Which population was unaffected by density-dependent factors?
A) elk in Yellowstone National Park in the 1970s
B) Norway lemmings
C) yeast that ferment grape juice into wine
D) bacteria kept in a culture that has its nutrients constantly replenished
D
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What two structures must interact in order to translate an mRNA into a polypeptide?
a. Ribosomes and tRNA b. DNA and amino acids c. tRNA and mRNA d. Ribosomes and DNA e. Amino acids and ribosomes
Which of the following cell types has NO nucleus?
A) erythrocytes B) lymphocytes C) phagocyte D) All of these cells lack a nucleus.
An animal is in an environment with a higher than normal temperature. It no longer has enough energy to reproduce or maintain homeostasis. What kind of environment is it in?
a. Suboptimal zone b. Zone of intolerance c. Zone of thermal instability d. Zone of stress
What does a producer need for performing photosynthesis, and what does photosynthesis produce?
What will be an ideal response?