Biology Mixed Test
Moderate level biology test covering photosynthesis, cell biology, genetics, evolution, and plant/animal biology for medical students preparing for exams.
Questions
How is photosynthesis similar in C4 and CAM plants?
- In both pathways, only photosystem I is used.
- Both types of plants make sugar without Calvin cycle.
- In both cases, RUBISCO is not used to fix carbon initially.
- Both types of plants make most of their sugar in the dark.
- In both cases. thylakoids are not involved in photosynthesis.
Protists and bacteria are grouped into two different domains because
- protists eat bacteria
- protists have a membrane-bounded nucleus which bacterial cells lack
- bacteria decompose protists
- protists are photosynthetic, while bacteria are not
- None of these
Which of the following processes is most directly driven by light energy?
- Creation of a pH gradient by pumping protons across thethylakoid membrane
- Carbon fixation in the stroma
- Reduction of NADP molecules
- Removal of electrons from chlorophyll molecules
- ATP synthesis
A human cell containing 22 autosomes and a Y-chromosome is
- a sperm
- an egg
- zygote
- a somatic cell of a male
- a somatic cell of a female
Which process is most directly driven by light energy?
- Creation of a pH gradient by pumping protons across thethylakoid membrane
- Carbon fixation in the stroma
- Reduction of NADP-molecules
- Removal of electrons from chlorophyll molecules
- ATP synthesis
A human cell containing 22 autosomes and a X-chromosome is
- a sperm
- an egg
- an egg or a sperm
- a somatic cell of male
- a somatic cell of female
Why are plants more readily manipulated by genetic engineering than animals?
- Plant genes do not contain introns.
- More vectors are available for transferring recombinant DNA into plant cells.
- A somatic plant cell can often give rise to a complete plant.
- Genes can be inserted into plant cells by microinjection.
- Plant cells have larger nuclei.
Which of the following life cycle stages is found in plants, but not in animals?
- Gamete
- Zygote
- Multicellular diploid
- Multicellular haploid
- Unicellular diploid
If the DNA content of a diploid cell in the G1 phase of the cell cycle is x, then the DNA content of the same cell at metaphase of meiosis I would be
- 0.25x
- 0.5x
- x
- 4x
- 2x
Bats and whales are classified as mammals because both
- have four-chambered heart
- give birth to young ones
- have pinna in their ears
- are endothermic in nature
- None of these
Polytypic species are those which
- do not interbreed
- are distributed in different geographical areas
- have two or more subspecies
- belong to different time periods
- belong to the same time period
Which of the following disorders shows criss-cross inheritance?
- Haemophilia
- Night blindness
- Erythroblastosis foetalis
- Baldness
- None of these
Which of the following processes includes all the others?
- Osmosis
- Diffusion of a solute across a membrane
- Facilitated diffusion
- Passive transport
- Transport of an ion
___________ demonstrate(s) the unity among all organisms.
- The structure and function of DNA
- Natural selection
- Descent with modification
- Matching of DNA nucleotide sequences
- None of these
Down’s syndrome is caused by an extra copy of chromosome number 21. What percentage of offsprings produced by an affected mother and a normal father would be affected by this disorder?
- 15%
- 25%
- 75%
- 100%
- 50%