Select all below is a reason that organisms need to maintain a stable pH. -pH levels affects the amount of energy produced
-pH levels can affect the amount of water a living thing can take in
-pH levels can determine the type of reactions that take place in a living
organism
-pH levels can affect the rate of reactions
-pH levels can impact cell growth and development

You have just sequenced a new protein found in mice and observe that sulfur-containing cysteine residues occur at regular intervals. what is the significance of this finding? it will be important to include cysteine in the diet of the mice. cysteine residues are required for the formation of α helices and β pleated sheets. cysteine residues are involved in disulfide bridges that form tertiary structure. cysteine causes bends, or angles, to occur in the tertiary structure of proteins.

The cretaceous period spanned the time interval between and 65 million years ago. 250 million 144 million 75 million 200 million

Which statement describes how favorable traits in a population relate to natural selection? they are the only traits that ever exist in the population. they build in the population over time. they are rarely passed on to offspring. they are found only in a few individuals within the population.