What organelle is believed to have once been a free living prokaryote that moved into our cells and became a permanent guest?

Select one:

a. mitochondria

b. nucleus

c. cytosol

d. none of these

Skin cells are lost daily even without injury. Which best describes the purpose of the cell cycle for skin cells in this circumstance? A.) reproduction B.) repair C.) synthesis D.) growth

Soon you will synthesize the analgesic acetanilide in lab. it's m. p. is 114 c. what does it indicate about your product if you obtain a m. p. of 103-112c?

An atom of carbon (C) forms covalent bonds with two atoms of oxygen (O) to form carbon dioxide How are the valence electrons of these atoms rearranged to form the bonds?

Which of the following explains why water is a good solvent for polar and ionic compounds?

What best describes the composition of soil

Which of the following is the most likely cause of succession in ecosystems? a. arrival of new species b. rain c. loss of an animal species d. wildfires

Three genes control the production of tail structures in dogs. The wag1 gene promotes the production of tail structures. However, the brkn gene inhibits wag1 activity. Another gene, ntrdr, stimulates activity of the brkn gene.

From the following list, correctly identify the reason (s) that might explain a decrease in Vmax due to a suboptimal pH during an enzyme assay. a. Protonation of the substrate b. Deprotonation of the amino acids in the enzyme's active site c.

Caracterize células eucariontes dando exemplos

Natural _ - the mechanism for evolution.