An Atom Consists of

question 90

Multiple Choice

An atom consists of

• A) negatively charged electrons moving around a very small but massive, positively charged nucleus.
• B) neutrons orbiting an electrically neutral nucleus composed of protons and electrons.
• C) positive protons, neutral neutrons, and negative electrons orbiting a small but massive black hole.
• D) negatively charged electrons and positively charged protons mixed uniformly throughout the volume of the atom.

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Definitions:

Hox Gene Clusters

Groups of genes that control the body plan of an embryo along the head-tail axis by dictating the positions of various anatomical structures.

Anterior-Posterior Axis

A directional axis in biology, referring to the front (anterior) and back (posterior) orientation of an organism or its parts.

Ray-Finned Fishes

A class (Actinopterygii) of modern bony fishes; contains about 95% of living fish species.

Tetrapods

A vertebrate group that includes all species with four limbs, such as amphibians, reptiles, birds, and mammals, including those that have lost limbs through evolution.