Microtubules function in cells
A. as structural supports, maintaining the shape of the cell
B. participate in cell division
C. as a part of the system that causes movement in cilia and flagella
D. all of the above
查看答案
Proteins are polymers of
A. amino acids
B. carbohydrates
C. nucleic acids
D. lipids
Which organelle contains DNA?
A. lysosome
B. mitochondrion
C. Golgi body
D. ER
Which one of the following matches is INCORRECT? ()
A. Golgi apparatus -protein synthesis
B. peroxisome -fatty acid breakdown
C. nuclear pores -RNA transport
D. lysosome -digestion of macromolecules
A eukaryotic cell that receives a “go-ahead” signal at the G1 checkpoint of the cell cycle will ()
A. enter a resting stage
B. move directly into the M phase
C. move directly into the G2 phase
D. complete the cycle and divide
微信支付 
支付宝支付