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Displaying 451-460 of 854 results.
What happens to the embryo after week 8?
Select one:
All organ formation has completed, so the fetus begins to grow in size through mitosis.
Tissue and organ differentiation from the endoderm and mesoderm finalize at the end of the second trimester.
. Umbilical cord and placenta begins to form.
All other organs such as kidneys, bladder, liver, lungs, and spleen begin to form.
 
Between 1959 and 1961, thalidomide was prescribed to expectant mothers in Canada for morning sickness. Once it was determined that thalidomide was linked to miscarriages and birth defects, it was pulled from Canadian pharmacies in 1962. It is estimated that over 20 000 individuals worldwide were affected by thalidomide. There are approximately 100 thalidomide survivors in Canada who have been approved to receive compensation from the federal government. Which of the following over the counter and prescription medications have not been linked with birth defects or problems with pregnancy? (Some research may be required.)
Select one:
 Isotretinoin for acne
Valproic acid for epilepsy
. Amoxicillin as an antibiotic
Advil (ibuprofen)

Posted 5 years ago by miyaomar in Biology 30 | 1 answers
#advil #umbilical cord #hormones 

Which of the following statements does NOT correctly describe the similarities and differences between male and female reproductive systems?
Select one:
 Eggs and sperm can survive for 3 to 5 days in the Fallopian tubes.
\Millions of mature sperm are produced on a daily basis, whereas single mature ovum is released every 28 days.
 Eggs and sperm contain exactly half of the genetic material of a normal somatic cell. Many zygotes with an abnormal number of genetic material often do not successfully implant.
 Meiosis is completed after fertilization in eggs, whereas a mature sperm has completed meiosis prior to fertilization.
 
 
Which of the following statements correctly identifies the differences between spermicidal jelly and a condom?
Select one:
. Condoms prevent the physical transfer of most sexual secretions. Spermicidal jelly kills sperm, but allows fluid transfer.
Condoms are semipermeable membranes whereas spermicidal jelly does not form any barrier.
. Condoms contain an antibacterial coating while spermicidal jelly only kills sperm cells.
Condoms form a barrier to protect against sperm movement as well as viruses. Spermicidal jelly breaks down cell membranes of bacteria.

Posted 5 years ago by miyaomar in Biology 30 | 1 answers
#sexual #activity #std 

A sample of pure tin metal is dissolved in nitric acid to produce 20.00 mL of solution containing Sn2+.  When this tin solution is titrated, a total of 39.8 mL of 0.140 mol/L KMnO4is required to reach the equivalence point. 

 

b.    What is the concentration of the Sn2+ solution?

Posted 5 years ago by love in Chemistry 30 | 1 answers
#chemistry 30 #electrochemistry #half reactions 

During the first trimester, hCG produced from the chorion maintains the corpus luteum. What is the purpose of maintaining the corpus luteum?
Select one:
 The corpus luteum ensures that the endometrium does not break down during the first trimester.
The corpus luteum supports the formation of the placenta.
The chorion forms the fetal part of the placenta, and the corpus luteum supports the maternal part of the placenta.
 The corpus luteum produces relaxin, which thickens the endometrium.
 
 
How does the human body ensure that another pregnancy does not occur during embryonic and fetal development?
Select one:
High levels of estrogen
 Low levels of oxytocin
Low levels of LH
 High levels of FSH

Posted 5 years ago by miyaomar in Biology 30 | 1 answers
#spinalcord #purpose of maintaining the corpus luteum #sensory pathway 

Which of the following statements is NOT correct about the immunological incompatibility between mother and baby?
Select one:
If the baby is Rh+ and the mother is Rh–, it does not pose a problem as long as this is the mother’s first pregnancy.
The baby’s Rh+ blood will never get in contact with the mother’s Rh– blood during the pregnancy as the placenta does not allow fetal blood cells to mix with the maternal blood.
 When the mother has Rh– blood, anti-Rh antibody injection is given during her pregnancy to prevent any antibodies from forming.
 Rh– blood has no rhesus factor proteins and therefore will produce antibodies for the Rh factor when exposed to Rh+ blood.
 
What is the difference between in vitro fertilization (IVF)and artificial insemination?
Select one:
 During IVF, gametes are introduced into the womb, whereas during artificial insemination, a blastocyst is implanted on the uterus.
 Artificial insemination can be used during a surrogacy, whereas IVF cannot.
IVF includes giving the woman additional FSH and LH to induce superovulation, whereas artificial insemination involves a woman undergoing any hormonal treatment.
 IVF involves fertilization outside the body, whereas artificial insemination involves internal fertilization.

Posted 5 years ago by miyaomar in Biology 30 | 0 answers
#gametes #sperm #sensory pathway 

identify the arithmetic sequences. For

those that are not arithmetic, be sure to indicate why not.

14, 14+p, 14+2p, 14+3p....

Posted 5 years ago by in Math 20-1 | 2 answers
#arithmetic sequences 

X-3 and x+1 are both factors of the polynomial mx3-4x2+nx-6. Determine the values for both m and n.

Posted 5 years ago by steff101 in Math 30-1 | 3 answers
#polynomials 

What structure develops into only the fetus?

Posted 5 years ago by cannie247 in Biology 30 | 0 answers
#embryonic development 

Some couples practice natural family planning (also known as the rhythm method of birth control), which involves abstaining from sexual intercourse during the time that a woman can become pregnant in her menstrual cycle. The egg only survives in the Fallopian tube for 24 hours after ovulation, so conception can only happen during a 24-hour period each month. However, this form of contraception is very unreliable and is not recommended for couples who are actively trying to avoid pregnancy.  
 
Which of the following is NOT a reason why this form of birth control is unreliable?
Select one:
Women always ovulate on the same day of their menstrual cycle every month.
Sperm can survive in the Fallopian tubes for 3 to 5 days.
It is difficult to predict exactly when in her cycle a woman ovulates.
 Ovulation can be affected by stress or illness.
 
 
A gastrulation does NOT
Select one:
consist of endoderm, mesoderm, and ectoderm
include the differentiation of cells into tissues and organs
involve the formation of germ layers
result in the formation of a third layer in the embryonic disk

Posted 5 years ago by miyaomar in Biology 30 | 0 answers
#female reproduction #sensory pathway #receptors 

At the end of the uterine cycle, there is a significant drop in the levels of LH, estrogen, and progesterone.This causes all of the following EXCEPT
Select one:
 an increase in smooth muscle contractions of the uterus
 negative feedback loop to the pituitary to secrete more FSH and LH
the start of menstruation, which breaks down the blood vessels and tissues formed during the follicular stage
the maintenance of the corpus luteum to continue producing low levels of progesterone and estrogen

Posted 5 years ago by miyaomar in Biology 30 | 1 answers
#hormones #menstralcycle #cell division 

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