic radii.

A. The patient looks like he needs this test.

B. The doctor feels that the patient needs this test.

C. The patient's symptoms and health history suggest that this test will enable the correct diagnosis to help the patient.

D. The patient has excellent insurance that will pay for several tests, and the doctor would like to run as many tests as possible.

A scientific argument should be based on measurable and observable facts such as the patient's current symptoms and health history. Discussing the patient's appearance or the doctor's feelings does not communicate a scientific argument. While insurance may be a factor in most healthcare systems, the status of the patient's Insurance does not communicate a scientific argument that justifies the need for the test

A. One

B. Two

C. Four

D. Eight

There are four different nucleotides in DNA. Nucleotides are monomers of nucleic acids, composed of five- carbon sugars, a phosphate group, and a nitrogenous base. Nucleotides make up both DNA and RNA. They are essential for the recording of an organism's genetic information, which guides the actions of the various cells of the body.

A. Independent variable

B. Dependent variable

C. Trial

D. Hypothesis

A hypothesis is the use of prior knowledge in order to provide a hypothetical explanation for why something may or may not occur. A hypothesis can be proved wrong or right based on the results of the experiment and repeated trials.

A. Area A

B. Area B

C. Area C

D. Area D

Area B is a synaptic vesicle where the neurotransmitters are stored just before use.

A. Two genes next to each other on a chromosome

B. Two genes on opposite ends of a chromosome

C. Flower color and height in snapdragons

D. Seed color and flower color in peas

Two genes next to each other (or within a specified close distance) are said to be linked. Linked genes do not follow the law of Independent assortment because they are too close together to be segregated from each other in meiosis.