Which statement regarding spermatogenesis and oogenesis is true?
A) Meiosis in spermatogenesis produces two cells from one primary spermatocyte.
B) Meiosis in oogenesis produces one mature egg from one primary oocyte.
C) Spermatogenesis begins at birth.
Answer: B
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Water that moves through nonliving regions of root, such as air spaces in root tissue, is following the ____
a. symplastic pathway only b. transmembrane and symplastic pathways c. transmembrane pathway only d. apoplastic, transmembrane, and symplastic pathways e. apoplastic pathway only
Plant adaptations to life on land
a. involve mainly the shoot system. b. include lignin-reinforced cell walls. c. include pipelines that conduct water from soil to leaves. d. involve only the root system. e. include lignin-reinforced cell walls and pipelines that conduct water from soil to leaves.
Which of the following virus structures contain the receptor sites that allow it to attach to specific sites on a cell?
a) capsule b) cell wall c) plasma membrane d) envelope e) nucleic acid core
The effects of a transposition event are equivalent to a(n)
A) nonsense mutation. B) missense mutation. C) frameshift mutation. D) silent mutation. E) HFR conjugation.