Which scientists showed that plants need light to grow?
a) van Helmont and Calvin.
b) Priestley and Ingenhousz.
c) van Helmont and Priestley.
d) Priestley and Calvin.
Answer: b) Priestley and Ingenhousz.
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If the duration of life on Earth was on a comparative scale of 20,000 days, for how many of those days would the human species be present?
A. 1 B. 100 C. 2000 D. 10,000 E. 20,000
A quadrat is usually used to measure density in mobile populations of animals
Indicate whether the statement is true or false
During mitosis and meiosis, many of the cellular processes are similar. What differences can be seen between prophase in mitosis and prophase I in meiosis?
A) During meiosis, but not mitosis, the homologous chromosomes pair together in tetrads. B) During meiosis, but not mitosis, the chromosomes are quadrupled prior to division. C) There are no differences between mitosis and meiosis at these stages. D) During mitosis, but not meiosis, the homologous chromosomes pair up
Mendel crossed true-breeding pea plants and found the dominant trait always appeared in the F1 generation, but it appeared in a ________ ratio of dominant to recessive in the F2 generation
A) 1:2 B) 1:1 C) 3:1 D) 1:3