Chromosomes exchange genetic information by
A. fertilization.
B. mitosis.
C. syngamy.
D. DNA replication.
E. crossing over.
E. crossing over.
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Fecal transplants have been successfully used to treat Clostridium difficile colitis by reintroducing healthy fecal microbiota that outcompete the C. difficile.
Answer the following statement true (T) or false (F)
Which type of bond must be broken for water to vaporize?
A) ionic bonds B) both hydrogen bonds and ionic bonds C) polar covalent bonds D) hydrogen bonds E) both polar covalent bonds and hydrogen bonds
If a sperm cell containing a defective copy of the gene on the Y chromosome that encodes testosterone fertilizes an egg, what effect will this have on the developing embryo?
a. There will be no effect so long as the X chromosome is intact. b. The cells of the embryo will undergo apoptosis early in development. c. The embryo will develop female sexual tissues and characteristics. d. Increased hair growth will begin in utero and continue until adolescence.
Four of the following statements are true regarding roots. Which one is NOT true?
A. Roots anchor a plant in soil, and in many species, they store nutrients. B. An extensive root system provides a plant with a very large surface area for absorbing water from the soil. C. When a seed germinates, the first structure to emerge from it is a root. D. In typical monocots, a primary root is quickly replaced with a mat of adventitious roots. E. In typical eudicots, the primary root that emerges from a seed thickens and lengthens to become a fibrous root.