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Flashcards in Lab 2 Deck (13)
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1
Q

Define resolution:

A

the ability to distinguish objects that are close together.

2
Q

What is contrast?

A

determines resolution by providing different optical intensities of the sample relative to its background.

3
Q

Define refraction:

A

When light bends as it passes through glass.

4
Q

Define interphase:

A

the portion of the cell cycle that occurs between division events.

5
Q

What are the 4 stages of mitosis?

A
  1. prophase
  2. metaphase
  3. anaphase
  4. telophase
6
Q

What happens during prophase?

A

The nuclear membrane dissolves and the DNA condenses from loose coils into tight coils with identical chromatids joined at the centromere.

7
Q

What is a chromatid?

A

One of the two identical copies of DNA making up a duplicated chromosome.

8
Q

What happens during metaphase?

A

The chromosomes attach at their centromeres to the microtubules of the mitotic spindle and are positioned mid-planar within the cell.

9
Q

What is the spindle?

A

A network of protein filaments that are attached at opposite poles of the cell, which moves and positions chromatids.

10
Q

What is the centromere?

A

The region of DNA that occurs typically near the middle of a chromosome where the two identical sister chromatids come closest in contact.

11
Q

What happens during anaphase?

A

The sister chromatids are separated and moved to the opposite poles of the cell.

12
Q

What happens during telophase?

A

The nuclear envelope reforms, the chromatin reappears in the nucleoli as the DNA uncoils and is compacted with histones and other proteins.

13
Q

What happens after telophase?

A

cytokinesis