Which statement related to gymnosperm reproduction is true?
A. Many gymnosperms rely on insects for pollination.
B. Gymnosperms, like ferns, alternate generations.
C. Gymnosperm reproduction is so inefficient that gymnosperms do not grow very tall or live for very long.
D. Spores produce pollen grains, which contain sperm.
Answer: D
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The classic study of Washburn and Cannon was the perfect collaboration: Cannon had the ideas, and Washburn could swallow a(n) ___________.
What will be an ideal response?
Microarrays are created by robotically placing DNA on to a microscope slide and probing with
A. STSs from the tissue of interest. B. RNA from the tissue of interest. C. clone-by-clone sequencing. D. another DNA from the tissue of interest. E. SNPs from the tissue of interest.
Which of these diseases cannot be prevented by toxoids?
A) botulism B) gram-negative septic shock C) diphtheria D) tetanus
Investigators performed nuclear transplant experiments to determine whether DNA is altered irreversibly during development. Which of the following statements about these experiments is true?
(a) Because the donor nucleus is taken from an adult animal, the chromosomes from the nucleus must undergo recombination with the DNA in the egg for successful development to occur. (b) The embryo that develops from the nuclear transplant experiment is genetically identical to the donor of the nucleus. (c) The meiotic spindle of the egg must interact with the chromosomes of the injected nuclei for successful nuclear transplantation to occur. (d) Although nuclear transplantation has been successful in producing embryos in some mammals with the use of foster mothers, evidence of DNA alterations during differentiation has not been obtained for plants.