BIOL 101 Ch.47 - Developmental
Biology Questions and Correct
Answers.
A _____ is a mass of undifferentiated cells with the ability to develop into an organ or body part.
- Answer blastema
A _____ is an undifferentiated cell that can be a source of differentiated cells. - Answer stem
cell
________ is an anatomical term that refers to a point situated close to the center of the body or
point of attachment. - Answer proximal
________ is the process by which some organisms replace lost or amputated body parts. -
Answer regeneration
_______ is an anatomical term that refers to a point situated away from the center of the body
or point of attachment. - Answer distal
________ is the increase in the number of cells due to cell growth and division via the cell cycle.
- Answer cell proliferation
Researchers wish to better understand miscarriage. Which length of pregnancy should they
focus on? - Answer a pregnancy of less than twelve weeks
Following an in-depth study, it is discovered that sitagliptin is effective in reducing the chance
for miscarriage. Which of the following is this working on? - Answer womb lining
Which of the following is true?
- No cause for miscarriage is known.
- About half of miscarriages are due to chromosomal abnormalities.
- The great majority of miscarriages occur due to chromosomal abnormalities.
- The large majority of miscarriages occur in pregnancies with healthy fetuses - Answer
About half of miscarriages are due to chromosomal abnormalities.
If current research proves correct, which of the following hormones is most likely to help
prevent miscarriage? - Answer progesterone
, Which of the following is true?
- A population with fewer women in poverty will have more stillbirths and miscarriages.
- A population with more women in poverty will have fewer stillbirths and miscarriages.
-A population with fewer women in poverty will have fewer stillbirths and miscarriages.
- Poverty levels of women do not affect the number of stillbirths and miscarriages. - Answer
A population with fewer women in poverty will have fewer stillbirths and miscarriages.
How were the researchers able to independently measure DNA synthesis and RNA synthesis? -
Answer Thymidine is a nucleoside building block for DNA, but not RNA, whereas uridine is a
nucleoside building block for RNA, but not DNA.
The cortical reaction of sea urchin eggs functions directly in - Answer the formation of a
fertilization envelope.
Among the following, the earliest consequence of the acrosomal reaction is __________. -
Answer depolarization of the egg plasma membrane
The uneven cleavage of cells early in the development of the yolk-rich embryos of birds is called
__________. - Answer meroblastic cleavage
Treating an oocyte with a chemical that binds calcium and magnesium ions will block ________.
- Answer formation of the fertilization envelope
In mammalian eggs, the receptors for sperm are found in which of the following locations? -
Answer plasma membrane
The formation of the fertilization envelope in a sea urchin egg is most directly stimulated by an
increase in the cytosolic concentration of which of the following ions? - Answer calcium ions
Contact between signaling molecules on a sperm membrane with receptor molecules on an
oocyte membrane will most directly result in which of the following responses? - Answer
membrane depolarization
In sea urchins, which of the following pairs of events most directly results in the short-lasting
"fast block" and the longer-lasting "slow block" to polyspermy, respectively? - Answer
membrane depolarization and the cortical reaction
Under which condition will the metabolic activity in a sea urchin egg most likely be activated
even in the absence of sperm? - Answer injection of calcium ions into the cytosol
Biology Questions and Correct
Answers.
A _____ is a mass of undifferentiated cells with the ability to develop into an organ or body part.
- Answer blastema
A _____ is an undifferentiated cell that can be a source of differentiated cells. - Answer stem
cell
________ is an anatomical term that refers to a point situated close to the center of the body or
point of attachment. - Answer proximal
________ is the process by which some organisms replace lost or amputated body parts. -
Answer regeneration
_______ is an anatomical term that refers to a point situated away from the center of the body
or point of attachment. - Answer distal
________ is the increase in the number of cells due to cell growth and division via the cell cycle.
- Answer cell proliferation
Researchers wish to better understand miscarriage. Which length of pregnancy should they
focus on? - Answer a pregnancy of less than twelve weeks
Following an in-depth study, it is discovered that sitagliptin is effective in reducing the chance
for miscarriage. Which of the following is this working on? - Answer womb lining
Which of the following is true?
- No cause for miscarriage is known.
- About half of miscarriages are due to chromosomal abnormalities.
- The great majority of miscarriages occur due to chromosomal abnormalities.
- The large majority of miscarriages occur in pregnancies with healthy fetuses - Answer
About half of miscarriages are due to chromosomal abnormalities.
If current research proves correct, which of the following hormones is most likely to help
prevent miscarriage? - Answer progesterone
, Which of the following is true?
- A population with fewer women in poverty will have more stillbirths and miscarriages.
- A population with more women in poverty will have fewer stillbirths and miscarriages.
-A population with fewer women in poverty will have fewer stillbirths and miscarriages.
- Poverty levels of women do not affect the number of stillbirths and miscarriages. - Answer
A population with fewer women in poverty will have fewer stillbirths and miscarriages.
How were the researchers able to independently measure DNA synthesis and RNA synthesis? -
Answer Thymidine is a nucleoside building block for DNA, but not RNA, whereas uridine is a
nucleoside building block for RNA, but not DNA.
The cortical reaction of sea urchin eggs functions directly in - Answer the formation of a
fertilization envelope.
Among the following, the earliest consequence of the acrosomal reaction is __________. -
Answer depolarization of the egg plasma membrane
The uneven cleavage of cells early in the development of the yolk-rich embryos of birds is called
__________. - Answer meroblastic cleavage
Treating an oocyte with a chemical that binds calcium and magnesium ions will block ________.
- Answer formation of the fertilization envelope
In mammalian eggs, the receptors for sperm are found in which of the following locations? -
Answer plasma membrane
The formation of the fertilization envelope in a sea urchin egg is most directly stimulated by an
increase in the cytosolic concentration of which of the following ions? - Answer calcium ions
Contact between signaling molecules on a sperm membrane with receptor molecules on an
oocyte membrane will most directly result in which of the following responses? - Answer
membrane depolarization
In sea urchins, which of the following pairs of events most directly results in the short-lasting
"fast block" and the longer-lasting "slow block" to polyspermy, respectively? - Answer
membrane depolarization and the cortical reaction
Under which condition will the metabolic activity in a sea urchin egg most likely be activated
even in the absence of sperm? - Answer injection of calcium ions into the cytosol
