Replication of DNA produces
a. RNA molecules.
b. only new DNA.
c. two DNA strands that are both copies of the parent strand.
d. one completely new DNA strand and the old parent strand is degraded.
e. new proteins.
c
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When does the synaptonemal complex disappear?
A) late prophase of meiosis I B) during fertilization or fusion of gametes C) early anaphase of meiosis I D) mid-prophase of meiosis II E) late metaphase of meiosis II
Which one of the following cell types is found only in flowering plants?
A. vessels B. tracheids C. parenchyma D. sieve tubes E. epidermis
A core sample is taken 100 km west of and parallel to a ridge system. Magnetic readings of the rock show a reversal of the Earth's magnetic field. How many km east of the ridge system must scientists travel to collect a core sample with the same magnetic properties?
a. 50 b. 100 c. 200 d. 0 km; collect the sample directly at the ridge
Which statement is true of plasma membranes?
a. They have molecules on their surfaces that identify them. b. They are essentially impermeable. c. They are basically static, non-changing structures. d. They are hydrophilic barriers between cells. e. They function primarily through the activity of their carbohydrates.