What is the role of the guide RNA (gRNA) in CRISPR? 1. the gRNA opens the nucleus of a cell and allows the CRISPR CAS9 system into the nucleus.

2. the gRNA focuses the CRISPR CAS9 system on the specific sequence that needs to be cut.

3. the gRNA guides the CAS9 enzyme to the ends of the DNA molecule and lines up the appropriate bases.

4. the gRNA sequence is attached to the ends of introns so they can be removed by the CRISPR CAS9 system.

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.

In the human body fibrinogen is necessary for sealing cuts and stopping the loss of blood. since fibrinogen is made of chains of amino acids it is an example of which type of organic molecule

What maintain homeostasis when a persons internal body temperature is 97.5°f