It is commonly said that plants, especially trees, produce oxygen, but this is an oversimplification of metabolism in plants. Which of these statements is more accurate?
a. Plants produce oxygen ions into the atmosphere which recombine into ozone molecules.
b. Plants only release oxygen when supplied with adequate quantities of glucose and water.
c. Plants release oxygen during photosynthesis and reabsorb it during carbohydrate catabolism.
d. Plants only produce oxygen after they have been digested or decomposed by other organisms.
c. Plants release oxygen during photosynthesis and reabsorb it during carbohydrate catabolism.
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In most environments, two or more organisms occupy identical niches
Indicate whether the statement is true or false
Each of the following are features of a cloning host except
A. mapped genome. B. transformable. C. minimal growth requirements. D. pathogenicity. E. quick generation time.
For a gene with two alternative alleles, A (with a frequency of p) and B (with a frequency of q), the term in the algebraic form of the Hardy-Weinberg equilibrium for the heterozygote genotype frequency is
A. p2. B. q2. C. 2pq. D. (p+q)2. E. 2Aa.
The MHC (major histocompatibility complex) is NOT important in
A. distinguishing self from non-self. B. recognizing infected cells. C. identifying bacterial pathogens. D. identifying abnormal cells. E. presenting antigenic determinants.