The enzyme responsible for converting free carbon dioxide in the blood into forms in which it can be
transported in the blood is
a. carbonic anhydrase.
b. carboxypeptidase.
c. carbonase.
d. decarboxylase.
e. dehydrogenase.
A
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The DNA sequence capable of pairing with 5' CGATTAGT 3' is:
A. 5' CGATTAGT 3'. B. 5' GCTAATCA 3'. C. 3' CGATTAGT 5'. D. 3' GCTAATCA 5'.
When you go to your supervisor to give your diagnosis, which of the following hypotheses do you present to support it?
ALD is a fatal disease that results from a lack of peroxisomes in the liver. It is diagnosed by the presence of high levels of very long-chain fatty acids in the blood. The disease results in destruction of brain myelin leading to progressive cognitive impairment, coma, and death by the age of 14. There has never been a case of ALD described in girls. You have just started your internship at the Mayo clinic and a 10-year-old girl comes in who is in a coma and having seizures. Blood tests show she has extremely elevated levels of long-chain fatty acids. This looks like ALD, but a girl has never been afflicted. A. Both her mother and father are recessive carriers of ALD. B. Most of the Barr bodies in her liver have a normal peroxisome gene. C. Her mother is a carrier for ALD. D. She has Turner syndrome. E. Her mother is a carrier, and she could have genetically normal Barr bodies in the liver or Turner syndrome.
A waxy cuticle is secreted by _____
a. ground tissue c. a stoma b. epidermal cells d. root hairs
Why do some biologists NOT consider reptiles to be a monophyletic group?
A) Birds are the direct descendants of some reptiles. B) All reptiles do not reproduce sexually. C) The ancestors of reptiles are the class Amphibia. D) Reptiles, birds, amphibians, and fish appeared in the fossil record at approximately the same time. E) Reptiles evolved independently at several different times in the past and from several different ancestral species.