Plant and animal cells differ in a variety of ways. notice when you compare the model cells, plant cells contain chloroplasts and animal cells do not. what is the function of this organelle found in plant cells?
a) it is the site of photosynthesis, where glucose is produced.
b) it is the site of cellular respiration, where cellular energy is produced.
c) it is the site of cellular digestion; glucose is broken down to produce energy.
d) it is the site of protein synthesis; amino acids are joined together to make proteins.

In which case would a scientist choose to use a dissecting microscope rather than a compound microscope

Which of these substances does not protect against invaders in the nonspecific immune response? a. saliva b. mucus c. tears d. urine

Astudy by solloch and et. al., in 2017, gives the map above which shows the frequency of alleles with a ccr5-delta32 mutations over 87 different countries. this mutation deletes the presence of a co-receptor (ccr5) on the outside of human t-cells (lymphocytes). some viruses, such as the one responsible for the black death and human immunodeficiency virus (hiv), require this receptor for attachment to host cells during the infection process. the black death was an epidemic that passed over northern europe during the 14th century killing nearly 60% of europeans. according to this information, which explanation best explains why northern europeans show a greater immunity for hiv than some other parts of the world?