The process by which certain white blood cells can engulf disease-causing organisms and digest them is ________
Fill in the blank(s) with correct word
phagocytosis
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Scientists hypothesize that the massive Permian extinction was triggered by ____
a. asteroid impacts that caused atmospheric dust clouds b. a series of ongoing volcanic eruptions c. degradation of the environment by humans d. rising sea levels that covered most landmasses e. extreme global cooling that made Earth uninhabitable
Which molecule is believed to have preceded the other three during the evolution of life?
A. DNA B. ATP C. Proteins D. RNA
Santhi Soundarajan won a silver metal in the 2006
Pan Asian Games. Why did she later have her metals recalled? a. She was a cross-dresser who pretended to be female. b. She was a female who had a Y chromosome without knowing about the genetic condition. c. She used performance enhancing drugs that altered her genetic structure. d. She was genetically altered at birth to create a faster runner. e. Her government gave her a sex change in order to hide the fact that she was really a male.
Which of the following statements is FALSE concerning bacteria?
A. They are prokaryotic. B. They can form endospores under unfavorable conditions. C. They contain complex organelles composed of membranes. D. They can be autotrophic or heterotrophic.