Answer the following question given this paragraph: Enzymes are extremely efficient in speeding up reactions. They can catalyze up to several million reactions per second. As a result, the difference in rates of biochemical reactions with and without enzymes may be enormous. A typical biochemical reaction might take hours or even days to occur under normal cellular conditions without an enzyme, but less than a second with an enzyme. Q: Enzymes in cellular reactions work to do what to the reaction? Choices: - increase yield - decrease heat - slow it down - speed it up A:
speed it up
Answer the following question given this paragraph: Differences in density between water and air lead to differences in pressure. Q: Differences in density between water and air lead to differences in what? Choices: - resistance - sound - energy - pressure A:
pressure
Q: Answer the following question given this paragraph: Image copyright Sebastian Kaulitzki, 2013. The small intestine is lined with tiny villi that help absorb nutrients . Used under license from Shutterstock. com. Q: What is the small intestine lined with that helps with nutrient absorption? Choices: - bile - hilum - cannula - villi A:
A: villi
Question: Answer the following question given this paragraph: Has this ever happened to you? A student sitting next to you in class has a cold. The other student is coughing and sneezing, but you feel fine. Two days later, you come down with a cold, too. Diseases like colds are contagious. Contagious diseases are also called infectious diseases. An infectious disease is a disease that spreads from person to person. Q: Meaning a disease that spreads from person to person, what term is synonymous with "contagious"? Choices: - benign - harmless - noncommunicable - infectious A:
Answer: infectious
*Question*
Answer the following question given this paragraph: Waves may reflect off an obstacle that they are unable to pass through. When waves are reflected straight back from an obstacle, the reflected waves interfere with the original waves and create standing waves . These are waves that appear to be standing still. Standing waves occur because of a combination of constructive and destructive interference. You can see animations of standing waves at the URLs below. Q: What do waves do when they are unable to pass through an object? Choices: - produce off - Roll over. - develop off - reflect off A:
**Answer**
reflect off
Answer the following question given this paragraph: Q: What is the term for the muscular duct through which sperm are propelled? Choices: - the glarus deferens - the glans deferens - the vasteras deferens - the vas deferens A:
the vas deferens