Answer:
1. A natural killer cell identifies unusual cells, combines with them, and discharges perforin and molecules of granzyme that stimulates apoptosis.
2. A basophil comprises huge concentrations of histamine in granules, gets stain with basic dye methylene blue, and helps in inflammation and allergic reactions.
3. A macrophage refers to a huge agranular phagocyte, which is found within the tissues like lungs and brain.
4. An eosinophil comprises histamine and major basic protein in granules gets stain with acidic dye eosin and helps in reactions against the helminths and protozoa.
The natural killer cell recognizes and destroys abnormal cells, the basophil facilitates allergic responses and inflammation, the macrophage is a large cell that resides in tissues, and the eosinophil facilitates responses to certain parasites.
Here is the correct match for each cell type with its description:
#SPJ3
O Cell membranes with ester-linked fatty acids are found in both Archaea and Eukaryota but not in Bacteria.
The composition of cell walls is similar in Archaea and Eukaryota but not in Bacteria.
The single-celled prokaryotic cells of Archaea and Eukaryota are visually similar, but Bacteria is not.
SQUASH
5 POINTS
80 POINTS
SEEDS
80 POINTS
Answer: Pumpkin
Explanation:
Cucumbers have a lot of seeds but are not squash.
Apples are neither squash nor do they have that many seeds.
Pumpkins are squash and have a lot of seeds so this must be the correct answer.
Melons have a lot of seeds but are not considered squash even though they are related.
B. Red headed females in a population will only breed with red headed males. The yellow headed females will only breed with yellow headed males. The red and yellow populations live on separate continents and rarely met in nature. The red and yellow could breed and produce fertile offspring but they normally do not. This would be an example of sympatric speciation.
C. Sympatric speciation does not require geographic isolation.
D. Red headed females in a population will only breed with red headed males. The yellow headed females will only breed with yellow headed males. This population lives in the same geographic area. The red and yellow individuals could breed and produce fertile offspring but they normally do not. This would be an example of sympatric speciation.
E. Sympatric speciation can be due to sexual(mate) selection
Answer: Options A, C and E are correct
A) Sympatric speciation is best described as a random event that disrupts the allele frequencies in a population
C) Sympatric speciation does not require geographic isolation.
E) Sympatric speciation can be due to sexual(mate) selection
Explanation:
Sympatric speciation is the situation whereby organisms of the same species:
- live in the same territory or nearby territories ( i.e not living in isolation)
- DO NOT interbreed, but select a sexual mate from a much diverse territory which results in an uneven gene flow or disruption of alleles in new species or offsprings of such parents organisms.
OB. The bamboo population decreases so low that the carrying capacity for pandas becomes zero.
O C. The populations of bamboo and pandas follow a cyclical pattern of increasing and decreasing, until one of them becomes extinct
O D. The populations of bamboo and pandas both follw a pattern of exponential growth, and then both become extinct
Answer:
B
The bamboo population decreases so low that the carrying capacity for pandas becomes zero.
Answer:
I think it would be C
Explanation:
The populations of bamboo and pandas depend on each other