Describe the four requirements for chemical evolution and why each was essential. What will be an ideal response?
Concepts to Consider: Little or no free oxygen; a source of energy; chemical building
blocks including water, dissolved inorganic minerals, and gases; plenty of time.
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Answer the following statements true (T) or false (F)
1. Cephalopods have a ring structure in their skin that secretes mucus to bind mating individuals and forms a protective cocoon for their eggs. 2. Echinoderms have centralized nervous control at the center of their bodies. 3. Monotremes are classified as reptiles because they lay leathery eggs. 4. Male monotremes and eutherians possess mammary glands. 5. Mastication is a kind of physical digestion.
Where does the ovule meet the sperm that fertilizes it?
A. In the uterus B. In the oviduct C. In the ovary D. In the vagina
If phospholipids form a spherical structure when placed in water, then which of the following is the most logical
conclusion about those phospholipid molecules? a. They form a bilayer. b. They are cone-shaped. c. They are not amphipathic. d. They have two hydrophilic ends. e. They contain two fatty acid chains
The strand of DNA that is not transcribed is called the ________ strand.
A. template B. coding C. noncoding D. complementary