Question

monday september 8th
a group of students studied four different cell specimens under a microscope and recorded information about their cell...
characteristics of four cell specimens

cell specimen	cell wall	cell membrane	chromosomes	dna in nucleus
cell 2	no	yes	no	yes
cell 3	yes	yes	no	no
cell 4	no	yes	no	yes

which cell specimen is a prokaryote?
(a) cell 1
(b) cell 2
(c) cell 3
(d) cell 4

the presence of which structure helps classify an organism as eul...?
(a) nucleus
(b) cell wall
(c) flagellum
(d) chromosome

Explanation:

First Question (Which cell specimen is a prokaryote?):

Prokaryotes lack a nucleus (no chromosomes in a nucleus, i.e., "DNA in Nucleus" is No) and have a cell wall (usually) and cell membrane. Let's analyze each cell:

• Cell 1: DNA in Nucleus is Yes (eukaryote feature), so not prokaryote.
• Cell 2: DNA in Nucleus is Yes (eukaryote feature), so not prokaryote.
• Cell 3: DNA in Nucleus is No (prokaryote feature), has cell wall and cell membrane, no chromosomes in nucleus—matches prokaryote.
• Cell 4: DNA in Nucleus is Yes (eukaryote feature), so not prokaryote.

Eukaryotic cells are defined by having a nucleus (where DNA is in chromosomes within the nucleus). Prokaryotes lack a nucleus. Cell wall (B) is present in some prokaryotes (bacteria) and eukaryotes (plants/fungi). Flagellum (C) is present in some prokaryotes and eukaryotes. Chromosomes (D) are present in both (prokaryotes have circular chromosomes in cytoplasm, eukaryotes in nucleus). Only nucleus (A) is unique to eukaryotes for classification.

Answer:

C. Cell 3

Second Question (The presence of which structure helps classify an organism as eukaryotic?):