A parasite such as a tapeworm can be picked up from eating undercooked meat. Symptoms
often include nausea and stomach cramps. This is an example of __________.
a. a disease
b. an infection
c. both a disease and an infection
C
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Why did scientists originally believe that proteins, rather than DNA, were the molecules that directed protein synthesis?
A. Proteins were the more complex molecules in which genetic information could be stored. B. Proteins were more likely to have catalytic properties for synthesis reactions. C. At the time, more was known about the structure of proteins than that of DNA. D. Proteins were the same types of molecules as those that were being synthesized.
The host range of a virus depends on the presence of host receptor molecules
Indicate whether this statement is true or false.
The majority of mammal species living today are ____, or placental mammals, including such diverse
groups as rodents, bats, whales, and primates.
a. protherians b. therapsids c. anthropoids d. eutherians e. metatherians
_____ is the transmission of DNA to offspring
a. Reproduction c. Homeostasis b. Development d. Inheritance