Which of the following statements apply to freshwater fish?
A) They lose water by osmosis.
B) The concentration of solutes in their internal fluids is lower than in the surrounding water.
C) They pump out ions via the gills.
D) They produce dilute urine.
D
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An example of an animal with a long digestive tract and molars with large, ridged surfaces is a ____
a. cat b. deer c. dog d. shark e. tiger
Recent fossil discoveries may represent the earliest animal species ever found. How old are they?
a. 430 million years old b. 25 million years old c. 650 million years old d. 5 billion years old
Briefly discuss the complementary functional roles of insulin and glucagon What will be an ideal response?
Most molecular biologists think that viruses originated from fragments of cellular nucleic acid. Which of the following observations supports this theory?
a) Viruses can reproduce only inside host cells. b) Viruses can infect both prokaryotic and eukaryotic cells. c) Viral genomes are usually similar to the genome of the host cell. d) Viruses contain either DNA or RNA. e) Viruses are enclosed in protein capsids rather than plasma membranes.