Cells that can break down bone matrix by secreting enzymes and acids are called ________
a. osteocytes
b. osteoclasts
c. marrow
d. osteoblasts
b
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Purine bases, such as adenine and guanine, have ________ joined ring(s) for their structure, compared to pyrimidine bases, such as cytosine and thymine, that have ________ ring(s) in their structure.
Fill in the blank(s) with the appropriate word(s).
Coenzyme Q (also known as ubiquinone or CoQ) is often found in lotions and moisturizers. Given
what you know about its role in cellular respiration, infer what it might be doing in these products.
a. It helps glycolysis proceed faster in the cytosol of skin cells. b. It absorbs dangerous free radicals (loose electrons) that can cause aging. c. It decreases the rate of metabolism and slows cellular growth. d. It is absorbed and used by cells with a high metabolism. e. It causes older cells to spontaneously die and regenerates new cells.
Members of two different bird species mate and
produce viable, fertile offspring. Members of neither parent species recognize the courtship song of the hybrids. The hybrids are subject to a. mechanical isolation. b. gamete mortality. c. behavioral isolation. d. ecological isolation. e. hybrid inviability.
Why is speciation via changes in ploidy more likely with self-fertilizing plants than with plants that cannot self-fertilize?
What will be an ideal response?