Where are sperm produced? A. Vas deferens
B. Testes
C. Ejaculatory duct
D. Epididymis

This is a situation in which genes are attached to an organism's sex chromosomes; the sex of an organism influences the expression of a gene.

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.

Which type of transport is responsible for oxygen entering into blood cells? a. vesicle b. passive c. facilitated d. active b. passive