Which of the following is a characteristic of prokaryotic cells?
a. They are generally multicellular.
b. They have chloroplasts and mitochondria.
c. The DNA is located in a condensed region called the nucleoid.
d. They form complex tissues.
c. The DNA is located in a condensed region called the nucleoid.
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Friedrich Miescher, after he began to study the chemical composition of the nucleus, was one of the first to ____
a. propose the nuclear structure of the H5N1 virus b. discover that the nucleus contained DNA but no proteins c. discover that human and mice chromosome chemistry differs greatly d. isolate DNA and propose its structure e. isolate and purify a cellular organelle
Adrenoleukodystrophy (ALD) is a recessive, X-linked disease resulting in defective enzymes attacking myelin in the nervous system. Which genetic predictions are possible for the offspring of a male with ALD and a female carrier of the disease?
Which of these does cellular respiration do?
A. releases energy and reduces water B. oxidizes glucose and reduces oxygen C. oxidizes oxygen and reduces glucose D. releases energy and oxygen E. requires energy and releases NADH
Garrod hypothesized that "inborn errors of metabolism" such as alkaptonuria occur because _____
A) metabolic enzymes require vitamin cofactors, and affected individuals have significant nutritional deficiencies B) enzymes are made of DNA, and affected individuals lack DNA polymerase C) certain metabolic reactions are carried out by ribozymes, and affected individuals lack key splicing factors D) genes dictate the production of specific enzymes, and affected individuals have genetic defects that cause them to lack certain enzymes