Prokaryotic cells are smaller than eukaryotic cells. What is a plausible explanation?
A. Prokaryotic cell walls limit their cell growth.
B. Eukaryotes are immobile, allowing them to grow larger.
C. Prokaryotes lack the genetic material needed for protein synthesis.
D. Eukaryotes have compartmentalization, which allows for specialization.
E. Prokaryotes have more diverse energy sources.
Answer: D
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The amniotic egg of reptiles, birds, and mammals is an adaptation to
(a) thwart carnivorous predators. (b) allow life on land. (c) compensate for the short period of development of the young. (d) protect the young from the nitrogenous wastes of the mother during embryonic development.
Some breeds of dogs that are specialized to retrieve objects from bodies of water have webbing between their toes. A change in what cellular response to positional information during digit formation could account for this morphological feature?
A. signals that cause differentiation to toes are not received by cells that become webbing B. signals to cause apoptosis are not received by cells that become webbing C. cells between the future digits migrate, but do not divide once they are in the region that will become toes D. cells between the future digits divide, but do not migrate to the region that will become toes E. cells between the future digits do not divide before migrating to the region that will become toes
Cnidarians of the class ____ are responsible for building coral reefs
a. Anthozoa b. Hydrozoa c. Cubozoa d. Scyphozoa e. Palyzoa.
What happens during photorespiration?
A) The Calvin cycle produces twice as much glyceraldehyde 3-phosphate (G3P). B) The enzyme rubisco uses oxygen as its substrate for the reaction with ribulose bisphosphate. C) Ribulose bisphosphate (RuBP) is broken down into glycolate. D) A second wave of light reactions occurs to replace the Calvin cycle.