A ribozyme is a molecule of RNA that has catalytic properties.
a. true
b. false
Ans: a. true
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Macronutrients are defined as those elements:
A. required in certain relative amounts in the plant. B. usually needed, but not always available. C. required in relatively large amounts. D. only taken up through the soil.
Answer questions 120–124 in reference to the five items listed
below. a. 12 b. 23 c. 24 d. 46 e. 47 D 120. How many chromosomes does each somatic cell have in a human male who has two X chromosomes? D 121. Following a gene duplication event involving only five loci, how many chromosomes will a human female have? D 122. How many chromosomes are present in the somatic cells of a child born with Down syndrome (trisomy 21)? D 123. How many chromosomes are present in each cell of the germ cell line for a tetraploid species where its normal complement of chromosomes is 48? D 124. The normal sperm cell of species X carries 11 chromosomes. Following nondisjunction in the formation of secondary spermatocytes and their subsequent fertilization of normal ova, some of the zygotes will have 21 chromosomes, others will have 22, and the remainder will have how many chromosomes?
The most inclusive level of organization is exemplified by which of the following?
A. Heart B. Carbon atom C. DNA D. Zebra E. Red blood cell
To introduce a particular piece of DNA into an animal cell, such as that of a mouse, you would most likely be successful with which of the following methods?
A) electroporation followed by recombination B) introducing a plasmid into the cell C) infecting the mouse cell with a Ti plasmid D) transcription and translation