Secondary spermatocytes are produced in the first meiotic division
____________________ Indicate whether the statement is true or false.
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Studies of rapidly dividing embryonic animal cells revealed:
A. a cyclic production of certain proteins in sync with the cell cycle. B. a cyclic activation of protein kinases in sync with the cell cycle. C. the rapid production of cyclin proteins is trailed by an activation of CDK enzymes. D. inhibition of protein production blocks mitosis. E. All of these choices are correct.
Approximately _____ percent of the Earth’s water is salt water
a. 3 b. 50 c. 65 d. 98
A cool, damp, north-facing slope is covered with ferns, whereas an adjacent drier south-facing slope has none. What type of distribution pattern is this?
a. random b. near uniform c. clumped d. concentrated e. isolated
In the noncyclic pathway,
a. there is a one-way flow of electrons from photosystem I to photosystem II. b. ATP alone is produced. c. hydrogen ions are pumped into the thylakoid compartment. d. NADP+ accepts only H+. e. H+ accumulates in the stroma.