The five-toed limb of stem reptiles was modified into a limb suitable for digging. This is an example of ____
a. convergent evolution
b. morphological divergence
c. analogous evolution
d. morphological convergence
e. distal modification
ANSWER: b
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The greatest concentration of nitrogen on the planet Earth is found in
a. living organisms, including bacteria. b. the atmosphere. c. soil minerals. d. fossil fuels. e. oceans.
A(n) __________ bacterium would not be able to survive in the presence of oxygen
a. facultative aerobic b. facultative anaerobic c. facultative autotrophic d. obligate aerobic e. obligate anaerobic
You are a scientist observing a membrane through which water and some small hydrophobic molecules can freely pass along a concentration gradient from high to low. However, some sugar molecules are too large to pass through the membrane either way without the assistance of passive transport proteins. Additionally, small Na ions and some proteins can pass through the membrane against the concentration gradient, but both require the assistance of active transport proteins. What general type of membrane are you observing?
a. impermeable b. impenetrable c. semipermeable d. completely permeable
Do interkinesis during meiosis I and meiosis II include DNA replication?
What will be an ideal response?