Answer:
cells consists of cytoplasm enclosed within a membrane, which contains many biomolecules such as protiens and nucleic acids.
A)The dark coloured feathers reflect heat from the sun
B)Their webbed feet make them powerful swimmers
C)They have overlapping feathers to waterproof them
D)They have thick skin and lots of fat to keep them warm
Answer:
B their webbed feet make them powerful swimmers
B) thyroid hormone
C) testosterone
D) parathyroid hormone
E) acetylcholine
Answer:
The correct answer will be option-E.
Explanation:
Acetylcholine belongs to a group of chemical messengers which also acts as neurotransmitters in the synaptic transmission of the signals.
The acetylcholine is present in the vesicles in the synaptic knob which when released at the neuromuscular junction cause the contraction of the skeletal muscle along with cardiac and smooth muscle.
The mechanism of action is different in different muscles as the neurotransmitter binds to the nicotinic receptors present on the motor endplate and opens ligand-gated sodium channels.
In smooth and cardiac muscle it binds to the muscarinic receptors and cause the release of calcium ions and potassium ions respectively and cause muscle contraction.
Thus, option-E is the correct answer.
Answer:
C.) tool making.
Explanation:
Answer:
c
Explanation:
b. plants would not be able to grow due to lack of nitrogen.
c. bioremediation would have limited use as a tool to clean up pollutants. .
d. there would be a shortage of decomposer organisms.
e. All of the choices are correct.
Answer:
e. All of the choices are correct.
Explanation:
Bacteria are present almost everywhere on Earth. Many bacteria like cyanobacteria play an important role in fixing the atmospheric carbon in the form of an organic molecule. These organic molecules then used to gain energy.
Many nitrogen-fixing bacteria like Rhizobium, Azotobacter, etc plays an important role in providing nitrogen to plants which is important for their growth. Many bacteria decompose organic matter into simpler form and recycle the nutrients present in them.
So bacteria like Pseudomonas putida decompose waste and clean the environment, therefore, they also help in bioremediation. So the correct answer is e. All of the choices are correct.
Answer: e. All of the choices are correct.
Explanation: Bacteria is an important part of the ecosystem. There are some bacterial species which we called (biological nitrogen fixation (BNF). These bacteria fixes atmospheric nitrogen for higher plants. There are some other bacterial species which feed on dead bodies of living material and helps in cleaning the environment. Due to this decomposition process high amount of carbon is liberated in the atmosphere and used by the plants during photosynthesis.
b) false
Answer:
true
Explanation:
Because it adapts to the repoducting organism