Which of the following is true with regard to the carbon cycle? (Select all that apply.)
A. Animals are always sinks for CO2.
B. Plants are always sinks for CO2.
C. Cellular respiration releases CO2 into the
environment.
D. Photosynthesis removes CO2 from the
environment.
E. Plants are permanent sinks for CO2.
F. Fossil fuels are stores of CO2.
G. The ocean is both a source and a sink of
CO2.
H. Humans only contribute to the carbon
cycle by the burning of fossil fuels.
C,D,F
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Consider the phylogenetic tree shown above. Geographic labels indicate the origin of humans sampled for mtDNA sequence analysis. Chimp is the outgroup. Which of the following statements is correct?
A. The tree supports the "out of Africa hypothesis" for the origin humans because it implies that the common ancestor of all the humans is of African origin. B. The tree does not reveal anything about the geographic original of humans. C. The tree supports the multi-regional hypothesis because there are four independent populations. D. The closest relative to the Kenyans are the English. E. The Chinese share a more recent common ancestor with the Ethiopians than the Kenyans.
Which sequence of events CORRECTLY describes the initiation and elongation steps of translation in prokaryotic cells?
(1) initiator tRNA binds start codon on mRNA (2) small ribosomal subunit binds to mRNA (3) large ribosomal subunit binds (4) tRNA entry and peptidyl transfer reaction (5) translocation of ribosome and release of tRNA A. 1, 2, 3, 4, 5 B. 1, 2, 3, 5, 4 C. 1, 3, 2, 4, 5 D. 2, 3, 1, 5, 4 E. 2, 1, 3, 4, 5
Which of the following animals undergoes true holoblastic cleavage?
A. butterfly B. ant C. snail D. tuna E. bird
There are no microorganisms that can cross the transplacental barrier, so fetuses are protected until birth.
a. true b. false