Which of the following statements is true?
(a) Another name for the fertilized egg cell is the zygote.
(b) Diploid organisms reproduce only sexually.
(c) All sexually reproducing organisms must have two copies of every chromosome.
(d) Gametes have only one chromosome.
Choice (a) is correct. Some diploid organisms (for example, many plants) are capable of asexual reproduction [choice (b)]. Many organisms have sex chromosomes that are only present in one copy in the diploid organism [choice (c)]. Gametes have only one member of each pair of homologous chromosomes, but because most organisms have more than one pair of homologous chromosomes, most gametes have more than one chromosome [choice (d)].
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Which of the following can be used as a vector for gene therapy?
A. Liposomes B. Parvoviruses C. Adenoviruses D. Retroviruses E. All of the answers are correct
Respond to statements 82–85 with reference to the five plant
macronutrients listed below. a. nitrogen b. potassium c. magnesium d. phosphorus M 82. This nutrient helps to maintain turgor pressure. M 83. This nutrient is an extremely important part of ATP. M 84. This nutrient is an important part of the backbone structure of DNA. M 85. This nutrient is essential to formation of chlorophyll and acts as a cofactor for many enzymes.
Mendel’s principle of independent assortment is directly related to an event that occurs in _____ of
meiosis. A. prophase I B. metaphase I C. anaphase I D. prophase II E. metaphase II
Application of heat to living cells can result in all of the following EXCEPT
A) breaking of hydrogen bonds. B) alteration of membrane permeability. C) denaturation of enzymes. D) decreased thermal death time. E) damage to nucleic acids.