A needle can be made to "float" on the surface tension of water. What causes this surface tension to form?
A) The adhesion of water molecules to the needle
B) The cohesion of water molecules to each other
C) The solubility of water
D) The heat capacity of water
B
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When a chemotherapeutic agent is effective against many different pathogens, it is said to be a ________ antibiotic.
Fill in the blank(s) with the appropriate word(s).
Which of the following carbohydrates is made by plants and is not digested by humans?
A) lactose B) starch C) cellulose D) glycogen
A biologist uses a time machine to collect living material from 2 different time periods. Sample A is 3 billion years old and sample B is 1.5 billion years old. How would these samples differ?
A. Eukaryotic organisms would be absent from sample A. B. Eukaryotic organisms would be present in both samples but much more common in sample B. C. Prokaryotic organisms would be abundant in sample A but absent from sample B. D. Prokaryotic organisms would only occur in sample B.
As you are walking along a beach, you find an animal and believe that it belongs to the class Asteroidea. Which of the following characteristics would support your hypothesis that the animal is a sea star and not another type of echinoderm?
A) It is pentaradially symmetric. B) It feeds on other animals. C) It has a hydrostatic skeleton, formed from its water vascular system. D) Its central region is not well-delineated from its appendages.