IB Bio

Question 1

What does a light microscope do?

Answer 1

uses visible light to detect and magnify very small objects

Question 2

What does an electron microscope do?

Answer 2

uses a beam of accelerated electrons as a source of illumination

Question 3

define “naked” in relation to prokaryotic DNA

Answer 3

Naked DNA is not associated with proteins

Question 4

what is a micrograph?

Answer 4

a photo taken through a microscope to show a magnified image of an item

Question 5

what is the arrangement of a nucleoid in a prokaryotic cell?

Answer 5

The DNA is not enclosed in a membrane, it is found freely in the cytoplasm, DNA is in the formation of a single loop, and DNA is not wrapped around proteins

Question 6

what are ultrastructures?

Answer 6

cellular structures that are too small to be seen under a microscope. (such as prokaryotic cells)

Question 7

what are the characteristics of a prokaryotic cell

Answer 7

circular, one chromosome, naked, plasmids may be present, no intron sequences, found in nucleoid region, one DNA replication start point

Question 8

characteristics of a eukaryotic cell

Answer 8

Is linear, has many chromosomes, associated with histone proteins, no plasmids, intron sequences are present, it is contained in a membrane bound nucleus, and there are multiple origins of implication

Question 9

describe the arrangement of plasmid DNA in a prokaryotic cell

Answer 9

extra pieces of small circular DNA that can be shared between bacteria, often contains a gene for antibiotic resistance

Question 10

extracellular

Answer 10

anything outside the cellular membrane