Which structures found in ferns are lacking in
mosses?
a. spores
b. gametophytes
c. xylem
d. sporophytes
e. flagellated sperm
C
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The presence of a specific plasmid in a bacterial cell may be determined if the plasmid _____
A. is exceptionally large B. is an expression vector C. contains pieces of a viral genome D. contains a selectable marker
Homologous recombination may result in gene conversion when used to fix double-stranded DNA breaks because
A) sister chromatids are always identical. B) homologous recombination is prone to errors, potentially causing permanent genetic mutations. C) strand invasion may introduce new genes onto the damaged chromosome. D) homologous chromosomes may carry different alleles of the same gene. E) the Holliday junction may migrate, resulting in loss of genetic material.
Which of the following would be an external parasite?
A. a bird that aids large mammals by eating parasites in the skin of the large mammal B. a fungus living on the dead remains of a tree C. a cowbird that lays its eggs in the nest of another species of bird D. a flea that lives among the feathers and feeds on the blood of a bird
The stacked grana are disk-shaped, interconnected membranous sacs embedded in the membrane of the stroma
Indicate whether the statement is true or false