Pigment is contained in an eyespot or ________ that helps certain organisms orient to light.
Fill in the blank(s) with the appropriate word(s).
stigma
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Refer to the paragraphs on the Krings et al. paper. How could the "demographic history of Neanderthal populations" be explored if mitochondrial DNA from other Neanderthal samples could be PCR amplified?
A) These Neanderthal sequences could be compared to those of modern humans to learn how modern humans evolved to walk on two legs (bipedalism). B) These Neanderthal sequences could be compared to those of modern humans; the more they differ, the more distant the time of divergence between the Neanderthal and modern human lineages. C) These Neanderthal sequences could be compared to each other to see how much they differ; the more they differ, the greater the divergence between these populations. D) In the attempt to amplify other Neanderthal DNAs, those that amplify must be from more modern populations and those that don't are from more ancient populations.
Answer the following statements true (T) or false (F)
1. One common feature with G-protein coupled, enzyme-linked, and growth factor receptors is that their activation leads to activation of protein kinases. 2. Cyclic AMP activates protein kinase C in producing a cell response. 3. If IP3 binds a Ca2+ ligand-gated ion channel in the endoplasmic reticulum, then cytosolic Ca2+ levels will rise in the cell. 4. If epinephrine increases glycogen metabolism in muscle cells, it would have the same function in brain cells.
A neurologist diagnoses a patient with damage to the hippocampus. This observation is consistent with the difficulties the patient reports with
A. forming memories of recent events. B. effectively coordinating movements once initiated. C. planning movements. D. maintaining a steady and regular heartbeat. E. perceiving tactile stimulation from different regions of their body.
Bacteria that undergo natural transformation ____
a. are very common b. are strains of E. coli c. are subjected to electroporation to induce DNA uptake d. generally have a DNA-binding protein on the exterior of their cell wall e. integrate foreign DNA into their chromosome through conjugation