Genes with promoters that are constitutively expressed and needed in all cells are called
a. universal factors.
b. silencers.
c. activators.
d. housekeeping genes.
e. enhancers.
Ans: d
Biology & Microbiology
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This type of cell has pits and pit plugs
a. xylem b. phloem c. parenchyma d. sclerenchyma e. collenchyma
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Which of the following statements is true?
a. Mosses have xylem b. Mosses have lignin. c. Mosses have true stems. d. Mosses have rhizoids. e. Mosses have independent sporophytes
Biology & Microbiology
When cells stop responding to normal controls over
growth and division they a. begin to form a tumor. b. produce a malignancy. c. start to die. d. kill surrounding cells. e. produce scar tissue.
Biology & Microbiology
The repeating units of muscle contraction are called myofibrils
____________________ Indicate whether the statement is true or false.
Biology & Microbiology