Frieda is developing a computer model of mutations in human DNA. She plans for the model to incorporate one point mutation for every 10
million base pairs of DNA, which is a rate that is supported by her research. However, her advisor argues that mutations could occur 100 times
more frequently under certain circumstances.
Which could most likely cause the increase in mutation rate that the advisor describes?
A
mutagens in the environment, such as tobacco smoke and certain pesticides
B. human cells that have especially large amounts of DNA
C. the presence of transcription factors that control gene expression
D. the presence of epigenetic factors that affect gene expression
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Alichen is an organism that structurally appears to be a single organism. but a lichen is actually two different organisms—a fungus and green algae—living together as one organism. the fungal partner derives its nutrition from the photosynthesizing algae. how does a lichen differ in its photosynthetic activity from elysia chlorotica, the sea slug that’s considered to be a photosynthesizing animal? a. in lichens, the fungi photosynthesize on their own, while elysia chlorotica forms a relationship with a photosynthesizing plant. b. in lichens, the relationship with the algae lasts throughout the life cycle, but in elysia chlorotica, the relationship occurs only during the immature juvenile stage of the slug’s life cycle. c. lichens can photosynthesize only because of the living algal partner, while elysia chlorotica incorporates chloroplasts from algae into its cells. d. in lichens, the association between the fungi and algae is permanent, while elysia chlorotica associates with a photosynthesizing organism only when it requires food.

Which technically is nasa developing that will astronauts reach mars

Which of the following sex and generation combinations directly produces the pollen tube of angiosperms? a) male gametophyteb) female gametophytec) male sporophyted) female sporophyte