Protozoa are single-celled eukaryotic organisms. Many aquatic animals feed on protozoa. Protozoa help control the population of bacteria as well as other protozoans by feeding on them. Controlling the population of other organisms is important in maintaining ecological balance and diversity.
Answer:I
Daniel Boone (1734–1820) and Davy Crockett (1786–1836) became two real-life icons of pioneer history.
Explanation:
The answer is guard cells. They're the cells that controls the opening and closing of stomata, the stomata opens during day time and closes during night, it is because day time has sunlight which is necessary to photosynthesis and water and oxygen can be released. The guard cells are like a door, that opens and closes.
Answer:
The mRNA for an Alzheimer-related gene is 2400 nucleotides long when isolated from neurons, but 2900 nucleotides long when isolated from glial cells. Genomic DNA isolated from the two cell types show the identical nucleotide sequence. the mechanisms that best accounts for the difference in the sizes of the mRNAs is the alternative slicing mechanism.
Explanation:
A controlled process during gene expression that results in a single gene coding for multiple proteins is referred to as alternative splicing.
During this process, particular exons of a gene may be included within or excluded from the final, processed messenger RNA (mRNA) produced from that gene.
Thus, the mechanisms that best accounts for the difference in the sizes of the mRNAs is the alternative slicing mechanism.
