The coral organisms on a coral reef cannot be replaced by any other organism. For that reason, we identify those species as:
A) ecological dominants. B) symbiotic species.
C) mutualistic species. D) keystone species.
Answer: D
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A contraceptive pill that continuously inhibits the release of gonadotropin-releasing hormone (GnRH) from the hypothalamus will _____
A) increase the production of estrogen and progesterone by the ovaries B) initiate ovulation C) reduce the secretion of luteinizing hormone (LH) and follicle-stimulating hormone (FSH) from the anterior pituitary gland D) stimulate the secretion of luteinizing hormone (LH) and follicle-stimulating hormone (FSH) from the posterior pituitary gland E) increase the flow phase of the menstrual cycle
The graph below shows the rate of transport for each substance when the cells are placed in 0.10 mM solutions of A, B, and C. Based on these data and coupled with the data observed above, substance C is transported via ________.
A) active transport
B) facilitated transport
C) passive transport
D) simple diffusion
E) choices A, B, and C
What critical role is often played by pigs in the epidemiology of influenza virus?
A. Pigs are the reservoir for influenza virus and most humans become infected by contact with respiratory secretions of pigs. B. Pigs are the reservoir for influenza viruses and disease can be transmitted to humans by consuming undercooked pork. C. Pigs harbor influenza viruses that are much more virulent than avian strains and human strains. D. Pigs can become infected simultaneously with both human, avian, and swine varieties of influenza viruses, providing an opportunity for genetic recombination resulting in antigenic drift.
When soil is dry, guard cells respond to _____ by collapsing against one another, so stomata close
a. air temperature c. abscisic adic b. low humidity d. oxygen