Worksheetsap bio review
Total questions: 26
Worksheet time: 19mins
Which are classified as a purine?
Adenine and Guanine
Thymine and Cytosine
What is a peptide bond? (1pt)
Bond that holds two amino acids together
A bond that holds hydrogen and oxygen molecules togethe
A bond that holds the phosphate group of one nucleotide and a sugar of a neighboring nucleotide
A bond that is formed by the sharing of electrons.
Which of the following word pairs correctly completes the sentence below?
_______ are corrosive substances characterized as having a strong smell, a sour taste, and a _______. (1pt)
Acids; pH less than 7
Acids; pH greater than 7
Bases; pH greater than 7
Bases; pH less than 7
What causes trophic cascades?
Increasing the number of producers
Pollution
The removal of a keystone species
Introducing a new species to an ecosystem
Why does increasing producers increase the populations of all trophic levels?
Producers increase the size of a habitat
Producers help keep predator populations in check
With more energy available the carrying capacity increases
Producers do not have a large impact on population sizes
What are limiting factors?
The maximum number of organisms an area can sustain
Scarce resources that limit the size of a population
Conditions that limit how much energy flows to the next trophic level
How diverse the populations of a community are
Frogs lay ~4000 eggs at a time. Based on this frogs would be classified as -
R-strategists
K-strategists
Which of the following would be a density independent limiting factor?
A virus spreading through a population
A forest fire burning down a forest
Birds competing for a limited amount of seeds
A new predator moving to an area
Which of these describes a mutualistic relationship?
When one organism is harmed, but the other is benefitted
When one organism is unaffected, and the other is harmed
When one organism benefits, and the other is unaffected
When both organisms involved benefit
What will happen if two species occupy the same niche in an ecosystem?
The ecosystem will be stressed and could collapse
One species will either alter their niche or be eliminated
The niche will expand to accommodate both species
The species will share the niche
How does competition affect population?
Most populations do not have competition
It maximizes the carrying capacity of an ecosystem
It limits population sizes and drives natural selection
It benefits both species and increases their populations
Why are decomposers necessary in ecosystems?
They recycle essential nutrients back down to producers
They enrich soil with nitrogen
They help keep ecosystems clean
All of the above
