A microbiologist explains to one of her biology classes that her research focuses on the nucleoid region of the cholera bacteria. This means that she is studying a region within the bacterium that contains the
A. nucleic acids.
B. nuclear membrane.
C. R plasmids.
D. peptidoglycan.
A. nucleic acids.
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In your fly laboratory, you find a larva that is missing segments Lb, T1, T2, and T3. This larva probably has a mutation in a ___________ gene.
A. pair-rule B. gap C. maternal effect D. segment-polarity E. gap or segment-polarity
The early evolution of higher apes and early ancestors of modern humans most closely resembles
A. two streams, Australopithecus and Homo, that merge into one lineage leading to humans. B. a straight-line vine with one main trunk and many unsuccessful short branches, with only one or two forms coexisting at any one time. C. a many-branched tree with all modern forms extending back relatively unchanged until reaching the common "missing link" at an origin about 33 million years ago. D. two main trunks leading to apes or humans, and where each newly advanced species of Homo immediately eliminated any coexisting hominids. E. a complex bush with many branches and perhaps as many as ten species of hominins 2 million years ago.
Why can't plants use N2 directly as a nutrient?
A) The N2 molecule is too large to enter the stomata. B) Most soils are depleted of N2 as a nutrient. C) N2 diffuses out of leaves as quickly as it diffuses in, so it has to be "fixed" to remain in leaves. D) Plants lack the enzymes necessary to convert N2 into NO3?or NH4+. E) Plants must use NO3? to carry out nitrogen fixation.
The Xist gene product
A. is required for the production of Barr bodies. B. is never translated into protein. C. associates with proteins to compact the chromosome. D. coats the X chromosome with RNA. E. All of these statements are correct.