In both males and females, primary sex organs called _________________ produce the gametes
Fill in the blank with correct word.
gonads
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MHC class I molecules present peptide fragments that are either "self" or "nonself"; in either case, the fragment becomes bound to the molecule while
A. in the rough endoplasmic reticulum. B. in the cytosol. C. in a secretory vesicle. D. in the Golgi apparatus.
Secondary spermatocytes each contain
A) 23 single chromosomes. B) 23 chromosomes, each with a pair of duplicate chromatids. C) twice the diploid number of chromosomes. D) 46 pairs of chromosomes. E) 46 chromosomes.
The cardioregulatory center of the brain is located in the
A. hypothalamus. B. medulla oblongata. C. cerebellum. D. cerebrum. E. diencephalons.
Since proteins are needed by the body, all twenty amino acids are considered essential amino acids.
Answer the following statement true (T) or false (F)