Given what you know about how the genetic material is expressed in eukaryotes, how do you think certain genes are expressed in certain cell types but not others (i. e. neuron genes expressed in neurons, but not in liver cells)?

Genes are expressed depending on the cell type, this biological process is known as cell differentiation.  

Explanation:

Within the nucleus, gene transcription is dependent on the interaction of promoter regions with specific transcription factors that activate gene expression. Moreover, epigenetic mechanisms such as DNA methylation or histone modifications also influence gene expression

b exhibiting favoritism toward the kikuyu people.

hey, i believe your answer would be d. sugar ribose and the base uracil. i believe this is the answer, because rna consists of sugar ribose, adenine, guanine, cytosine, and uracil.

your first option is incorrect, because that's dna. where it consists of sugar deoxyribose, adenine, guanine, cytosine and thymine.

your second option is also incorrect, this is because sugar deoxyribose is in dna, and uracil is in rna. these two do not make sense together.

your third option being incorrect, because sugar ribose is in rna, but not the base of thymine. rna consists of uracil, not thymine.

lastly your fourth option being correct! this answer is correct, because both sugar ribose, and the base uracil are in rna! ~

answer is d. sugar ribose and the base uracil.