Question 7 (1 point) When a membrane engulfs selected molecules combined with receptor proteins on its surface it is called
a
facilitated diffusion
Ob
C
exocytosis
receptor-mediated endocytosis
passive transport
Od

The terrestrial planets are characterized by having a a.) silicate core b.) iron-rich silicate core c.) iron-rich metallic core d.) none of these

Which of the following statements is true about the relationship between genetic variation and natural selection? a. genetic variation must be present in a population before natural selection can act on it. b. genetic variation arises in a population as a result of natural selection. c. natural selection can act on a population whether there is genetic variation within the population or not. d. after natural selection acts on a population, the amount of genetic variation in the population always increases.

The term facultative anaerobe refers to an organism that