Question

question 4 (1 point) ✓ saved
cyanobacteria
are also called green algae.
are bacteria with a gram - positive cell wall.
may occur in packets surrounded by a carbohydrate sheath.
contain chlorophyll in thylakoids.
question 5 (1 point) ✓ saved
eukaryotic cells have several structural attributes which separate them from prokaryotes. which of these attributes are found in eukaryotes, but not found in prokaryotes?
peptidoglycan walls, cell membrane, nucleoid
larger size, organelles, nuclear membrane
ribosomes, chromosomes, cytoplasm
enzymes, chromatin, dna
question 6 (1 point) ✓ saved
disease spread in poorer countries of the world is increased by
inadequate medical care.
lack of immunizations and antibiotics.
malnourishment.
all of the above.

Explanation:

• Question 4: Cyanobacteria are prokaryotes. Green algae are eukaryotes. Cyanobacteria have Gram - negative cell walls. They do contain chlorophyll in thylakoids, but the key correct statement is that they may occur in packets surrounded by a carbohydrate sheath.
• Question 5: Prokaryotes have peptidoglycan walls (in most bacteria), a nucleoid (no nuclear membrane), and smaller size. Both prokaryotes and eukaryotes have ribosomes, chromosomes (though different in structure), cytoplasm, enzymes, chromatin (in a sense for prokaryotes with DNA - protein complexes), and DNA. Eukaryotes have a larger size, organelles, and a nuclear membrane which prokaryotes lack.
• Question 6: In poorer countries, inadequate medical care means diseases are not treated promptly. Lack of immunizations leaves people more vulnerable to preventable diseases, and lack of antibiotics can make bacterial infections more deadly. Malnourishment weakens the immune system, making it easier for diseases to take hold. So all of these factors increase disease spread.

Answer:

• Question 4: may occur in packets surrounded by a carbohydrate sheath.
• Question 5: larger size, organelles, nuclear membrane.
• Question 6: all of the above.