Repressible operons require that ________ binds to the repressor protein before it can bind to the operator.
A. a cofactor
B. the substrate
C. the product
D. the reactant
E. a coenzyme
Answer: C
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Were there any eukaryotic cells on Earth 1.5 billion years ago?
A. No, they do not appear in the fossil record until around 1 million years ago. B. Yes, they first appear in the fossil record around 1.8 billion years ago. C. No, they do not appear in the fossil record until around 500 million years ago. D. Yes, they first appear in the fossil record around 3.5 billion years ago.
If you were stranded in the Sahara Desert with very little water, you would likely die as a result of
a. dehydration. b. hyperthermia. c. hypothermia. d. dehydration and hyperthermia. e. dehydration. hyperthermia and hypothermia.
If an investigator removes the mesoderm from an
embryo, the development of which of the following systems is least likely to be affected? a. circulatory system b. muscle system c. reproductive system d. integumentary system e. excretory system
Surfactants is one of the later components made in the fetus (prior to birth).
a. true b. false