The fluid-filled space inside a chloroplast is called the
a. stroma.
b. granum.
c. matrix.
d. thylakoid.
Ans: a. stroma.
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Why have so few primates gone extinct compared to other species, such as mussels or birds?
a. Primates have large brains. b. Primates are not killed for food or other human uses. c. Primates live in stable environments. d. Primates are among the most closely monitored and protected species. e. Primates are highly mobile.
Which respiratory disease is caused when bacterial enzymes destroy the alveolar walls and the surface area of the lungs declines?
a. Emphysema b. Tuberculosis c. Asthma d. Apnea e. Pneumonia
The 3' end of DNA or RNA ends with a phosphate group. Indicate whether the statement is true or false
Some scientists propose that the kingdom Protista should be broken up into several kingdoms. Which of these statements accurately supports this idea?
a. Protists are all very similar and easy to confuse b. Protista contains very diverse organisms that do not fit into the other kingdoms c. Protists are the most numerous organism on Earth d. Protista evolved before any other kingdoms