Nokea
When the genotype consists of a dominant and a recessive allele, the phenotype will be like the....................allele.
- A. Dominant
- B. Recessive
- C. Both
- D. Neither
Correct Answer: A
Rationale: When an individual possesses a genotype with both a dominant and a recessive allele, the dominant allele will dictate the phenotype. Dominant alleles are expressed over recessive alleles in heterozygous individuals, leading to the phenotype resembling the dominant allele's characteristics.
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Cells reproduce by different processes, all of which fall into what two categories?
- A. Sexual reproduction and binary fission
- B. Sexual reproduction and asexual reproduction
- C. Asexual reproduction and binary fission
- D. Asexual reproduction and mitosis
Correct Answer: B
Rationale: Cells can reproduce through sexual reproduction, involving the fusion of gametes, and asexual reproduction, which does not involve the fusion of gametes. Binary fission is a specific type of asexual reproduction where a cell divides into two identical cells. Therefore, the correct answer is B as it encompasses the broad categories of cellular reproduction processes, covering both sexual and asexual reproduction.
Why can animal cells use a contractile ring but plant cells cannot?
- A. Plant cells can divide using both methods.
- B. Animal cells divide faster, requiring them to pinch apart.
- C. Plant cells are too rigid to utilize a contractile ring.
- D. Plant cells have a cell wall that hinders the formation of a contractile ring.
Correct Answer: D
Rationale: The correct answer is D because plant cells have a cell wall surrounding them, which provides structural support but makes it challenging for them to form a contractile ring during cell division. The cell wall restricts the flexibility needed for the contractile ring to constrict and separate the cells. In contrast, animal cells do not have a cell wall, allowing them to form a contractile ring composed of actin filaments that constrict during cytokinesis, facilitating cell division.
Select the two bases that are purines:
- A. A
- B. C
- C. T
- D. N
Correct Answer: A
Rationale: Purines are adenine (A) and guanine (G), which are the larger nitrogenous bases found in DNA and RNA. Adenine (A) is one of the purine bases, whereas cytosine (C) and thymine (T) are pyrimidines. Therefore, the correct answer is A. Option D, 'N,' is not a purine base.
Aerobic respiration occurs in the presence of what necessary molecule?
- A. Carbon Dioxide
- B. Water
- C. Glucose
- D. Oxygen
Correct Answer: D
Rationale: Oxygen is essential for aerobic respiration as it acts as the final electron acceptor in the electron transport chain, producing ATP
What is the term for movement of water across a cellular membrane?
- A. Osmosis.
- B. Facilitated diffusion.
- C. Diffusion.
- D. Active transport.
Correct Answer: A
Rationale: Correct Answer: A - Osmosis
Rationale:
1. Osmosis is the movement of water across a selectively permeable membrane from an area of low solute concentration to high solute concentration.
2. Water moves passively to equalize solute concentrations on both sides of the membrane.
3. Facilitated diffusion (B) involves the use of transport proteins, not specific to water movement.
4. Diffusion (C) is the movement of solutes, not specific to water.
5. Active transport (D) requires energy to move molecules against their concentration gradient, different from osmosis.