The position of a specific gene on a chromosome can be determined by:
a. preparing a karyotype.
b. southern blotting.
c. genomic hybridization.
d. chromosome sorting.
e. fluorescent in situ hybridization
E
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Dead Artemia cells that have been treated with trypan blue appear
(a) colorless. (b) blue. (c) red. (d) indistinguishable from living treated cells.
Exotoxins are ________.
A. antiphagocytic factors B. lipopolysaccharides C. proteins secreted by living bacterial cells D. secretions that always target nervous tissue E. only released after a cell is damaged or lysed
During male ejaculation, the internal urethral sphincter closes tightly to
A) prevent urine from leaking into the urethra. B) isolate the ureters from the urinary bladder. C) block movement of mucus from the bulbourethral gland into the ejaculatory duct. D) keep sperm from moving into the ductus deferens. E) allow seminal vesicle to transfer sperm to the epididymis.
The formation of a zygote and a cell with a triploid nucleus is unique to flowering plants. What is this process called?
A) fertilization B) double fertilization C) germination D) pollination