What adaptations did ancient algae have to achieve as they washed ashore and evolved into the more advanced land plants we see today?
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Algae achieved these adaptations: anchorage with roots; cuticle to prevent drying out; vascular tissue to move water long distances; producing gametes within structures so that they didn't dry out; development of pollen, eliminating the need for sperm to swim through free-standing water to reach the egg.
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A student poses the question: How does the presence of dissolved salt affect the freezing point of water? To answer this question, the student set up two conditions. In the first condition, the student added salt to water in a container and referred to this condition as the variable. In the second condition, the student did not add any salt to water in a second container and referred to this
condition as the control. The student took both containers and attempted to freeze the water at various temperatures to assess the freezing point. Would this be a valid experiment? A. Yes, because there is more than one variable. B. Yes, because there is one variable and a control C. No, because there is not more than one variable D. No because there is only one variable and a control
How do eukaryotic transcription factors exert their effects on transcription when their binding sites can be thousands of base pairs away from the promoter?
A. Regulatory proteins bind the sequences and then slide along the DNA until they reach an RNA polymerase bound to a promoter. B. After binding to the site, the regulatory protein releases the DNA and is targeted to the polymerase via coactivator proteins. C. Once bound to the site, the regulatory protein catalyzes the formation of an effector molecule that then travels to and binds the polymerase. D. The DNA between the bound site and the polymerase-promoter complex loops out, increasing proximity.
Why do florists and horticulturists often cut stems while they're holding a plant underwater?
A) to avoid transpiration B) to prevent dormancy C) to disrupt apical dominance D) to avoid formation of an embolism
Characteristics of all the members of the family Enterobacteriaceae include
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