Populations within ecosystems interact in many ways. Some of these interactions affect the evolution of a population. Which ecological interaction is required for natural selection to act on a population?
a) parasitism
b) competition
c) predation
d) mutualism
Ans: b) competition
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These are the primary cellular sites for the extraction of energy from organic compounds
a. Golgi bodies b. ribosomes c. mitochondria d. lysosomes e. endoplasmic reticula
What is a significant difference between a lytic and a lysogenic cycle?
What will be an ideal response?
A human kidney filters about 200 liters of blood each day. Approximately two liters of liquid and nutrient waste are excreted as urine. The remaining fluid and dissolved substances are reabsorbed and continue to circulate throughout the body. Antidiuretic hormone (ADH) is secreted in response to reduced plasma volume. ADH targets the collecting ducts in the kidney, stimulating the insertion of aquaporins into their plasma membranes and an increased reabsorption of water. If ADH secretion is inhibited, which of the following would initially result?
(A) The number of aquaporins would increase in response to the inhibition of ADH. (B) The person would decrease oral water intake to compensate for the inhibition of ADH. (C) Blood filtration would increase to compensate for the lack of aquaporins. (D) The person would produce greater amounts of dilute urine.
Which of the following is associated with the greatest ability to withstand unfavorable conditions?
a. Capsule b. Cell membrane c. Fimbriae d. Endospore e. Cell wall