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Solve the equation . Show all work, and verify the solution(s).

$\sqrt{2x-5}-4=-x,x>5\div2$√2x−5−4=−x,‍x>5÷2

Posted 6 years ago by sara in Math 20-1 | 4 answers
#radicals

Phenylthiocarbamide (PTC) is an organic compound that either tastes extremely bitter or is tasteless, depending on the genotype of the taster. The tasting allele is dominant over the non-tasting allele. Normal skin pigmentation is dominant over albinism. (It is important to note that this example of PTC tasting cannot be explained with simple genetics, but for the purpose of this question, assume that it can.) A normally-pigmented woman who cannot taste PTC has an albino father who can taste PTC. The woman married an albino man who can taste PTC and whose mother cannot taste PTC. For the married couple,

correctly identify their genotypes, (1 mark) complete a Punnett square showing the expected offspring of the couple, and (1 mark) identify the genotypic and phenotypic ratios of their offspring (1 mark)

Posted 6 years ago by cannie247 in Biology 30 | 0 answers
#genetics and probability

Is 4x² + 8x + 12 factorable?

If so how can I tell whether it is or not?

Posted 6 years ago by in Math 20-1 | 3 answers
#quadratic functions

Which of the following statements clearly describes the difference between embryonic and fetal development?

Select one:

Embryonic development begins during the tenth week of gestation, a time of morphogenesis.. Organs continue to grow and develop during embryonic development.

Organs continue to grow and develop during fetal development.

Fetal development begins during the ninth month of gestation, a time of rapid growth.

Which description below explains how the hormones released in birth control pills causes natural ovulation to cease?

Select one:

Birth control pills release progesterone. Progesterone feeds back to the pituitary gland, thereby inhibiting FSH and LH and in effect, stopping the ovarian and menstrual cycle.

Birth control pills release estrogen. Estrogen feeds back to the posterior pituitary, causing an increase of LH and thereby ceasing the ovarian cycle.

Birth control pills release progesterone. Progesterone causes an increase in FSH, thereby increasing the production of follicles.

Birth control pills release estrogen. Estrogen controls the secondary sex characteristics of the female body.

Posted 6 years ago by miyaomar in Biology 30 | 1 answers
#estrogen #hormones #embryonic development

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 6 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 6 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 6 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