Q1. Synaptic signalling between adjacent neurons is like hormone signalling in which of the next ways? A) It sends its signal molecules through blood. B) It sends its signal molecules quite the distance. C) It needs calcium ions. D) It requires binding of a signalling molecule to a receptor. E) […]

1. What was the general attitude of the people and the government of the US during the 1800’s towards nature? What specific acts were put in place to exemplify this attitude? What is the manifest destiny? 2. Why did the Railroad companies to hire artists? What were these artists trying to convey […]

Q1. If relatively small carbonaceous chondrites from space were a significant source of Earth’s original amino acids, then which two of these would have been most important in permitting their organic materials to survive impact with Earth? I. Carbonaceous chondrites must contain no D-amino acids. II. Earth’s early atmosphere must […]

1- Assume if you isolate a single nucleotide from a nucleic acid chain and determine that the nitrogenous ring structure is cytosine, you could say with certainty that the nucleotide could have come from: – DNA but not RNA.– RNA but not DNA.– either DNA or RNA.– neither DNA nor […]