DNA replication stress 是什么意思? 翻译过来是DNA复制压力吗? 求知道的大大详细解释下

1.Which of the following statements about DNA replication in eukaryotes is not
correct?
a.It is bidirectional
b.It takes place from a single unique origin of replication
c.It is slower than in prokaryotes
d.It takes place in S phase of the cell cycle
2.Bacterial DNA is usually:
a.Single stranded
b.Circular
c.Complexed with histones
d.Shorter in length than a bacterial cell
3.Which of the following is not correctly matched to one of its functions?
a.Ribosome - protein storage
b.Mitochondrion – generation of ATP
c.Golgi complex – protein sorting
d.Lysosomes - digestion of cellular material
4.Cells which harness light energy and convert it to chemical energy are referred to
as:
a.phototrophs
b.lithotrophs
c.eukaryotes
d.chemotrophs
5.The major site for synthesis of secretory proteins is:
a.the nucleus
b.the plasma membrane
c.the rough endoplasmic reticulum
d.the smooth endoplasmic reticulum
6.Which of the following techniques is the best one to use to study the three
dimensional structure of organelles?
a.scanning electron microscopy
b.transmission electron microscopy
c.phase contrast microscopy
d.fluorescence microscopy
7.Prokaryotic cells:
a.contain no DNA
b.are always anaerobic
c.do not show endocytosis or exocytosis
d.contain 80S ribosomes which are inhibited by cycloheximide