Some STDs cause infertility. How?
What will be an ideal response?
STDs can cause infertility by producing scar tissue in the vas deferens and uterine tubes. Two examples are gonorrhea and chlamydia.
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The renal vein sends blood back to the heart via which vein?
a. iliac vein b. gastric vein c. inferior vena cava d. superior vena cava
Mature sperm function best
A) at temperatures slightly warmer than body temperature. B) at temperatures slightly cooler than body temperature. C) when high concentrations of glucose are available as an energy source. D) when the pH of semen is below 6.0. E) when the pH of semen is above 8.2.
Which of the following phrases INCORRECTLY completes the following statement? The Hox complexes of mammals
A. encode genes homologous to those found in the antennapedia and bithorax complexes. B. are located on a single chromosome, similar to what is seen in Drosophila. C. follow the colinearity rule. D. determine cell fate on the anteroposterior axis. E. suggest there is a basic body plan that is followed by all multicellular organisms.
Which of the following would be a valid characteristic of animals that may also be shared by other groups of organisms?
A) All animals are relatively large. B) Some animals are sessile their entire lives. C) All animals are multicellular. D) Some animals are photosynthetic. E) Some animals have cell walls.