Homeostasis is defined as:

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

Answer Explanation:

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.

Therefore, the Correct Answer is D.

Q #1: What is the typical way a solid would turn to a liquid and then to a gas?

A. Vaporizing, then melting

B. Melting, then freezing

C. Vaporizing, then freezing

D. Melting, then vaporizing

Answer Explanation

A solid turns into a liquid by melting, and a liquid turns into gas by vaporization.
Q #2: How many tissue layers does the uterus have?

A. One

B. Two

C. Three

D. Four

Answer Explanation

The uterus has three layers. The inner layer is called the endometrium. The middle layer is called the myometrium. The outer layer of the uterus is called the serosa or perimetrium.
Q #3: What type of mutation is represented by the following sequence? Original: 123456 Mutated: 154326

A. Breakage

B. Deletion

C. Insertion

D. Inversion

Answer Explanation

An inversion mutation is represented in the sequence 1 5 4 3 2 6. An inversion error is a type of mutation where an entire sequence of DNA is reversed. In this case, 2 3 4 5 has been reversed to 5 4 3 2.

Breakage, choice A, in a gene can mess up its function entirely or lead to a translocation of genetic information. Choice B, deletion, is when a section of DNA is omitted or lost.

Choice C, Insertion, is when an extra base pair is added to a DNA sequence. Deletions and insertions can lead to a frameshift effect where entire sequences are thrown off because one nucleotide is wrong.

This could result in coding for the wrong amino acid and non-functioning proteins.

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Homeostasis is defined as:

More Questions on TEAS 7 Science

Q #1: What is the typical way a solid would turn to a liquid and then to a gas?

Answer Explanation

Q #2: How many tissue layers does the uterus have?

Answer Explanation

Q #3: What type of mutation is represented by the following sequence? Original: 123456 Mutated: 154326

Answer Explanation

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