Category 1: Cell Structure and Function:
1. Prokaryotes are considered by the scientific community as the most ancient life-forms on Earth. Yet, these
primitive cells share many common characteristics with the more mod
...
Category 1: Cell Structure and Function:
1. Prokaryotes are considered by the scientific community as the most ancient life-forms on Earth. Yet, these
primitive cells share many common characteristics with the more modern eukaryotes. However, one significant
difference between these two cell types is that only eukaryotes contain
A. membrane-bound compartments to carry out specialized functions
B. a selectively-permeable cell membrane to maintain homeostasis
C. deoxyribonucleic acid to serve as a template to produce proteins
D. a rigid cell wall which provides structure and support
JustificationUse the information below to answer the following two questions.
Identical lengths of potato cores were cut and massed. One potato core was then placed in 100 ml of each of the
following solutions; 0M sucrose, 0.2M sucrose, 0.4M sucrose, 0.6M sucrose, 0.8M sucrose, and 1M sucrose. These
were left to equilibrate overnight after which the potato cores were then removed, patted dry, and massed again.
Data is recorded in the table below:
Solution Initial Mass Final Mass
0M sucrose 2.2 g 2.4 g
0.2M sucrose 2.4 g 2.4 g
0.4M sucrose 1.9 g 1.8 g
0.6M sucrose 2.0 g 1.8 g
0.8M sucrose 2.2 g 1.8 g
1M sucrose 2.3 g 1.8 g
2. What is the most likely cause of the potato core gaining mass when placed in the 0M sucrose solution?
A. Sucrose moved into the potato core from the solution.
B. Sucrose moved from a region of higher concentration to a region of lower concentration.
C. Water moved down its concentration gradient.
D. Water concentrations stayed the same inside and outside the potato core.
Justification3. The isotonic point in this potato core experiment is closest to
A. 0M sucrose because sucrose moved into the potato core causing it to gain mass
B. 0.2M sucrose because water didn’t move into or out of the potato core
C. 0.2M sucrose because equal amounts of water moved into and out of the potato core
D. 1M sucrose because the potato core lost the most mass due to water loss
Justification4. Viruses are considered non-living because they lack the machinery to reproduce on their own and must rely on
a cellular host cell to survive. Structures common to both cells and viruses include
A. protein capsid
B. nucleic acids
C. cell wall
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