â Must-know
đ Prokaryotic cells lack DNA organized in a nucleus, whereas eukaryotic cells have DNA organized into chromosomes within a nuclear membrane.
đ A system consists of organs made from the same type of tissue that perform related physiological actions, whereas an apparatus consists of body parts, tissues, and organs working together for a specific function.
Further detail
1. Which substance makes up the largest listed proportion of a human cell?
2. What distinguishes the organization of DNA in eukaryotic cells from that in prokaryotic cells?
3. In the levels of body organization, what is a tissue?
What proportions of a human cell are water, proteins, lipids, sugars, RNA, and salts?
75% water, 15% proteins, 3% lipids, 2% sugars, 2% RNA, and 1% salts.
How is DNA organized in prokaryotic cells compared with eukaryotic cells?
Prokaryotes lack DNA organized in a nucleus; eukaryotes have chromosomes within a nuclear membrane.
What is a tissue?
A group of cells with a common origin.
What distinguishes a system from an apparatus in body organization?
A system has organs made from the same tissue type performing related actions; an apparatus combines body parts, tissues, and organs for a specific function.
Which cavities make up the dorsal cavity?
The cranial and spinal cavities.
Where is the thoracic cavity, and which organs does it contain?
Above the diaphragm; it contains the lungs, heart, trachea, and major blood vessels.
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