Genetics and Developmental Biology

6 years ago

Given the relative positions of the three embryonic germ layers in the gastrula, which of these ...

Given the relative positions of the three embryonic germ layers in the gastrula, which of these layers contributes to the formation of the gut?
A) mesoderm
B) ectoderm
C) endoderm
D) All three layers contribute equally to formatio

dracko 78 1 Reply

6 years ago

When a somite matures, the fact that it will become a specific cell type is referred to as which of ...

When a somite matures, the fact that it will become a specific cell type is referred to as which of the following?
A) cell specification
B) cell determination
C) cell differentiation
D) cell gastrulation

Dugg 49 1 Reply

6 years ago

Refer to the figure above to answer this question. You are a researcher studying animal development ...

Refer to the figure above to answer this question. You are a researcher studying animal development in salamanders. You remove cells from the area facing away from the neural tube and transplant them to the area of the somite next to the neural tube.

pkclary 74 1 Reply

6 years ago

One unique feature of fertilization in flowering plants compared with animals is that:

One unique feature of fertilization in flowering plants compared with animals is that
A) plant sperm are motile.
B) multiple ovules exist in the ovary.
C) the process involves double fertilization.
D) nuclear fusion does not take

pkclary 83 1 Reply

6 years ago

All of the following statements are true of the endosperm EXCEPT that:

All of the following statements are true of the endosperm EXCEPT that
A) it may be likened to the yolk of an animal egg.
B) it is a triploid tissue.
C) it is used as a food source by the embryo.
D) it is formed from equal contrib

Dugg 63 1 Reply

6 years ago

Of the following developmental processes, which is not undergone by plant embryos?

Of the following developmental processes, which is not undergone by plant embryos?
A) fertilization
B) cleavage
C) embryogenesis
D) gastrulation
E) organogenesis

pkclary 76 1 Reply

6 years ago

Many flowering plant species have elaborate mechanisms to prevent an individual's pollen from ...

Many flowering plant species have elaborate mechanisms to prevent an individual's pollen from fertilizing its own egg cells. Why?
A) to prevent inbreeding
B) to prevent polyspermy
C) to prevent cross-species fertilization and the

pkclary 84 1 Reply

6 years ago

Interactions between proteins on the surface of the pollen grain and on the surface of the stigma ...

Interactions between proteins on the surface of the pollen grain and on the surface of the stigma are necessary for fertilization to proceed. What is the correct sequence of events that follow this interaction?
A) growth of pollen tube, double f

dracko 64 1 Reply

6 years ago

In flowering plants, an event known as double fertilization occurs when:

In flowering plants, an event known as double fertilization occurs when
A) two sperm enter the ovule; one fertilizes the egg, and the other fertilizes a 2n cell to generate endosperm.
B) two sperm cells fertilize one normal egg cell to mak

pkclary 88 1 Reply

6 years ago

Plant embryos cannot undergo gastrulation. What ensures the correct positioning of cells during ...

Plant embryos cannot undergo gastrulation. What ensures the correct positioning of cells during plant embryogenesis?
A) cell movements inside the seed coat
B) genetic differences among the cells
C) cytoplasmic determinants in the cells

dracko 68 1 Reply

6 years ago

The monopterous gene in Arabidopsis encodes a protein that is similar in its function to which ...

The monopterous gene in Arabidopsis encodes a protein that is similar in its function to which animal protein?
A) MyoD in frog embryos
B) Bicoid in fruit-fly embryos
C) keratin in human embryos

ceybe 83 1 Reply

6 years ago

In the early plant embryo, cells divide asymmetrically. Which structure does NOT result from ...

In the early plant embryo, cells divide asymmetrically. Which structure does NOT result from divisions of the apical cell?
A) the suspensor
B) the cotyledons
C) the hypocotyls
D) the shoot

ceybe 54 1 Reply

6 years ago

The auxin produced in Arabidopsis embryos and Bicoid protein produced in Drosophila embryos have ...

