Answers Biology - SC3209 ICThe Digestive System

The Digestive System — Cumulative exam Answers

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What is the function of the hormone progesterone?

preparation of the body for maintaining pregnancy

development of male secondary sex characteristics

development of female secondary sex characteristics

preparation of the fallopian tube for fertilization

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The graph shows the changing levels of hormones during menstruation and ovulation. What happens to hormone levels during ovulation, and why is this important?

The hormone levels increase to prepare a woman’s body to receive a fertilized egg.

The hormone levels decrease to prepare a woman’s body to receive a fertilized egg.

The hormone levels increase, and the next menstrual cycle begins with shedding of the uterine lining.

The hormone levels decrease, and the next menstrual cycle begins with shedding of the uterine lining.

Which is an advantage of producing genetically engineered crops that have pest-resistant genes?

bioaccumulation of pesticides

allows farmers to grow any crop they want

reduces the use of pesticides for certain insects

gene transfer to nontarget species

Smallpox is a virus that causes a rash that then turns into painful blisters. The last known case of smallpox was in 1977. What is the best explanation for the eradication of smallpox?

People are exercising more than they used to.

Genetic testing determines who is more prone to smallpox.

There was an increase in antibacterial products.

An effective vaccine was developed.

Antoinette was diagnosed with hypertension, a noncommunicable disease in which her blood pressure is higher than normal. What is the most likely explanation for why she is hypertensive?

She had a diet high in salt intake.

She did not wash her hands enough.

She was bitten by a mosquito.

She was never vaccinated against hypertension.

Which form of natural selection does the graph represent?

directional selection

disruptive selection

sexual selection

stabilizing selection

The sketch shows a rynchosaur, an extinct animal that is known only from fossils. There has been much debate about the classification of these creatures. Some scientists suggest that they belong with primitive amphibians, and some think they are related to snakes and lizards. The data equally support both cases.Which statement best explains how to draw a cladogram that includes the rynchosaur?

Draw the cladogram for amphibians.

Draw the cladogram for reptiles.

Draw two cladograms, both showing the traits, and leave it as a hypothesis.

Draw two cladograms, both showing the traits, and have scientists vote.

Drosophila eye color is an X-linked trait. Red eye color is dominant, and white eye color is recessive. Which Punnett square shows a cross in which the probability that offspring will be red-eyed males is 25 percent?

A Punnett square is shown. The columns are labeled Upper X r and Upper Y. The rows are labeled x Upper R and x Upper R. Clockwise, from top-left, the boxes include: X Upper R X r, X Upper R Y, X Upper R Y, X Upper R X r.

A Punnett square is shown. The columns are labeled Upper X r and Upper Y. The rows are labeled x Upper R and x r. Clockwise, from top-left, the boxes include: Upper X r Upper X r, Upper X r Upper Y, Upper X r Upper Y, Upper X r Upper X r.

A Punnett square is shown. The columns are labeled Upper X r and Upper Y. The rows are labeled x r and x r. Clockwise, from top-left, the boxes include: Upper X r Upper X r, Upper X r Upper Y, X r Upper Y, Upper X r Upper X r.

A Punnett square is shown. The columns are labeled Upper X Upper R and UpperY. The rows are labeled x r and x r. Clockwise, from top-left, the boxes include: Upper X r Upper X Upper R, Upper X r Upper Y, X r Upper X Upper R, Upper X r Upper X Upper R.

Punnett squares are used to show possible combinations of alleles or to predict the probability of a trait occurring in offspring. A pansy that is homozygous for purple flowers (PP) is crossed with a pansy that is homozygous for pink flowers (pp). Which genotypes will be included for the offspring in the Punnett square for this cross?

PP, Pp, and pp

PP and pp

PP and Pp

Pp only

Which statement best describes the relationship between antigens and antibodies?

Antigens cause the lymph nodes to decrease in size, and antibodies cause the lymph nodes to increase in size.

Antibodies cause the production of antigens, and antigens attack antibodies.

Antigens cause lymph to be clear, and antibodies cause lymph to become yellow.

Antigens cause the production of antibodies, and antibodies attack antigens.

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The Digestive System — Cumulative exam Answers

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