Which of the following is true of ejaculation?
A. Cowper's glands secrete fluid only after ejaculation.
B. The ejaculatory duct opens into the seminiferous tubules.
C. An average ejaculate contains about 200 million sperms.
D. Upon ejaculation, sperms pass from one testis to the other.
C. An average ejaculate contains about 200 million sperms.
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Air-breathing insects carry out gas exchange _____
A) in their specialized external gills B) in their specialized internal gills C) in the alveoli of their lungs D) across the finest branches of the trachea and cell membranes E) across all parts of their thin cuticular exoskeleton
How long is a typical C-C bond?
a. 0.580 nm b. 0.107 nm c. 0.154 nm d. 0.214 nm
When glucose is used as the energy source, the largest amount of ATP is produced in
a. glycolysis. b. acetyl-CoA formation. c. the Krebs cycle. d. substrate-level phosphorylation. e. electron transport and oxidative phosphorylation.
Why does sickle-cell hemoglobin (HbS) migrate slower than normal hemoglobin (HbA) during gel electrophoresis?
What will be an ideal response?