Which cells are most important in initiating the production of bicoid protein?
A) posterior portion cells B) neural tube cells
C) nurse cells D) limb bud cells
Answer: C
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In your observations of a new rotifer species, you note that diploid females can lay diploid eggs that in turn become diploid female adults. What do you conclude about this behavior?
A. This is asexual reproduction by way of parthenogenesis. B. This asexual reproduction by way of budding of a new individual from the parent. C. This is sexual reproduction by way of parthenogenesis. D. This is sexual reproduction because sperm must have been stored in the female for later fertilization of her eggs. E. This is sexual reproduction by way of diploid females laying haploid eggs that hatch into haploid males who in turn produce sperm that fertilizes other haploid eggs.
The phylum ____ consists of about 200 known species of nonvascular plants that produce hornlike sporophytes, and
are the only land plants whose chloroplasts contain alga-like protein bodies called pyrenoids.
a. Hepatophyta b. Monilophyta c. Bryophyta d. Lycophyta e. Anthocerophyta
The last part of the metamorphosis of a tadpole to an adult frog results in the disappearance of the tail. This stage of development most likely occurs by
(A) cells of the tail dying and the nutrients being absorbed and reused by the body (B) shedding of the tail so energy is not spent on maintenance of an unneeded part (C) bilateral division of the tail and fusion with the developing hind limbs (D) individual cells of the tail migrating to the developing gonads
Which gammaproteobacteria are facultatively anaerobic, gram-negative rods that inhabit the intestinal tracts of humans and other animals?
a. Pseudomonadales b. Vibrionales c. Enterobacteriales d. Legionellales