Thylakoids exist in stacks inside the thylakoid lumen. What is the term for these stacks?
a. chloroplast
b. stroma
c. granum
d. mesophyll
c. granum
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Which one of the following statements about the trypanosome causing African sleeping sickness does not explain why the disease has been difficult to control?
A. Trypanosomes have a protective glycoprotein coat. B. Trypanosomes have many variable antigen genes. C. Rearrangement of antigen genes takes place during the asexual cycle. D. By infesting the red blood cells, trypanosomes can "hide" from the immune system. E. Only one gene determining the antigenic nature of the glycoprotein coat is expressed at a time.
A fragment of DNA or RNA, labeled with a tracer, used for genetic studies is called a ________
a. probe b. genome c. cloning vector d. chromosome e. nucleotide
The mass extinction at the end of the Cretaceous period:a
occurred about 250 million years ago. b. had little impact on gymnosperms. c. was likely the result of dramatic climate changes. d. was followed by the period dominated by reptiles and dinosaurs. e. was caused by the global distribution of iridium and the subsequent radioactive fallout.
Starch is a long chain of sugars commonly found in foods such as corn, grain, potatoes, peas, and beans.
a. true b. false