Protein sequence A shows a string of leucines (hydrophobic amino acids) at one end and a string of arginine (hydrophilic amino acids) at the opposite end, whereas protein sequence B contains purely hydrophilic amino acids. It is known that both proteins are membrane proteins. Which of the following statements best classifies Protein A and Protein B?
a. Protein A is a surface protein; Protein B is a transmembrane protein.
b. Protein A is a transmembrane protein; Protein B is a peripheral membrane protein.
c. Protein A is a transmembrane protein; Protein B is also a transmembrane protein.
d. Protein A is a transmembrane protein; Protein B is a peripheral membrane protein that can only be situated on the outer side of the membrane.
e. Protein A is a transmembrane protein; Protein B is a peripheral membrane protein that can only be situated on the inner side of the membrane.

The construction of phylogenetic trees is a mapping out the proposed divisions and common ancestors of all living species. traditionally, these trees have been built using morphological data, such as appearance and embryology. recently, it has been possible to construct these trees using molecular data. phylogenetic trees based on different types of information agree with each: that there is strong evidence of a real underlying common descent. this phylogenic tree is composed based on molecular data (rrna). what statements can we infer are true about the organisms throughout the tree? because the tree is rooted, all branches share a common ancestor. all organisms have some sort of cellular structure/organization. all eukaryotes evolved from bacteria. since the organisms contain rna, they share the same dna. if the organisms contain rna, the share the same four nitrogen bases.

Ascientist separates a population of mice into two groups. what would most likely increase the rate of speciation in this population. a. teach the two groups different tricks b. allow the two groups to breed with each other c. put the two groups in different environment d. have the two groups live in identical ecosystems

Suppose you use three different scale to weigh a bag of organges. one scale says the nag weighs 2.1 lb, and third says it weighs 2.1 lb. the actual weight of the bag of organges is 2.153 lb. which of the following best decribes these results?