Tutor profile: Kishan P.
Subject: SAT II Biology E/M
Which of the following choices include cells that have both a cell wall and a membrane? I. Bacterial cells II. Fungal cells III. Animal cells
Only bacterial cell and fungal cells have cell wall and a membrane. Remember that animal cells only have a cellular membrane.
Subject: Biomedical Science
What is a positive feedback system and give an example.
A positive feedback system is when the systems creates a larger response based on receiving feedback from itself. Think about a women undergoing labor. Once her contractions start, the hormone oxytocin is released. This hormone causes more contractions to be created which results in more oxytocin being produced and the cycle repeats itself.
What are the nucleotide base pair that make up DNA, and how does this differ in RNA?
All DNA and RNA is made up of 4 nucleotide base pairs. DNA and RNA differ by one nucleotide base pair. Adenine, Guanine, Cytosine, and Thymine can be found in DNA. Adenine, Guanine, Cytosine, and Uracil can be found in RNA. Don't forget that Guanine and Cytosine bind together while Adenine and Thymine bind together in DNA. In RNA, Guanine and Cytosine bind together while Adenine and Uracil bind together