Where are sperm stored after they are produced?
a. in the vas deferens
b. in the epididymis
c. in the seminiferous tubules
d. in the penis
Ans: b. in the epididymis
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Which of the following is an organelle in plant cells that stores starches, fats, and proteins?
a. plastid b. mitochondria c. parasite d. fungi
If a cell from the blastoderm of the Drosophila embryo is committed to form part of an abdominal segment of the adult, such as the sixth one, and this cell is transplanted into the thorax-committed region of another embryo, will it develop properties
of a thoracic or an abdominal segment?
Iskander wants to live as long as his great-grandfather, who died at 104, strong and healthy almost to the last. What are some things that could make a difference for his pathway to good health and long life?
What will be an ideal response?
Use your knowledge of amino acid characteristics to order the peptides below according to the net charge contributed by their side chains at physiological pH (~pH 7). Each peptide contains eight amino acids
Use the single-letter amino acid designations to generate your list, placing the most negatively charged peptide on the left and the most positively charged peptide on the right. In addition, for each peptide, list the total number of positive and negative charges. Remember that, at neutral pH, the amino terminus carries a positive charge and the carboxyl terminus carries a negative charge. A. YGAKKRA B. ARRKSTRK C. DERKQNST D. DDAEIYSA E. NQSTYEEG