Which of the following is NOT true for a population
growing exponentially?
a. The number of individuals added to the
population in a year is greater than it was the
previous year.
b. The population growth rate increases year after
year.
c. Its r remains constant in the short-run.
d. The doubling time remains constant.
e. All of these are NOT true.
Answer: d
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Which pattern of diploid and haploid phases reflects the life cycles of some fungi and algae, but NOT the life cycles of plants or animals?
a. two haploid generations followed by a diploid generation b. one haploid generation followed by two diploid generations c. a life cycle that limits the diploid state to a single cell produced by fertilization d. alternation between haploid and diploid generations
Although Earth’s ecosystems are remarkably diverse in their characteristics, they all run on energy captured by ____
a. autotrophs b. heterotrophs c. consumers d. decomposers e. detritivores
Your friend is trying to learn about how to kill bacteria. She reads that preservatives such as citric acid are added to foods because the acidic environment kills bacteria by denaturing their proteins
She thinks this sounds like a lot of scientific jargon and asks you what it means. How can you explain it in simpler terms? A) Denaturing their proteins means that the proteins in bacteria are converted into carbohydrates. B) Denaturing refers to the fact that the bacterial cells divide too quickly and die. C) The acid causes the cells to swell and burst open, also known as denaturation. D) Denaturing means that the proteins of the bacteria lose their structure and can't function, so the bacteria die.
Transmutation of an element (the change of an element into a different element) occurs due to
a. exposure to strong sunlight. b. exposure to certain chemicals. c. natural aging of the element. d. combining with another element. e. radioactive decay.