1. which part of the microscope provides concentration of light coming out of a light source? a. oculars
b. objective
c. condenser
d. light bulbs on/off switch
e. none of the above

2. what is the total magnification of the cells when using the immersion objective of bright field microscope?
a. 40
b. 10
c. 100
d. 400
e. none of the above

3. the role of the immersion oil is to___
a. prevent the loss of light by refraction
b. make objective gentle touching a slide
c. magnify 1000x
d. concentrate light coming from the bulb
e. none of the above

1. C. Condenser

2. C. 100

3. d. concentrate light coming from the bulb

Explanation:

The Condenser is the part of a microscope that helps to condense the light rays thereby making the visuals clearer and more efficient. This is possible by the increase in concentration of the rays .

The total magnification of the cells when using the immersion objective of bright field microscope is 100x.

The role of the immersion oil is to concentrate light coming out from the bulb

you are certainly talking about this picture:

a: is the label of the white square, it is showing the  replication fork, formed by helicase (d) ==> so it is the site of dna separation and replication 

b: is a new dna brand that is following directly the replication fork, so it is continuous ==> built continuously from 5' to 3

c: dna polymerase cannot replicate dna on its own, it needs the of their proteins, and one of them plays the role of a clamp which fixes  the dna with the dna template and increases  the processivity of the enzyme. ==>   stops polymerase from falling off the  template.

d: is the enzyme responsible for forming the replication fork (helicase) ==> unwinds and separates dna into two strands

e: is the delayed strand, it is built  in the opposite sense of the helicase, so dna will be built in fragments ==> built  fragments from 5' to 3 joins

and finally f: is the enzyme that builds  the new dna strand (dna polymerase) ==>   adds nucleotides to make a new dna helix.

credit: gradman555p98x9p

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i think it is true in my reasonment ..