Meiosis can occur
a. in all sexually reproducing organisms.
b. only when an organism is diploid.
c. only in multicellular organisms.
d. only in haploid organisms.
e. only in single-celled organisms.

All organisms contribute some water to the water cycle by conducting

You have just sequenced a new protein found in mice and observe that sulfur-containing cysteine residues occur at regular intervals. what is the significance of this finding? it will be important to include cysteine in the diet of the mice. cysteine residues are required for the formation of α helices and β pleated sheets. cysteine residues are involved in disulfide bridges that form tertiary structure. cysteine causes bends, or angles, to occur in the tertiary structure of proteins.

Oak and maple trees, chipmunks, white-tail deer, and black bears emerging from hibernation are all organisms that may be found in which biome