Chapter 25. 25·9–25·11 Sex can lead to fertilization...

Show What You Know - Self Quiz

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You must read each slide, and complete any questions on the slide, in sequence.

Instructions

Check your understanding of concepts from 25·9–25·11 Sex can lead to fertilization, but it can also spread sexually transmitted diseases by answering the following questions.

1.

1. In mammalian fertilization, the extracellular layer of the egg that functions, in part, as a sperm receptor is called the:

acrosome.

zona pellucida.

oocyte.

egg plasma membrane.

jelly coat.

Correct. (See section 25·9 In fertilization, two cells become one.)

Incorrect. (See section 25·9 In fertilization, two cells become one.)

2.

2. At the tip of the sperm is the ________________, equipped with enzymes to help the sperm penetrate the egg.

acrosome

zona pellucida

lumen

jelly coat

zygote

Correct. (See section 25·9 In fertilization, two cells become one.)

Incorrect. (See section 25·9 In fertilization, two cells become one.)

3.

3. Which of the following is TRUE about birth control pills?

They slightly increase the chances of having a boy immediately after a woman "goes off" the pill.

They have been shown to enhance the attractiveness of genetically unrelated men.

On average, users of birth control pills enjoy a reduced risk of ovarian cancer.

They may initiate development of a mucus plug at the cervix, blocking sperm entry.

Both B and D are true.

Correct. (See section 25·10 Numerous strategies can help prevent fertilization.)

Incorrect. (See section 25·10 Numerous strategies can help prevent fertilization.)

4.

4. Why are STDs nearly impossible to eradicate from the population?

Using contraceptives increases the transmission of STDs.

Infected people are often asymptomatic, and all partners have to be treated simultaneously to prevent re-infection.

There are always some people who fail to take their full course of medicine and thus create resistant strains that are nearly impossible to eradicate.

Most STDs are fatal.

Most STDs are untreatable.

Correct. (See section 25·11 Sexually transmitted diseases reveal battles between microbes and humans.)

Incorrect. (See section 25·11 Sexually transmitted diseases reveal battles between microbes and humans.)

5.

5. Tying off the vas deferens will:

decrease testosterone secretion.

cause the breakdown and reabsorption of sperm produced in the future.

shut down spermatogenesis.

make a man incapable of ejaculation.

None of the above.

Correct. (See section 25·10 Numerous strategies can help prevent fertilization.)

Incorrect. (See section 25·10 Numerous strategies can help prevent fertilization.)

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