Nokea
The structure of a bacteria is circular. Which bacteria fits this criteria?
- A. Mycobacterium.
- B. Actinomyces.
- C. Clostridium.
- D. Neisseria.
Correct Answer: C
Rationale: Rationale:
1. The correct answer is C: Clostridium.
2. Clostridium is a type of bacteria that has a circular structure known as a plasmid.
3. Plasmids are small, circular DNA molecules found in bacteria.
4. Mycobacterium (A) has a rod-shaped structure with a linear chromosome.
5. Actinomyces (B) has a filamentous structure, not circular.
6. Neisseria (D) has a diplococci shape, not circular.
In summary, Clostridium fits the criteria of having a circular structure due to its plasmid, making it the correct choice.
You may also like to solve these questions
Which organelle is responsible for protein synthesis?
- A. Ribosome
- B. Chloroplast
- C. Lysosome
- D. Mitochondria
Correct Answer: A
Rationale: The correct answer is A, Ribosome. Ribosomes are the organelles responsible for protein synthesis in a cell. They are the site where amino acids are assembled into proteins based on the genetic information carried by mRNA. Chloroplasts are responsible for photosynthesis in plant cells, Lysosomes contain enzymes for digestion and waste removal, and Mitochondria are known as the powerhouse of the cell, responsible for generating energy.
In a Punnett square, a capital letter represents what type of allele?
- A. Dominant.
- B. Ryeesive.
- C. Homozygous.
- D. Heterozygous.
Correct Answer: A
Rationale: Correct Answer: A: Dominant.
Rationale:
1. In a Punnett square, capital letters denote dominant alleles.
2. Dominant alleles are expressed in the phenotype over recessive alleles.
3. This representation helps predict the possible offspring genotypes.
4. Choice B is incorrect as it's a misspelling of 'Recessive.'
5. Choices C and D refer to genotype combinations, not allele types.
Summary:
The capital letter in a Punnett square signifies a dominant allele that will be expressed in the offspring's phenotype. This helps in predicting genetic outcomes accurately.
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.
Which antioxidant is identified as a healing vitamin?
- A. A
- B. D.
- C. K
- D. E
Correct Answer: D
Rationale:
AIDS is caused by what type of infectious agent?
- A. Protist.
- B. Bacterium.
- C. Insect.
- D. Virus.
Correct Answer: D
Rationale: The correct answer is D: Virus. AIDS is caused by the Human Immunodeficiency Virus (HIV), which attacks the immune system and weakens the body's ability to fight infections. Viruses are unique infectious agents that require a host cell to replicate and cause disease, which is the case with HIV.
A: Protists are eukaryotic organisms like parasites, but they are not known to cause AIDS.
B: Bacteria are prokaryotic organisms that can cause various infections, but they do not cause AIDS.
C: Insects are not infectious agents themselves but can transmit diseases, they do not cause AIDS.
In summary, the correct answer is D because HIV, a virus, specifically causes AIDS by targeting and damaging the immune system.