Nokea
Which of the following is an example of ovoviviparity?
- A. Honeybees lay soft eggs within the hive
- B. Sharks hatch from shell-covered fertilized eggs within the female's body.
- C. Birds hatch from shell covered fertilized eggs laid within a nest.
- D. Fetal mammals obtain nourishment from the mother through a placent
Correct Answer: C
Rationale: Ovoviviparity is a reproductive strategy where fertilized eggs develop within the female's body but are not nourished by the mother. Choice C is correct because birds lay fertilized eggs within a nest where they hatch, indicating the eggs were developed internally. Choice A is incorrect as honeybees do not exhibit ovoviviparity. Choice B is incorrect as sharks exhibit viviparity, where embryos develop inside the mother but are nourished directly. Choice D is incorrect as it describes placental nourishment in mammals, which is not characteristic of ovoviviparity.
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You are working in the ED when a client with possible toxic shock syndrome (TSS) is admitted. The physician has given all of these orders. Which one will you implement first?
- A. Remove client's tampon.
- B. Obtain blood cultures from two sites.
- C. Give O2 at 6 L/minute.
- D. Infuse nafcillin (Unipen) 500 mg IV.
Correct Answer: A
Rationale: Removing the tampon eliminates the source of infection, which is critical in managing TSS.
If a cell has 92 chromosomes at the beginning of mitosis, determine the number of chromatids at
- A. 23 chromatids
- B. 92 chromatids
- C. 46 chromatids
- D. 184 chromatids
Correct Answer: C
Rationale: The correct answer is C: 46 chromatids. At the beginning of mitosis, each chromosome consists of two sister chromatids. Since the cell has 92 chromosomes, the total number of chromatids will be 92 chromosomes x 2 chromatids per chromosome = 184 chromatids. However, this number represents the total number of chromatids, not the number at the beginning of mitosis. At the beginning of mitosis, the sister chromatids are still attached, so we need to divide the total number of chromatids by 2 to get the number at the beginning of mitosis, which is 184 chromatids / 2 = 92 chromatids. Therefore, the correct answer is 46 chromatids, as each chromosome consists of two chromatids at the beginning of mitosis. Choices A, B, and D are incorrect as they do not consider the concept of sister chromatids in chromosomes during mitosis.
Women infected with human papilloma virus (HPV) are at risk for which of the following?
- A. Uterine fibroids
- B. Cervical cancer
- C. Ovarian cysts
- D. Hemorrhagic
Correct Answer: B
Rationale: HPV infection is a significant risk factor for developing cervical cancer.
Cowper's gland is another name for:
- A. Prostate gland
- B. Testes
- C. Bulbourethral glands
- D. Preputial glands
Correct Answer: C
Rationale: The correct answer is C: Bulbourethral glands. Cowper's gland is another name for the bulbourethral glands, which are responsible for producing a lubricating fluid that helps neutralize acidity in the urethra before ejaculation. The prostate gland (A) is responsible for producing seminal fluid, the testes (B) are responsible for producing sperm, and the preputial glands (D) are glands found in the foreskin of the penis. Therefore, the bulbourethral glands (C) are the correct answer because they align with the function and location of Cowper's gland.
Ovulation is initiated by
- A. rising levels of follicle stimulating hormone
- B. rising levels of progesterone
- C. a drop in oestrogen levels
- D. rising levels of luteinizing hormone
Correct Answer: D
Rationale: The correct answer is D: rising levels of luteinizing hormone. Luteinizing hormone surge triggers ovulation by stimulating the release of the mature egg from the ovary. This surge is a crucial event in the menstrual cycle. A: Follicle stimulating hormone is involved in follicular development, not ovulation. B: Progesterone levels rise after ovulation, not before. C: Oestrogen levels actually rise before ovulation to trigger the LH surge, so a drop in oestrogen levels would not initiate ovulation.