The auxin produced in Arabidopsis embryos and Bicoid protein produced in Drosophila embryos have what similar function?
A) Both are regulatory transcription factors that serve as cell-to-cell signals.
B) Both are cytoplasmic determinants—th

Dugg 212 1 Reply

6 years ago

The basal cell in a plant embryo:

The basal cell in a plant embryo
A) develops from the root of the embryo.
B) forms the suspensor that anchors the embryo.
C) differentiates after gastrulation.
D) divides to form cotyledons.
E) divides to form hypocotyls.

Dugg 86 1 Reply

6 years ago

If the expression of the PHAN gene is blocked in plants, what will be the likely result?

If the expression of the PHAN gene is blocked in plants, what will be the likely result?
A) Plants will fail to develop leaves.
B) Plants will develop more leaves than usual.
C) Plants will develop leaves in very simple shapes.
D)

Dugg 44 1 Reply

6 years ago

The floral meristem in flowering plants develops from the shoot apical meristem, which usually ...

The floral meristem in flowering plants develops from the shoot apical meristem, which usually produces leaves. Which floral part is not a modified leaf?
A) sepal
B) carpel
C) stamen
D) receptacle
E) petal

pkclary 157 1 Reply

6 years ago

The ABC model of flower development suggests that:

The ABC model of flower development suggests that
A) each of the three genes codes for the formation of a different flower organ.
B) genes may work alone or together to form different flower organs.
C) inactivation of genes may transf

Dugg 43 1 Reply

6 years ago

The ABC genes in Arabidopsis are considered homeotic genes. What could be a reason for this ...

The ABC genes in Arabidopsis are considered homeotic genes. What could be a reason for this classification?
A) Each of the three genes codes for a different flower organ.
B) Each gene codes for regulatory transcription factors.
C) Each

pkclary 64 1 Reply

6 years ago

What does the ABC model of flower development attempt to explain?

What does the ABC model of flower development attempt to explain?
A) how different combinations of gene products trigger the formation of different floral organs
B) why petals are found on the inside of the whorl of sepals instead of on the

pkclary 71 1 Reply

6 years ago

Yolk and endosperm share a number of functions. Which of the following does NOT describe a ...

Yolk and endosperm share a number of functions. Which of the following does NOT describe a similarity between them?
A) Yolk and endosperm both provide nutrition for embryos.
B) Yolk and endosperm both contain proteins.
C) Yolk and endo

ceybe 37 1 Reply

6 years ago

Plant and animal development share a number of features, but differ in major ways as well. Which of ...

Plant and animal development share a number of features, but differ in major ways as well. Which of the following best summarizes the similarities between the two forms of development?
A) Both plants and animals develop from a process of single

dracko 64 1 Reply

6 years ago

Plant and animal development share a number of features, but differ in major ways as well. Which of ...

Plant and animal development share a number of features, but differ in major ways as well. Which of the following best summarizes the differences between the two forms of development?
A) Animal tissues are irreversibly differentiated; plant tiss

dracko 54 1 Reply

6 years ago

How does the interaction between pollen and stigma in flowering plants compare to the interaction ...

How does the interaction between pollen and stigma in flowering plants compare to the interaction between bindin and its egg-cell receptor in sea urchins?
A) The specificity between these interactions prevents fertilization from occurring betwee

Dugg 60 1 Reply

6 years ago

If auxin was not present in a developing plant cell, which of the following would most likely ...

If auxin was not present in a developing plant cell, which of the following would most likely occur?
A) It would trigger activation of MONOPTEROS and other regulatory factors specific to cells in the developing hypocotyls.
B) It would trigg

ceybe 54 1 Reply

6 years ago

Which of the following would be attributed to a lack of meristems?

Which of the following would be attributed to a lack of meristems?
A) MONOPTEROS would no longer be activated leading to underdeveloped hypocotyls.
B) The roots and shoots would only respond to certain environmental cues (i.e. a lack of wat

Dugg 57 1 Reply

6 years ago

What effect does PHANTASTICA have on plant development?

