Sunday
November 23, 2014

Homework Help: science(please check answers)

Posted by matt on Wednesday, December 4, 2013 at 11:57am.

Identify the choice that best completes the statement or answers the question.

1.Studies conducted in England during the Industrial Revolution have shown that children born to poor families were, on average, shorter than those born to wealthier parents. The most likely explanation for this difference in height is a difference in (1 point)

A.nutrition.(i PICKED THIS)
B.family size.
C.genetic makeup.
D.genetic disorders.
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2.A woman with a genetic disease marries a man who does not carry the disease. It is not possible for their children to carry the disease. The disease must be (1 point)

A.sex-linked.
B.recessive.
C.dominant.(I PICKED THIS)
D.caused by an extra chromosome.
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3. Which of the following is an example of inbreeding? (1 point)

A.A farmer chooses the cows in his or her herd that produce the most milk and breeds only those cows.(I PICKED THIS)

B.A farmer chooses the cows in his or her herd that produce the most milk and breeds them with cows that get sick less often.

C.A farmer chooses the cows in his or her herd that produce the most milk and injects them with hormones that make them produce more milk.

D.A farmer chooses the cows in his or her herd that produce the most milk and pulls them out of the breeding stock.

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4.Scientists have inserted the gene for human insulin into bacteria. These bacteria make the insulin protein, which can then be used by people who have diabetes. This process is an example of (1 point)


A.hybridization.
B.gene therapy.
C.selective breeding.
D.genetic engineering.(I PICKED THIS)
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5. Which of the following correctly identifies the sequence of stages of human development? (1 point)

A.embryo zygote fetus embryo
B.blastocyst embryo fetus zygote
C.zygote blastocyst embryo fetus( I PICKED THIS)
D.blastocyst zygote embryo fetus
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6.The main purpose of the testes is to make (1 point)
A.eggs.
B.embryos.
C.sperm.(I PICKED THIS)
D.zygotes.

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7. Egg-laying land animals have evolved to produce eggs with tough shells to ensure that (1 point)

A.external fertilization can take place.
B.the egg and the sperm can fuse.
C.parental care is unnecessary.
D.the developing embryo does not dry out.(I PICKED THIS)

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8. An insect undergoes major changes in its life cycle—from egg, to larva, to pupa, to adult. This insect goes through (1 point)

A.metamorphosis.( I PICKED THIS)
B.budding.
C.alternation of generations.
D.internal fertilization.
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9.A woman gives birth to a son. What is the probability that her second child will be a girl? (1 point)

A.0 percent
B.25 percent
C.50 percent(I PICKED THIS)
D.100 percent
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10.Two identical flowering plants are planted in neighboring yards. One plant grows tall and healthy, producing numerous pink flowers. The other is small, has brown leaves, and never flowers. What could be the difference between the two plants? (1 point)

A.One of the plants is in the sporophyte generation, which does not flower, while the other is in the gametophyte generation.

B.One of the plants has access to the pollinator it needs, while the other does not.

C.One of the plants contains the genetic information that tells it to flower, while the other does not.

D.One of the plants has the nutrients and light it needs to grow and flower, while the other does not.( I PICKED THIS)
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11. Over time, a plant pollinated by a hummingbird has developed very long, tube-like flowers. Why might the flower have adapted in this way? (1 point)

A.The longer, tube-shaped flowers probably developed to keep the hummingbird from reaching and drinking the flower’s nectar.

B.The longer, tube-shaped flowers probably developed so that the hummingbird must stick its head in the flower to drink the nectar.( I PICKED THIS)###

C.The longer, tube-shaped flowers probably developed so that pollen would not fall into them as a hummingbird flies past.

D.The longer, tube-shaped flowers probably developed so that hummingbirds could land on them.

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