Which group of angiosperms includes grasses and lilies?
a. Monocots
b. Dicots
c. Basal angiosperms
d. Eudicots
a. Monocots
Monocots are the angiosperms that include grasses and lilies, as well as orchids and palms.
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Which statement about the fate of progenitor cells in Caenorhabditis elegans is not correct?
A. The fate of progenitor cells is determined by their proximity to the anchor cell, which secretes epidermal growth factor. B. Epidermal growth factor binds and activates a transmembrane receptor protein in the cell nearest to the anchor cell. C. In the cell closest to the anchor cell, genes for differentiation into a type 1 cell are activated by epidermal growth factor binding to its receptor. D. Following epidermal growth factor receptor activation, the cell closest to anchor cell inhibits adjacent cells from differentiating to type 1 cells. E. Differentiating into a type 2 cell occurs spontaneously without the need for special genes for type 2 differentiation.
Which repair mechanism often leads to deletions in chromosomes?
A. Recombinational repair B. Direct repair C. Base excision repair D. Mismatch repair E. Nucleotide excision repair F. Nonhomologous end joining (NHEJ)
Answer the following statements true (T) or false (F)
1. Viruses are the smallest infectious agents. 2. Rickettsia spp. and Chlamydia spp. cannot be grown on artificial media. 3. Prions are infectious RNA molecules. 4. HIV is an enveloped, double-stranded RNA virus. 5. Organisms in the genus Vibrio are curved bacilli.
The cells that function with the sieve tubes are the
a. vessel members. b. companion cells. c. adjunct cells. d. sclereids. e. periderm.