A2 Unit 2 (OCR) Test One

I made this to help me revise, hopefully it will help any other OCR Biology A2 students. This includes ALL units, but not all topics. You should probably use this to find out what pages in particular you need help with. OCR focus on keywords a lot, so that's the focus of this quiz. Have fun, good luck! MJ 

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  • Created by: MJ
  • Created on: 18-05-13 19:49
What is a gene?
A length of DNA that codes for an amino acid.
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An ecosystem is:
Abiotic and biotic factors occurring in a group and the relationships between them.
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Succession is:
The directional change of a community over time, caused by an environmental change.
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What are muscle filaments made of?
A thick filament myosin and a thin filament, actin.
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Match this definition to its word: Fibres that are capable of stimulating contraction without a nerve impulse.
Myogenic
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When animals learn to ignore a stimulus because it gains them neither a reward, or a punishment, their behavior can be described as...
Habituation
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How does imprinting help young animals?
It enables them to be associated with an older animal, so they can learn appropriate skills.
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What is a plasmid?
A circular piece of DNA.
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What do "maternal effect" homebox genes control?
The polarity of the embryo.
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In Meosis, when does "crossing over" occur?
Prophase 1
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What is nitrification?
The absorbing of ammonium ions by chemoautrophic bacteria.
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What are DNA probes?
Short single strands of DNA that are complementary to investigated DNA.
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How are they labelled?
Either with a radioactive marker or a florescent marker.
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How is DNA charged?
Negatively, due to many phosphoryl groups.
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A monophyletic group is...
A taxonomic group of an ancestral organism and its descendant species.
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A frameshift is...
When an insertion/deletion of a nucleotide pair causes the reading of codons to be incorrect.
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What is the "lag phase" in regards of population growth?
When a few individuals are acclimitising to their habitat. Reproduction rates are low, as is growth.
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The log phase?
The population is rapidly growing; resources are plentiful; conditions are good.
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The stationary phase?
Reproduction rate is equal to the mortality rate. The population is at its carrying capacity.
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Speaking of the "carrying capacity"... what is it?
The maximum population a habitat can support due to limiting factors.
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The synovial fluid is a
Lubricant.
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What is "Apoptosis"?
Programmed cell death in multicelluar organisms.
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The Lac Operon - When lactose is absent, what gene is expressed?
I (Regulatory)
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What are the structural genes?
Z + Y
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What is coppicing?
The cutting of decidious trees close to the ground; new shoots grow with a small diameter, initially.
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What is the peripheral nervous system?
The sensory and motor neurones that carry impulses in and out of the central nervous system.
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The sensory neurones of the peripheral nervous system...
Carry impulses from receptors to the CNS.
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The somatic motor neurones...
Carry impulses from the CNS to skeletal, voluntary muscles.
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Whilst the autonomic neurones...
Carry impulses from the CNS to involuntary muscles.
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The involuntary muscles include:
Cardiac, Smooth and glands.
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What is Apesis?
The absence of unwanted organisms.
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_______ metabolites are part of an organism's normal growth.
Primary
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Other cards in this set

Card 2

Front

An ecosystem is:

Back

Abiotic and biotic factors occurring in a group and the relationships between them.

Card 3

Front

Succession is:

Back

Preview of the front of card 3

Card 4

Front

What are muscle filaments made of?

Back

Preview of the front of card 4

Card 5

Front

Match this definition to its word: Fibres that are capable of stimulating contraction without a nerve impulse.

Back

Preview of the front of card 5
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