An allergic response is NOT typically caused by

A. Harmless antigens

B. Pollen

C. Histamine

D. Both A and C

I'm conflicted because histamine causes the physical response but pollen and harmless antigens cause histamine

Secondary active transportA) does not require the cell to invest energy, either directly or indirectly. B) is not carried out by membrane proteins. C) does not link the pumping of one substance to the concentration gradient of another.

These are all living organisms on earth

Which cell structure functions to store genetic information that provides instructions for a eukaryotic cell? Select one: A. nucleus B. cytoplasm C. mitochondria D. cell membrane

Example of variation

Does a cell use energy when molecules diffuse in or out of the cell down the concentration gradient

Proteins are linear chains of amino acids that are specified by codons found on DNA. How many nucleotide bases form one codon? Select one: 3 4 2 1

In eukaryotic cells, each stage of cellular metabolism generates a different net amount of atp. which stage directly generates the greatest number of atp molecules per metabolized glucose molecule?

Which of the following would most likely to happen if a cell is not able to divide

During the repolarization phase of an action potential which of the following is the primary activity in the membrane of the post-synaptic cell?

What are the name of the structures seen in the chloroplast to the right?