Which of the following is NOT a contributing factor
in species extinction?
a. habitat loss
b. overharvesting
c. habitat fragmentation
d. conservation biology
e. illegal wildlife trading
Answer: d
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The theory of endosymbiosis is based on
A. evidence from the fossil record. B. the experiments in which bacteria were made to grow in plant cells forming chloroplasts. C. the knowledge that ribosomes are structures found in bacteria, plants, and animals. D. similarities between chloroplasts and other organelles in animals. E. the observations that chloroplasts and mitochondria resemble bacteria.
As a researcher, you are charged with determining the side effects of a new drug. From previous
observations, you suspect that this drug reduces the rate of DNA production (replication) within skin cells of patients using the drug. With the following materials, design an experiment that would answer your questions about the effect of the drug on DNA production. You know that: DNA contains phosphate groups. You have: radioactive isotopes of phosphate (32P), skin cell cultures from various patients, the drug in question, and a device that measures radioactivity. What will be an ideal response?
An interwoven mass of a fungus composed of one-cell-thick, thread-like hyphae is called the _____.
Fill in the blank(s) with the appropriate word(s).
A group of three mRNA nucleotides that translate to an amino acid is called a(n)
A. dictionary. B. initiator. C. codon. D. uncodon.