Cell walls are found in ____
a. animal cells only
b. plant cells only
c. fungal cells only
d. plant and fungal cells
e. animal and plant cells
ANSWER: d
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If a pollen grain lands on the stigma of a plant that is not related to that plant then the following would happen:
A. The pollen grain would be too large or too small to enter the stigma. B. The pollen would likely not attach to the stigma. C. The pollen grain would be unable to grow through the stigma. D. The pollen grain would be unable to form sperm nuclei. E. The pollen grain would be ejected from the stigma.
The ascending portion of the loop of Henle is
A. permeable to water and impermeable to sodium. B. permeable to water and permeable to sodium. C. impermeable to water and permeable to sodium. D. impermeable to water and impermeable to sodium. E. the site of active transport of water.
Which of the following may provide clues to the
evolution of sexual reproduction? a. similarities between mitosis and meiosis at the cellular level b. similarities between mitosis and meiosis at the molecular level c. gene products common to mitosis and meiosis that repair DNA d. gene products produced by an asexually reproducing species that are identical to those that serve in meiosis e. all of these
RNA transcription takes place in the
A) mitochondria B) cytoplasm C) endoplasmic reticulum D) nucleus