Where does sperm production takes place?
A) seminiferous tubules
B) Leydig cells
C) epididymis
D) vas deferens
A
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Which of the following do I need to amplify the DNA for gene X and not for gene Y?
a. Some prior knowledge of the sequence of gene X so appropriate primers can be designed. b. a heat-stable DNA polymerase c. restriction endonucleases that cut gene X and not gene Y d. plasmid vectors that have multiple antibiotic resistance genes. e. A cDNA library and access to probes for gene X
Most xylem vessels in angiosperms consist of stacked vessel elements, water flows vertically through ____ and laterally through ____
a. phloem; xylem b. vessel elements; tracheids c. tracheids; vessel elements d. perforation plates; pits e. pits; plasmodesmata
In most plants, glucose is stored as
a. glucose. b. starch. c. sucrose. d. glycogen. e. cellulose
Which statement is true?
A. There is no danger involved in recombinant DNA research in humans. B. There is no danger involved in recombinant DNA research in bacteria. C. There is no danger in releasing recombinant organisms into the environment. D. Stringent safety rules make the use of recombinant DNA research possible. E. Stringent safety rules make the use of recombinant DNA research impossible.