Horizontal gene transfer is less prevalent in eukaryotic species because
A. of the presence of organelles in the cells of eukaryotic species.
B. of the multicellularity in eukaryotic species, which is laking in prokaryotic species.
C. eukaryotic species reproduce by sexual reproduction.
D. of multicellularity and sexual reproduction.
E. of the presence of organelles and multicellularity.
D. of multicellularity and sexual reproduction.
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CD4 molecules are found on T ________ cells, whereas CD8 molecules are characteristic of T________ cells.
Fill in the blank(s) with the appropriate word(s).
All behavior
(a) has a genetic component. (b) involves learning. (c) requires a conscious decision. (d) both a and c.
Answer the following statements true (T) or false (F)
1. Flowers, fruits, and endosperm are defining characteristics of the angiosperms. 2. Placental transfer tissues are necessary because plant embryos are incapable of photosynthesis. 3. The K/T event was the transition of plants from water to land. 4. Horizontal gene transfer is restricted to prokaryotes and protists.
When we metabolize our food, we produce heat that helps to keep us warm. Which of the following best describes why?
A) Producing ATP from ADP is exothermic; therefore, energy is released in the form of heat. B) When we break down food, all energy in the food is directly released in the form of heat. C) When we break down our food, the reactions are not 100 percent efficient; therefore, energy is lost as heat. D) Chewing is exothermic; therefore, energy is released in the form of heat when we eat food.