Some plants have cultivated a symbiotic relationship with soil bacteria capable of fixing atmospheric nitrogen. Why do plants need nitrogen?
a. to build lipids important in membranes and energy storage
b. to make the saccharides used to build their cellulose cell walls
c. to synthesize amino acids that are used to form proteins
d. nitrogen is an important energy source to plants that cannot harvest sunlight
c. to synthesize amino acids that are used to form proteins
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Streptobacillus moniliformis is unusual in that it spontaneously forms L-forms
Indicate whether this statement is TRUE or FALSE.
What are the arrows pointing to in the accompanying figure?
a. double ionic bonds b. single ionic bonds
c. double covalent bonds d. single covalent bonds e. hydrogen bonds
A yeast artificial chromosome (YAC) is a ____ that can accommodate large DNA inserts and uses the eukaryote yeast
as a host cell. a. restriction enzyme produced from yeast chromosomes b. labeled nucleic acid used to identify a clone within a genome and c. q arm of chromosome 15 within a cell that encodes for a restriction enzyme and d. cloning vector that has telomeres and a centromere e. cloning vector that has 23 chromosomes
What is true for both male and female gametogenesis? (Choose all that apply.)
A. Gametes develop in the gonads. B. Gametes are produced by meiosis. C. Each primary cell results in four gametes. D. Primary cells are haploid.