Exam 7: Animal Growth and Development

In this figure, what process occurs at step A?

Which stage of the cell cycle covers most of the life span of a cell?

During which stage of the cell cycle does DNA replication occur?

A pesticide targets the endodermal layer in developing mosquitoes. Based on this, which of the following will likely not develop correctly?

Which of the following molecules is made up of codons?

Caenorhabditis elegans is a nematode with an adult body length of approximately 1 mm. It is a free-living organism that lives in temperate soil environments. It has played a major role as a model organism for research into molecular and developmental biology. This nematode lives for about 2-3 weeks and passes through four juvenile stages before reaching sexual maturity. It has six chromosomes and a transparent body that facilitates the study of cell differentiation and development. C. elegans has been used extensively in the study of aging. In these studies, scientists have discovered a gene called daf-2, which plays a significant role in controlling the aging process and longevity. In fertile nematodes where there is a mutation in the daf-2 gene, animals lived for almost twice as long as animals with the normal gene. The daf-2 gene produces molecules that play an important role in cell signaling pathways associated with growth and aging of individual cells. Reducing the activity of these molecules extends the life span of the whole animal. If one strand of a sister chromatid from C. elegans has nine different genes, which of the following is true about the second strand of the sister chromatid?

Based on this graph, does this organism exhibit determinate or indeterminate growth?

The changes in body shape associated with this figure are an example of __________.

Caenorhabditis elegans is a nematode with an adult body length of approximately 1 mm. It is a free-living organism that lives in temperate soil environments. It has played a major role as a model organism for research into molecular and developmental biology. This nematode lives for about 2-3 weeks and passes through four juvenile stages before reaching sexual maturity. It has six chromosomes and a transparent body that facilitates the study of cell differentiation and development. C. elegans has been used extensively in the study of aging. In these studies, scientists have discovered a gene called daf-2, which plays a significant role in controlling the aging process and longevity. In fertile nematodes where there is a mutation in the daf-2 gene, animals lived for almost twice as long as animals with the normal gene. The daf-2 gene produces molecules that play an important role in cell signaling pathways associated with growth and aging of individual cells. Reducing the activity of these molecules extends the life span of the whole animal. If a cell of C. elegans is preparing for division but fails the G₂ checkpoint, which of the following is likely to occur?

The following represents a portion of one half of a DNA strand: TCGAAGTC. Which of the following represents a single mutation in this portion of DNA?

The following represents a portion of one half of a DNA strand: ATTCG. What would be the complementary sequence to this?

Caenorhabditis elegans is a nematode with an adult body length of approximately 1 mm. It is a free-living organism that lives in temperate soil environments. It has played a major role as a model organism for research into molecular and developmental biology. This nematode lives for about 2-3 weeks and passes through four juvenile stages before reaching sexual maturity. It has six chromosomes and a transparent body that facilitates the study of cell differentiation and development. C. elegans has been used extensively in the study of aging. In these studies, scientists have discovered a gene called daf-2, which plays a significant role in controlling the aging process and longevity. In fertile nematodes where there is a mutation in the daf-2 gene, animals lived for almost twice as long as animals with the normal gene. The daf-2 gene produces molecules that play an important role in cell signaling pathways associated with growth and aging of individual cells. Reducing the activity of these molecules extends the life span of the whole animal. Which of the following is not true about nematodes such as C. elegans ?

All of the following are germ layers EXCEPT

A nucleotide is the building block of what macromolecule?

The cell stage that occurs immediately after (A) is the __________.

Which of the following would not be found in a vial containing DNA?

Changes in shape as an animal grows from egg to adult are called __________.

Which of the following must be present for a cell to enter mitosis?

The following is a portion of one half of a DNA strand: CGGATAACGT. If this strand undergoes transcription and translation, the end result is

Which of the following lists the stages of embryonic development in the correct order following fertilization?