All cells produce waste products during the normal course of their metabolic activities. These wastes called _______ may contribute to cell aging and death.
Fill in the blank(s) with the appropriate word(s).
Answer: oxygen free radicals
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When molecules are broken apart in
respiration, a. the heat produced is used to drive biological reactions. b. the oxygen in the compounds that are broken apart is used as an energy source. c. the energy released is channeled into molecules of ATP. d. ATP is converted into ADP. e. ADP is released as a waste product
Which of the following statements is true?
a. The hydrogen bonding of cytosine to guanine is an example of complementary base pairing. b. In DNA, adenine always base pairs with guanine, and cytosine always base pairs with thymine. c. Each of the four nucleotides in a DNA molecule has the same nitrogen-containing base. d. When adenine base pairs with thymine, they are linked by three hydrogen bonds. e. None of these statements are true
The temperature, humidity, precipitation, wind, cloudiness, and other atmospheric conditions that occur at a specific place and time are referred to as ________
Fill in the blank(s) with correct word
It is considered healthy to have high levels of high-density lipoproteins (HDL). Why is this true?
A) HDL is important in making complete proteins. B) HDL moves cholesterol to the heart. C) HDL moves cholesterol to the liver for disposal. D) HDL is a form of saturated fat.