Which of the following serves as a physical barrier to prevent the sperm cell from getting to the egg cell?
A. abortion
B. IUD
C. condom
D. spermicidal jelly
C. condom
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Many health food stores carry enzyme preparations intended for oral ingestion (by mouth) to supplement existing enzymes in various organs like the liver, heart, and muscle. Use your knowledge of the digestion process to explain why these preparations are unlikely to be effective as advertised.
What will be an ideal response?
Which of the following matings would have the highest frequency of chromosomal gene transfer?
A. F+ x F- B. F' x F- C. Hfr x F-
Which of the following could likely play a role in causing cancer?
1.Cells adhere too strongly to one another, causing a tumor to form. 2.Kinase enzymes add phosphates onto proteins that regulate the cell cycle. 3.The cell cycle skips interphase. 4.Checkpoint proteins make cells “commit suicide.”
The E. coli enzyme responsible for creating unsaturated bonds from saturated bonds in the cell membrane fatty acids at a lower environmental temperature is ________
Fill in the blank with correct word.