Look inside the AQA A-Level Biology guide (7402)

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AQA · A-Level · 7402
Biology
Active Recall Guide
1,977 questions
BiologyContents
Contents
8 topics, 155 subtopics
  1. Biological Molecules272
  2. Cells313
  3. Organisms Exchange Substances with Their Environment282
  4. Genetic Information, Variation and Relationships Between Organisms219
  5. Energy Transfers in and Between Organisms195
  6. Organisms Respond to Changes in Their Internal and External Environments350
  7. Genetics, Populations, Evolution and Ecosystems125
  8. The Control of Gene Expression221
ii
CellsQuestions
Cells
Cell-surface membrane, nucleus and mitochondria
  1. What is the primary function of the cell-surface membrane?
  2. Describe the basic structure of the cell-surface membrane.
  3. What two key roles does the nucleus perform in a eukaryotic cell?
  4. What are chromosomes composed of?
  5. How many nucleoli can be present within a nucleus?
  6. What is the function of the nucleolus?
  7. What is the nuclear envelope?
  8. What metabolic processes occur in mitochondria?
  9. Describe the membrane structure of a mitochondrion.
12
CellsAnswers
Answers
Cell-surface membrane, nucleus and mitochondria
  1. It controls the entry and exit of substances into and out of the cell.
  2. It is a partially permeable barrier composed of a phospholipid bilayer with embedded proteins.
  3. It contains the genetic material and controls cell activities.
  4. Linear DNA bound to proteins.
  5. One or more nucleoli.
  6. It is the site of ribosome production.
  7. A double membrane that surrounds the nucleus.
  8. Aerobic respiration and ATP production.
  9. It has a double membrane, with the inner membrane folded into cristae.
13
Genetic Information, Variation and Relationships Between OrganismsQuestions
Genetic Information, Variation and Relationships Between Organisms
DNA in mitochondria and chloroplasts, genes and loci
  1. Which organelle, other than the nucleus, contains its own DNA in animal cells?
  2. Which organelle found in plant cells, besides the nucleus and mitochondria, contains its own DNA?
  3. Describe the length of DNA found in mitochondria and chloroplasts.
  4. What is the shape of DNA in mitochondria and chloroplasts?
  5. Is the DNA in mitochondria and chloroplasts associated with protein?
  6. Why is the DNA in mitochondria and chloroplasts described as similar to prokaryotic DNA?
  7. Define a gene in terms of coding for a polypeptide.
  8. How can a gene be defined when it does not code for a polypeptide?
  9. Name one type of functional RNA encoded by genes that is a component of ribosomes.
34
Genetic Information, Variation and Relationships Between OrganismsAnswers
Answers
DNA in mitochondria and chloroplasts, genes and loci
  1. Mitochondria.
  2. Chloroplasts.
  3. Short.
  4. Circular.
  5. No, it is not associated with protein.
  6. Because it is short, circular and not associated with protein, like prokaryotic DNA.
  7. A base sequence of DNA that codes for the amino acid sequence of a polypeptide.
  8. A base sequence of DNA that codes for a functional RNA.
  9. Ribosomal RNA (rRNA).
35
Genetics, Populations, Evolution and EcosystemsQuestions
Genetics, Populations, Evolution and Ecosystems
Genotype, phenotype and types of allele
  1. What is meant by the term genotype?
  2. Define phenotype.
  3. Is a single gene limited to only two alleles?
  4. What is a dominant allele?
  5. Under what condition is a recessive allele expressed in the phenotype?
  6. What are codominant alleles?
  7. Define homozygous.
  8. What does heterozygous mean?
  9. What is a locus?
56
Genetics, Populations, Evolution and EcosystemsAnswers
Answers
Genotype, phenotype and types of allele
  1. The genetic constitution of an organism.
  2. The expression of the genetic constitution and its interaction with the environment.
  3. No, a single gene may have many alleles.
  4. An allele that is expressed in the phenotype when present in either homozygous or heterozygous form.
  5. Only when present in homozygous form.
  6. Alleles that are both expressed in the phenotype when present together in a heterozygote.
  7. Having two identical alleles at a specific locus.
  8. Having two different alleles at a specific locus.
  9. The specific position of a gene on a chromosome.
57
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155 subtopics

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1,977 questions
Across 155 subtopics, every one of them from specification 7402.
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  1. Step 1 · Closed book

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  2. Step 2 · Open book

    Go back to the top. Read each printed answer and write it out in full, including the ones you had right.

  3. Step 3 · Closed book again

    Same questions, same order, from memory. The gap between pass one and pass three is the session result.

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