Biology 1107 Unit 2
You are looking at a sample under a light microscope and observe a new
type of cell. You come to the conclusion that it is a bacterium and not a
eukaryotic cell. What would you observe to come to this conclusion? -
ANS -The cell does not have a nucleus.
Based on what you know about plant and animals cells, which of the
following events are most likely to have occurred? - ANS -A host cell
that gave rise to modern plants ingested both aerobic and
photoautotrophic bacteria, while a host cell that gave rise to modern
animals ingested aerobic bacteria only.
Macrophages ingest and digest many pathogens. Which organelle plays
a major role in the activity of macrophages? - ANS -lysosome
Inhibitors of microtubule assembly, vinblastine for example, are used
for cancer chemotherapy. How does an inhibitor of microtubule
assembly affect cancerous cells? - ANS -The inhibitors restrict the
separation of chromosomes, thereby stopping cell division.
, You have been identifying the sequence of a segment of a protein. The
sequence to date is: leucine-methionine-tyrosine-alanine-glutamine-
lysine-glutamate. You insert arginine between the leucine and
methionine. What effect would this have on the segment? - ANS -
Inserting arginine places a positively charged amino acid in a portion
that is non-polar, creating the possibility of a hydrogen bond in this
area.
Which of the following bodily process would most likely be hindered by
a lack of water in the body? - ANS -digestion
In the context of cell biology, what do we mean by "form follows
function?" What are at least two examples of this concept? - ANS -The
form of the structure is dictated by its function. For example, the arms
of humans and the wings of bats serve different functions, and thus
their forms are adapted to those functions.
Explain why glucose cannot pass directly through the cell membrane. -
ANS -The plasma membrane is selectively permeable to polar
molecules, and a transport protein is required.
Why do phospholipids tend to spontaneously orient themselves into
something resembling a membrane? - ANS -Phospholipids are
amphipathic molecules. The polar head faces towards water and the
nonpolar fatty acid tails face towards other fatty acid tails.
You are looking at a sample under a light microscope and observe a new
type of cell. You come to the conclusion that it is a bacterium and not a
eukaryotic cell. What would you observe to come to this conclusion? -
ANS -The cell does not have a nucleus.
Based on what you know about plant and animals cells, which of the
following events are most likely to have occurred? - ANS -A host cell
that gave rise to modern plants ingested both aerobic and
photoautotrophic bacteria, while a host cell that gave rise to modern
animals ingested aerobic bacteria only.
Macrophages ingest and digest many pathogens. Which organelle plays
a major role in the activity of macrophages? - ANS -lysosome
Inhibitors of microtubule assembly, vinblastine for example, are used
for cancer chemotherapy. How does an inhibitor of microtubule
assembly affect cancerous cells? - ANS -The inhibitors restrict the
separation of chromosomes, thereby stopping cell division.
, You have been identifying the sequence of a segment of a protein. The
sequence to date is: leucine-methionine-tyrosine-alanine-glutamine-
lysine-glutamate. You insert arginine between the leucine and
methionine. What effect would this have on the segment? - ANS -
Inserting arginine places a positively charged amino acid in a portion
that is non-polar, creating the possibility of a hydrogen bond in this
area.
Which of the following bodily process would most likely be hindered by
a lack of water in the body? - ANS -digestion
In the context of cell biology, what do we mean by "form follows
function?" What are at least two examples of this concept? - ANS -The
form of the structure is dictated by its function. For example, the arms
of humans and the wings of bats serve different functions, and thus
their forms are adapted to those functions.
Explain why glucose cannot pass directly through the cell membrane. -
ANS -The plasma membrane is selectively permeable to polar
molecules, and a transport protein is required.
Why do phospholipids tend to spontaneously orient themselves into
something resembling a membrane? - ANS -Phospholipids are
amphipathic molecules. The polar head faces towards water and the
nonpolar fatty acid tails face towards other fatty acid tails.
