Câu 1. Ở một loài động vật có 2n = 4. Một tế bào đang ở kì đầu của nguyên phân. Tế bào đó có bao nhiêu NST kép trong các trường hợp sau đây? A 2
B 8
C 4
D 6

Identify two examples of chemical reactions that you have encountered during the last week. identify an exothermic and endothermic reaction. explain.

Molecules like glucose and amino acids are not lipid soluble, so cannot cross the cell membrane by simple diffusion. instead, they are shuttled across by carrier proteins in the membrane from high to low concentration. does this process require energy from the cell? this is an example of what type of molecular movement?

What is the role of rna polymerase? it creates the dna strand its the dna strand. it transcribe the dna strand il translates the dna strand save and exit next sube mark this and retum