What is the primary role of Myostatin, a member of the TGF-beta family, in the context of organ growth?

Correct answer: It inhibits the growth and proliferation of myoblasts, thereby limiting muscle size.

Explanation

Myostatin is a secreted signal protein that acts as a negative regulator of muscle growth. It is produced by muscle tissue itself and functions in a feedback loop to limit the proliferation of muscle precursor cells (myoblasts), thereby controlling the final size of the muscle.

Other questions

Question 1

What are the three fundamental processes essential for animal development, starting from a single fertilized egg?

Question 2

During gastrulation, the embryo is transformed into a multilayered structure. Which germ layer is responsible for giving rise to the entire vascular system, including the heart, blood vessels, and blood cells?

Question 3

What is the term for the developmental process where a cell's potential narrows, leading it to a specific fate, such as becoming a liver cell but no longer a kidney cell?

Question 4

What is the primary source of the dramatic morphological differences observed between different classes of animals, such as vertebrates and insects?

Question 5

What is the phenomenon called where a signal molecule, diffusing from a localized source, creates a concentration gradient that directs cells at different distances to adopt different fates?

Question 6

In Drosophila embryogenesis, what is the role of the maternal-effect gene product Bicoid?

Question 7

What is the primary function of homeotic selector (Hox) genes in animal development?

Question 8

The arrangement of Hox genes on the chromosome exhibits a remarkable property known as colinearity. What does this mean?

Question 9

How do Polycomb and Trithorax group proteins contribute to developmental memory, particularly in relation to Hox gene expression?

Question 10

In the vertebrate embryo, the dorsoventral (D-V) axis is patterned by a competition between which two types of secreted signaling proteins?

Question 11

What is the function of the segmentation clock, which involves oscillating gene expression in the presomitic mesoderm of vertebrate embryos?

Question 12

What is the approximate cycle time of the segmentation clock in a chick embryo, which corresponds to the formation of one new pair of somites?

Question 13

In the nematode C. elegans, what type of molecules are encoded by the heterochronic genes Lin4 and Let7, which are crucial for controlling developmental timing?

Question 14

What is vernalization in plants?

Question 15

What is the morphogenetic process called where a population of cells rearranges by intercalating, causing the tissue to narrow along one axis and elongate along another?

Question 17

Which intracellular signaling pathway, primarily controlled by mechanical forces and cell architecture, is a key regulator of organ size by controlling cell proliferation and survival?

Question 18

What is the primary factor accounting for the vast difference in adult body mass between a mouse and a human?

Question 19

How do pentaploid salamanders maintain the same overall body size as diploid salamanders, despite having cells that are about five times larger?

Question 20

What is endoreplication?

Question 21

What is the key event that triggers the formation of the dorsoventral (D-V) axis in a Xenopus frog embryo?

Question 22

In the early Drosophila embryo, what is the consequence of its syncytial nature for cell-cell communication?

Question 23

In the hierarchy of Drosophila segmentation genes, which group acts first to establish coarse anterior-posterior subdivisions of the embryo?

Question 24

What is the typical phenotype of a Drosophila mutant for a pair-rule gene like Even-skipped?

Question 25

The Drosophila signaling proteins Wingless and Hedgehog are expressed in adjacent bands of cells within each segment. What is the nature of their interaction?

Question 26

What is the consequence of artificially expressing the master transcription regulator Eyeless (or its homolog Pax6) in the leg precursors of a Drosophila?

Question 27

How do C. elegans heterochronic mutants like those affecting Lin14 provide insight into developmental timing?

Question 28

How is the maternal-zygotic transition (MZT), the point where the embryonic genome takes over control of development, timed in many animal embryos?

Question 29

What is the primary mechanism that drives the bending of an epithelial sheet into a tube, such as during neural tube formation?

Question 30

How is cell migration often guided in the embryo, for example in the case of primordial germ cells moving toward the developing gonads?

Question 31

What is the role of Stem cell factor (SCF) and its receptor Kit in the development of neural crest cells?

Question 32

What does the phenomenon of planar cell polarity refer to?

Question 33

The evolution of pelvic spine loss in freshwater stickleback fish is a well-studied example of morphological change. What is the specific genetic basis for this change?

Question 34

How many Hox gene complexes are typically found in mice and humans?

Question 35

What happens in a Drosophila embryo if all the Hox genes are deleted?

Question 36

What is the function of the 'Organizer' in an amphibian embryo, as demonstrated by classic transplantation experiments?

Question 37

How does the negative feedback loop involving Hes genes generate the oscillations of the vertebrate segmentation clock?

Question 38

In Drosophila neuroblast development, what mechanism ensures that different types of neurons are produced in a stereotyped sequence over time?

Question 39

What is the primary role of the noncoding RNA 'Coolair' in the regulation of flowering in Arabidopsis?

Question 40

In the developing chick hindbrain, what mechanism prevents cells from adjacent rhombomeres from mixing?

Question 41

What is the primary role of growth hormone (GH) and insulin-like growth factor 1 (IGF1) in mammalian growth?

Question 42

What is the consequence of a gain-of-function mutation in the Ubx (Ultrabithorax) gene in the second thoracic segment of a Drosophila?

Question 43

What is the typical number of population doublings after which normal human fibroblasts enter replicative cell senescence when grown in culture?

Question 44

In the development of sensory bristles in Drosophila, what mechanism ensures that only a single sensory organ precursor cell is selected from a cluster of equivalent epidermal cells?

Question 45

How does the Numb protein contribute to creating different daughter cell fates during the asymmetric division of a Drosophila sensory organ precursor?

Question 46

What is the primary determinant of cell size in most organisms?

Question 47

How many germ layers are formed during gastrulation, and what are their names?

Question 48

What is the typical cell shape in a stable two-dimensional epithelial sheet, and what forces determine this arrangement?

Question 49

In branching morphogenesis, such as in the developing lung, what is the role of the signaling molecule FGF10?

Question 50

What is the typical lifespan of somatic cells in the worm C. elegans after they are generated?