Nokea
In the example provided in question 23, which type of solution is the egg placed in?
- A. Hypertonic
- B. Isotonic
- C. Hypotonic
- D. None of the above
Correct Answer: A
Rationale: When an egg is placed in a hypertonic solution, there is a higher concentration of solutes outside the egg compared to inside. This concentration gradient causes water to move out of the egg through osmosis, leading to the egg shrinking or shriveling due to the loss of water. Therefore, the correct answer is 'Hypertonic.'
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Which option demonstrates complementary base pairing in DNA?
- A. A and G
- B. A and C
- C. A and A
- D. A and T
Correct Answer: D
Rationale: In DNA, adenine (A) pairs with thymine (T) and cytosine (C) pairs with guanine (G). This is known as complementary base pairing. Adenine always pairs with thymine via two hydrogen bonds, forming a strong bond essential for DNA structure and replication. Therefore, the correct option that demonstrates complementary base pairing in DNA is A and T (D). This pairing is crucial during DNA replication and ensures the accurate transmission of genetic information.
What process of division do sex cells undergo?
- A. Mitosis.
- B. Binary fission.
- C. Facilitated division.
- D. Melosis.
Correct Answer: D
Rationale: The correct answer is D: Meiosis. Sex cells undergo meiosis, which is a specialized form of cell division that reduces the chromosome number by half to produce gametes (sperm and egg cells). This process involves two rounds of division (meiosis I and II) resulting in four haploid daughter cells.
A: Mitosis is a form of cell division where a cell divides to produce two identical diploid daughter cells, not sex cells.
B: Binary fission is a form of asexual reproduction in prokaryotes, not a process of division for sex cells.
C: Facilitated division is not a recognized term in biology and is not related to the division of sex cells.
Which of the following is a benefit of the intermolecular hydrogen bonding of water? (Select one that doesn't apply.)
- A. Water has a relatively high specific heat value.
- B. Water has strong cohesive and adhesive properties.
- C. Polarity of water allows it to act as a versatile solvent.
- D. Water moves from higher to lower concentrations.
Correct Answer: D
Rationale: Intermolecular hydrogen bonding in water leads to various unique properties. Options A, B, and C are benefits of this bonding. Water's high specific heat value allows it to resist temperature changes, which is advantageous for temperature regulation in organisms. The strong cohesive and adhesive properties of water contribute to capillary action and surface tension, essential in biological systems. Additionally, water's polarity enables it to dissolve a wide range of substances, making it a versatile solvent. Option D, 'Water moves from higher to lower concentrations,' is not a direct benefit of intermolecular hydrogen bonding of water. Instead, it describes the process of osmosis, which is driven by differences in solute concentrations rather than hydrogen bonding.
Which DNA strand would complement this segment: ACTTGCA?
- A. TGAACGT
- B. GACCATG
- C. ACTTGCA
- D. None of the above
Correct Answer: A
Rationale: To find the complementary DNA strand, you need to pair each nucleotide with its complementary base: A with T, C with G, T with A, and G with C. Therefore, the correct match for ACTTGCA is TGAACGT. Only Choice A follows this complementary base pairing rule, making it the correct answer.
If the zygomatic arch is broken, where is the fracture located?
- A. Knee.
- B. Wrist.
- C. Cheek.
- D. Shoulder.
Correct Answer: C
Rationale: