Which of the following is an assumption of the lifespan perspective? a. Development is largely the result of heredity b. Development is primarily characterized by declines in functioning c. Development is a joint expression of growth and decline d. Plasticity is limited to early childhood

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Tod ThielLv2

12 Mar 2018

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You are interested in wing development in Drosophila. Youâve isolated a loss-of-function temperature-sensitive allele you name ubxts. It is an allele of the Ubx hox gene, which normally promotes hindwing development and represses forewing formation. Which of the following will result in adult flies with an additional pair of forewings where the hindwings normally are: a) homozygous ubxts /ubxts fly embryos grown at the restrictive temperature during development b)homozygous ubxts/ubxts fly embryos grown at the permissive temperature during development c) homozygous ubxts/ubxts flies that were grown at the permissive temperature during development and then shifted to the restrictive temperature in adulthood d) none of the above, a homozygous ubxts/ubxts will die early in development

1. Which of the following is generally a passive process?

a. Inhalation c. Gas exchange

b. Exhalation d. All of the above

2. All living things on earth are characterized by cellular organization, growth reproduction, and heredity. These

characteristics serve to define the term âlifeâ. Other properties commonly exhibited by organisms include movement and

sensitivity to stimuli. Which of the following conditions is a sufficient criterion to define life?

a. reproduction c. sensitivity

b. growth d. All of these

3. Cilia which are hair-like processes found on free surfaces of

certain cells originate from:

a. endoplasmic reticulum c. microtubules

b. centrioles d. cell membrane

Please reword/ rephrase the following in one paragraph thank you

Leaves are determinate structures whose primary function is to produce carbohydrates required for plant growth and development. From a developmental standpoint, leaves are interesting because they display a wide range of genetically and developmentally regulated variation in shape, and because their morphological simplicity and accessibility make them an ideal system for the analysis of basic problems in plant development. Growth control, pattern formation, and cell and tissue differentiation can all be conveniently studied in the context of leaf development. Although many of these problems have yet to be addressed in Arabidopsis, this situation is changing rapidly. This is due in part to the advantages of Arabidopsis for genetic and molecular analysis, but the relatively small size of the Arabidopsis leaf is an equally important advantage of this species because it permits microscopic analysis of an entire leaf at all stages of development.

Like most plants, Arabidopsis exhibits subtle heteroblasty (first described by RÃ¶bbelen 1957), in that leaves produced at different stages of shoot development vary in their morphology (Fig. 1). At a gross level, there are two distinct leaf types: rosette leaves and bracts. Rosette leaves are produced early in development and have long petioles and broad blades. Bracts (sometimes referred to as cauline leaves) form at the basal nodes of each branch in the inflorescence and differ from rosette leaves in that they lack petioles and have narrower, more oblong blades.