A number of mutations have been described in G proteins that have profound effects on their activity. For example, some mutations greatly increase the affinity of the G protein for GDP, making it very difficult for GDP to be exchanged for GTP. Other mutations prevent the hydrolysis of GTP to GDP. For each of the statements that describes a malfunction in cellular response, indicate the type of mutation that is responsible. ​ The MAP kinase pathway is continually activated, even in the absence of a signaling molecule. Which type of mutation could be responsible for this malfunction in cellular response?

Which of the statements applies to frameshift mutations?

Suppose that three critical amino acids in the active site of a specific enzyme are phenylalanine, methionine, and valine. Which of the characteristics would you predict the substrate to possess in order to bind the active site of this enzyme? Refer to the figure shown. ​ If you have trouble viewing the image, it depicts the following information Hydrophilic amino acids: (Acidic: Aspartic acid & glutamic acid), (Basic: lysine, arginine, histidine), (Polar: Asparagine, glutamine, serine, threonine) Hydrophobic amino acids: Alanine, Valine, Leucine, Isoleucine, Methionine, Phenylalanine, Tryptophan, Tyrosine Special amino acids: Glycine, Proline, Cysteine

The protein derived from a particular gene is different when it is found in a neuron than in a muscle cell. This is most likely due to

Questions 54-56 refer to the following scenario: You are doing an experiment on a new class of G protein–coupled receptor. You make several cell lines that each express the receptor, the corresponding G protein, and adenylyl cyclase. Each cell line has different mutations in these components. You decide to measure cyclic AMP (cAMP) in the cells of each cell line to understand the effect of each of these mutations. For each of the descriptions of the mutations, indicate whether the amount of cAMP in the cells will increase, decrease, or stay the same compared to cells with no mutations in the signaling pathway. ​ A mutation in the a subunit of the G protein prevents it from binding to adenylyl cyclase but not the receptor. The amount of cAMP in cells will:

One way of describing the biochemical reactions of cellular respiration is that the overall process represents the oxidation of substrate molecules to extract chemical potential energy. How does this compare to the overall process of photosynthesis?

Which answer is accurate with regards to the reaction in this diagram?

Based on what you know of ATP’s chemistry, which of the substances is most likely to have similar functions in energy-management processes?

In the 1988 presidential election, George H. W. Bush benefited from all of the following EXCEPT

Jimmy Carter faced a host of economic problems when he became president: stagnating wages, rising unemployment, inflation, and falling industrial productivity. From which previous president(s) did he inherit a large federal budget deficit?