Electroporation is commonly used to introduce recombinant DNA molecules into cells.
Answer the following statement true (T) or false (F)
True
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Why can scratching or chipping the seed coat speed up the germination of hard-coated seeds like alfalfa?
A. The mechanical stress activates hydrolytic enzymes. B. Water and oxygen can enter the seed to reach the embryo more quickly. C. Carbon dioxide can enter the seed and stimulate photosynthesis. D. Bacteria or fungi can enter the seed and release growth factors. E. Damage to the seed coat triggers the aleurone layer to release amylase.
Which of the following molecules is a pyrimidine?
a. guanine b. phosphate c. uracil d. adenine
Which of the following is a characteristic of all chordates at some point during their life cycle?
A) jaws B) post-anal tail C) four-chambered heart D) vertebrae
In a healthy male, how many sperm cells would be expected to be formed from (a) 400 primary spermatocytes? (b) 400 secondary spermatocytes?
A) (a) 800; (b) 800 B) (a) 400; (b) 400 C) (a) 1600; (b) 800 D) (a) 1600; (b) 1600 E) (a) 100; (b) 800