Interleukins activate and direct the movement of white blood cells from the blood to the tissues. Indicate whether the statement is true or false
False - chemokines
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Many seeds are capable of surviving in a dormant or quiescent state for many years, or even centuries. Such seeds are not usually damaged by environmental extremes that would kill most other organisms
What main adaptation prevents the seeds from germinating before they are dispersed, and allows them to survive until environmental conditions are favorable for germination and seedling growth? A) A seed coat B) Two cotyledons C) A large quantity of stored nutrients D) Desiccation to 2-20 percent water E) Double fertilization
You are studying cell cycle progression in an early frog embryo. If you were to inject a protein synthesis inhibitor into a cell during S phase, where do you predict that the cells would arrest?
A. G1 B. Telophase C. G2 D. Metaphase
Figure 25.22B
Use the figure above to answer questions 29 through 31.
The letter "C" in the accompanying figure represents which teeth?
A. Incisors B. Molars C. Canines D. Premolars E. Grinders
Infants require many nutrients early in life, including lipids such as fats. A low-fat diet for infants is not recommended because, among other things, it can affect the development of the nervous system. Why does the developing nervous system need
lipids? A) Fats are needed for energy because infants are often on a low-carbohydrate diet. B) Lipids are needed to produce the polypeptide neurotransmitters used by neurons. C) Glial cells need lipids to produce the myelin sheath. D) Fats are required to generate action potentials on nerve cells.