Which of the following statements about Hfr cells and bacterial conjugation is false?
A. An Hfr cell becomes an F- cell if its integrated F plasmid is excised.
B. If excision of the F plasmid from an Hfr cell includes some bacterial genes, a partial diploid can result.
C. The genes that are transferred from an Hfr cell into a recipient cell during conjugation replace the equivalent genes in the recipient cell.
D. An F' plasmid contains some bacterial genes.
E. Cells with integrated F' plasmid have two copies of some genes.
A. An Hfr cell becomes an F- cell if its integrated F plasmid is excised.
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a. autocrine b. endocrine c. paracrine d. systemic e. exocrine
The only extant seed plants that have swimming sperm are the ____
a. cycads b. ginkgos c. conifers d. cycads and ginkgos e. cycads, ginkgos, and conifers
Vitaminsare ____
a. organic substances b. inorganic substances c. required in small amounts for normal metabolism d. organic substances that are required in small amounts for normal metabolism e. inorganic substances that are required in small amounts for normal metabolism
What does being overweight have to do with infertility in women?
A. Leptin levels are higher which impacts GnRH and FSH. B. Follicles are larger than normal and many mature at one time. C. The uterus is displaced and the zygote has difficulty implanting. D. Uterine tissue is located outside of the uterus, causing pain and structural abnormalities. E. The oviducts are blocked.