What cell is haploid?
A. oogonium
B. zygote
C. primary oocyte
D. ovum
E. spermatogonium
D. ovum
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A recombinant DNA was constructed by inserting the DNA of interest into the AmpR gene of a pBR322 vector. The vector also contains a TetR gene that is not interrupted
After introducing the recombinant DNA into bacterial cells, the resulting transformants were tested on a variety of media. Which of the following results would be expected? A. growth on both ampicillin containing media and tetracycline containing media B. growth on ampicillin but not tetracycline containing media C. growth on tetracycline but not ampicillin containing media D. no growth on either ampicillin or tetracycline containing media E. growth only on media containing both antibiotics
Large numbers of ribosomes are present in cells that produce which of the following molecules?
A. steroids B. lipids C. glucose D. starches E. proteins
Mutations may arise by replication error, __________ activity, or exposure to environmental hazards. Fill in the blank(s) with the appropriate word(s)
Species whose ranges overlap, but do not interbreed because they are found in different environments
or areas within the range, are said to exhibit:a. environmental isolation. b. biological isolation. c. evolutionary isolation. d. habitat isolation. e. temporal isolation