Which of the following is most likely to increase the risks of ASD?
A) exposure to environmental chemicals during pregnancy
B) vaccination with the MMR vaccine
C) poor parenting
D) all of the above
Answer: A
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Which of the following is not true about ferns?
a. their gametophytes and sporophytes are both photosynthetic b. their sporophytes are much smaller than the gametophytes c. their underground stem is called a rhizome d. their leaves are called fronds e. clustered, stalked sporangia called sori arise on the backs of the fronds
Which statement best describes polyribosomes?
A) They are only found in archaea. B) They can occur in archaea, bacteria, and eukaryotes during transcription. C) They can only form after RNA has left the nucleus in eukaryotes, but are found in all domains. D) They can only form in eukaryotes, not in other organisms, and can only form once the RNA has been fully processed.
The medical procedures used to prevent microbial contamination are called:
A. Bioremediation B. Disinfection C. Sterilization D. Aseptic techniques
Which statement about lampbrush chromosomes is incorrect?
A) Looped out regions are active in RNA synthesis. B) The loops consist of two DNA helices, whereas the axis consists of a single DNA helix. C) They are meiotic chromosomes. D) More DNA is looped out from the axis than is required for a single gene. E) Instead of being condensed, they are extended.