Which of the following macromolecules is matched with its correct role in the cell? Choose ONE

A. Carbohydrates — key component of the cell membrane (lipid bilayer)

B. Lipid — chemical messenger

C. Lipid — storage of short-term energy

D. Nucleic acid — chemical messenger

Living cells cannot use heat to provide the activation energy for biochemical reactions because which choice(s) complete the sentence correctly? a) answer choice ii. eliminate b) answer choices ii and iv. c) answer choice iii and iv. d) all answers can complete the sentence.

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?

Anormal strand of dna is shown below, followed by the same strand of dna after mutations have occurred.