Which cells form a type of vascular tissue by joining end to end in tubelike columns, develop thick, lignified cell walls, and die at maturity, thus leaving an open-ended, water-conducting tube?
a. tracheids
b. vessel members
c. parenchyma cells
d. collenchyma cells
Ans: b. vessel members
Biology & Microbiology
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During prophase I of meiosis, each chromosome consists of ____
a. one single-stranded DNA molecule b. two sister chromatids c. one sister chromatid d. four sister chromatids e. one double-stranded DNA molecule
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Which of the following contains single-stranded DNA as its genetic material?
A) humans B) E. coli C) HIV D) ?X174
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If a set of genes is repressed in the presence of the controlling substance, it is referred to as ________ control.
Fill in the blank(s) with the appropriate word(s).
Biology & Microbiology
Some species of cyanobacteria can fix atmospheric nitrogen.
Answer the following statement true (T) or false (F)
Biology & Microbiology