Although containing a full set of chromosomes, secondary spermatocytes are considered haploid because _____.
A) the human diploid number is 92
B) meiosis I separates the homologous chromosomes from one another
C) crossing over has already occurred
D) the duplicated chromosomes exist as sister chromatids
Answer: B) meiosis I separates the homologous chromosomes from one another
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The initial experiment of Koga and Fugatsu, in testing for any bacterial cause of aphid color change, involved all of these except
A. the specific amounts of red and green pigment molecules were initially measured as dependent variables. B. a group of green aphids was grown, then killed in order to produce an extract to test on red aphids. C. a group of red aphids was treated with the independent variable of Rickettsiella bacteria infection from green aphids. D. a group of red aphids was grown as a control group. E. a group of aphids infected with Rickettsiella bacteria was grown, then killed in order to produce an extract to test on red aphids.
A mass extinction, in which the dinosaurs disappeared from Earth, occurred approximately ____ years ago
a. 6500 b. 65,000 c. 650,000
d. 65,000,000 e. 650,000,000
The building blocks of nucleic acids are
a. amino acids. b. nucleotides. c. pentose sugars. d. phosphate groups. e. nitrogenous bases.
Which of the following occurs first during an action
potential? a. Many sodium ions flow into the neuron. b. Voltage-gated sodium channels open. c. A local disturbance triggers the resting voltage to reach the threshold level. d. The interior of the neuron becomes positive. e. The interior of the neuron becomes negative.