The pincer-liek structures on the aboral surface of a sea star are called papulae
a. true
b. false
Answer: b. false
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Scientists supporting phyletic gradualism explain any period of stasis in the fossil record as stabilizing
selection. ___________ Indicate whether the statement is true or false.
Some viruses have a membranelike structure on their surface, composed of lipids, proteins, and carbohydrates. This is called a(n) __________.
A. envelope B. capsid C. capsule D. core
You have a cup of vegetable oil and a vial full of normal phospholipids. What would you predict would happen if you dropped the phospholipids into the cup of vegetable oil?
A) The phospholipids would form a sphere with the heads on the inside. B) The phospholipids would form a sphere with the tails on the inside. C) The phospholipids would float on the surface of the oil with the tails in the air. D) The phospholipids would float on the surface of the oil with the heads in the air.
Which of the following groups represents the basal lineage(s) of vertebrates?
a. Lancelets b. Tunicates c. Hagfish and lampreys d. Sharks and rays e. Coelacanths