Unit Test

Question 1

A Venn diagram can be used to compare and contrast nucleic acids.Which characteristic would be correctly found in B?

Revolt · Accepted Answer

C: made of nucleotides

Question 2

Which statement describes how enzymes and substrates are related?

Revolt · Accepted Answer

A: The enzyme influences the speed of change from substrate to product.

Question 3

Which reaction is exothermic?

Revolt · Accepted Answer

C: a reaction that releases energy into the environment

Question 4

Read the passage about bird food and bird watching. Noted scientist Dr. Elsa Birde described the effect of adding a mixture of dried apples and raisins to the previous feed of sunflower seeds, millet, thistle seed, and cracked corn in bird feeders in her yard. Over three years, Dr. Birde observed that the new mixture increased the number of songbirds at her feeders, especially during the months of April and May. As she has done for several years, Dr. Birde recorded, at the same time each day, the number of birds at each of her four feeders. She noted that the third year using the mixture coincided with the largest increase. There was a twenty-five percent increase in the number of songbirds over times when this mixture was not used. Dr. Birde also noted that in the third year she used a specific ratio of the ingredients, carefully measuring, which she had not done in previous years. The third year also had a warmer than normal spring, and a construction project began in a neighborhood near Dr. Birde’s. Dr. Birde is now going to produce this formula for sale and advertise to customers that they may see the same twenty-five percent increase in songbirds at their feeders.Dr. E. Birde, Journal of Scientific Bird FeedingWhich scientific claim can be made?

Revolt · Accepted Answer

D: A study by Dr. Birde showed that the number of songbirds in her yard increased due to a modified food source.

Question 5

Lactose (milk sugar) is a carbohydrate that is formed by combining galactose and glucose. Which term best describes this molecule?

Revolt · Accepted Answer

B: disaccharide

Question 6

Where does a peptide bond form?

Revolt · Accepted Answer

C: between the amino group of one amino acid and the carboxyl group of another amino acid

Question 7

Dr. Katherine Pollard, a biostatistical researcher, recently changed the method that she used to compare human and chimpanzee DNA. Her research showed that the differences between the two species’ DNA are in segments called switches, which turn certain genes on or off. What is the most likely outcome of Dr. Pollard’s research?

Revolt · Accepted Answer

A: Other scientists will repeat her analysis and this may lead to changes in theories.

Question 8

Which component is affected when a catalyst is added to a chemical reaction?

Revolt · Accepted Answer

B: the activation energy

Question 9

What scientific knowledge about macromolecules is a direct result of Gerardus Johnannes Mulder’s 1838 discovery?

Revolt · Accepted Answer

A: All proteins contain carbon, hydrogen, oxygen, and nitrogen.

Question 10

Which food contains mostly polysaccharides?

Revolt · Accepted Answer

D: pasta

Unit Test Answers

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