A fruit-bearing dioecious flower would have
A. a gynoecium.
B. both an androecium and a gynoecium.
C. neither an androecium nor a gynoecium.
D. an androecium.
Answer: A
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The ____ protists may cause dysentery after drinking contaminated water
amoeba
a. dinoflagellateb. apicomplexan c. amoeba d. ciliate e. water mold
The study of the genetic variability within a population and the forces that change allele frequencies is:
a. variation ecology. b. evolutionary genetics. c. population genetics. d. cytogenetics. e. allele genetics
Which of the following statements regarding lateral gene transfer is INCORRECT?
a) Lateral gene transfer increases the genetic variability of species. b) Lateral transfer makes it difficult to identify the boundaries of different bacterial species. c) With the exception of the endosymbiosis events that gave rise to mitochondria and chloroplasts, lateral gene transfer does not occur in eukaryotes. d) Lateral transfer can occur through the ability of some species to absorb naked DNA fragments from the environment. e) Lateral gene transfer is rarely mediated by viral infections.
A very large gene, such as DMD, may take hours to transcribe mainly because
a. RNA polymerase may have difficulty clearing the promoter. b. long mRNAs form secondary structures that interfere with transcription. c. RNA polymerase has time-consuming error correction activity. d. many histone octamers may need to be modified or disassembled. e. there may be multiple abortive attempts at transcription.