What effect does PHANTASTICA have on plant development?
A) It induces leaf growth within a shoot apical meristem.
B) It triggers transcription factors specific to the developing hypocotyl.
C) It triggers the expression of genes that ca

Dugg 59 1 Reply

6 years ago

In their study of the Madagascar lace plant, how did the researchers establish that the holes were ...

In their study of the Madagascar lace plant, how did the researchers establish that the holes were formed through programmed cell death?
A) They tested for apoptosis using the TUNEL assay.
B) They found suberin around the margins of the hol

Dugg 49 1 Reply

6 years ago

Which of the following would be a logical hypothesis for advantage(s) to holes in the leaves of the ...

Which of the following would be a logical hypothesis for advantage(s) to holes in the leaves of the Madagascar lace plant?
A) Holes in the leaves allow increased surface area for herbivores.
B) Holes in the leaves make it harder for competi

pkclary 32 1 Reply

6 years ago

On the figure above, which of the letters represents the radial axis?

On the figure above, which of the letters represents the radial axis?
A) A
B) B
C) C

Dugg 42 1 Reply

6 years ago

On the figure above, which of the letters represents the apical axis?

On the figure above, which of the letters represents the apical axis?
A) A
B) B
C) C

dracko 51 1 Reply

6 years ago

How do plants cope with the considerable variation in their environment?

How do plants cope with the considerable variation in their environment?
A) Plants continually grow and take in cues from their environment, which alter their growth patterns in specific directions.
B) Plants have reproductive meristems t

pkclary 63 1 Reply

6 years ago

Please refer to the elm tree shown in the figure above. What would be the likely phenotype of an elm ...

Please refer to the elm tree shown in the figure above. What would be the likely phenotype of an elm that has the same genotype but grows in a forest?
A) Both elms have the same genotype and thus would look exactly the same as the one in the fi

ceybe 61 1 Reply

6 years ago

Why was Darwin and Wallace's theory of evolution by natural selection revolutionary?

Why was Darwin and Wallace's theory of evolution by natural selection revolutionary?
A) It implied that England's economy would improve if the monarchy were eliminated.
B) It proved that individuals acclimated to their environment

dracko 83 1 Reply

6 years ago

Who proposed that organisms could be organized into a great chain of being?

Who proposed that organisms could be organized into a great chain of being?
A) Aristotle
B) Lamarck
C) Linnaeus
D) Darwin
E) Wallace

Dugg 50 1 Reply

6 years ago

Which of the following statements is an example of typological thinking?

Which of the following statements is an example of typological thinking?
A) The variety of dog shape and size is truly amazing.
B) Women are shorter than men, have longer hair, and like to shop.
C) It is best to choose the seeds from t

dracko 43 1 Reply

6 years ago

Which of the following scientists argued that variation among individuals allows evolution to ...

Which of the following scientists argued that variation among individuals allows evolution to occur?
A) Aristotle
B) Lamarck
C) Linnaeus
D) Wallace

Dugg 63 1 Reply

6 years ago

Researchers have found fossils of Eocene horse species in Colorado. Deeper deposits contain smaller ...

Researchers have found fossils of Eocene horse species in Colorado. Deeper deposits contain smaller species, and more recent deposits contain larger species. How does this observation support the theory of evolution?
A) It suggests that species

Dugg 134 1 Reply

6 years ago

Whether species change over time and (2)whether they are related by common ancestry. 6) Radiometric ...

whether species change over time and (2)whether they are related by common ancestry.

6) Radiometric dating is a technique used to determine the age of rocks. Geologists have used this technique to determine that
A) Earth is about 6.

pkclary 46 1 Reply

6 years ago

Many crustaceans (e.g., lobsters, shrimp, and crayfish) use their tails to swim, but crabs have ...

Many crustaceans (e.g., lobsters, shrimp, and crayfish) use their tails to swim, but crabs have reduced tails that curl under their shells and are not used in swimming. This is an example of
A) artificial selection.
B) an extinction.

dracko 82 1 Reply