All of the following about Homo habilis is true except
A. the species was replaced by a new kind of human, which had a larger brain.
B. the species coexisted with dinosaurs.
C. the species lived in Africa for 500,000 years and then became extinct.
D. the species was associated with tools.
E. the species was small in stature.
Answer: B
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Archaea were first found ____
a. to be pathogenic b. living on the surface of leaves c. in surface ocean water d. in extreme environments e. in benign environments
What compound diffuses through open stomata into plant tissues thereby initiating photosynthesis?
a. water molecules b. oxygen gas c. carbon dioxide d. potassium ions e. calcium ions
If you could design a modified version of the enzyme to ensure that it would function optimally in the harsh conditions of the washing vat (such as high temperature or high pH), which of the following could you do to achieve this goal?
A) Add more amino acids to the end of the protein to make it more hydrophobic. B) Change the amino acid sequence slightly to ensure a more stable tertiary structure. C) Remove some amino acids from the start of the protein to strengthen its secondary structure. D) Change the amino acid sequence drastically to give the enzyme quaternary structure.
A physiologist is a biologist who studies the
A) structure of body parts. B) evolution of animals. C) physics of living things. D) function of body parts.